Java abstract class & abstract methods,Abstract class in java
Abstract classes are classes that contain one or more abstract methods. An abstract method is a method that is declared, but contains no implementation. Abstract classes may not be instantiated, and require subclasses to provide implementations for the abstract methods.
This document discusses classes, objects, and methods in Java. It defines a class as a user-defined data type that contains fields and methods. Objects are instances of classes that allocate memory at runtime. Methods define behaviors for objects and are declared within classes. The document covers defining classes, creating objects, accessing members, constructors, method overloading and overriding, static members, passing objects as parameters, recursion, and visibility control.
This document discusses inheritance in object-oriented programming. It defines inheritance as establishing a link between classes that allows sharing and accessing properties. There are three types of inheritance: single, multilevel, and hierarchical. Single inheritance involves one parent and one child class, multilevel inheritance adds intermediate classes, and hierarchical inheritance has one parent and multiple child classes. The document provides examples of inheritance code in Java and demonstrates a program using inheritance with interfaces. It notes some limitations of inheritance in Java.
Abstract classes allow for incomplete implementations and common functionality to be shared among subclasses, interfaces define a contract for methods without implementations, and both are useful for abstraction and polymorphism by defining types independently of their concrete implementations.
Inheritance in java is a mechanism in which one object acquires all the properties and behaviors of parent object. The idea behind inheritance in java is that you can create new classes that are built upon existing classes.
Abstract Class & Abstract Method in Core JavaMOHIT AGARWAL
This document discusses abstract classes in Java. It defines an abstract class as a class declared with the abstract keyword that may contain abstract and non-abstract methods. Abstract classes cannot be instantiated and require subclasses to implement any abstract methods. The document provides examples of abstract class and method declarations and demonstrates how subclasses must implement abstract methods to be instantiated. It also outlines some key uses of abstract classes such as code sharing among related classes.
This document discusses polymorphism and inheritance concepts in Java. It defines polymorphism as an object taking on many forms, and describes method overloading and overriding. Method overloading allows classes to have multiple methods with the same name but different parameters. Method overriding allows subclasses to provide a specific implementation of a method in the parent class. The document also discusses abstract classes and interfaces for abstraction in Java, and explains access modifiers like public, private, protected, and default.
Java abstract class & abstract methods,Abstract class in java
Abstract classes are classes that contain one or more abstract methods. An abstract method is a method that is declared, but contains no implementation. Abstract classes may not be instantiated, and require subclasses to provide implementations for the abstract methods.
This document discusses classes, objects, and methods in Java. It defines a class as a user-defined data type that contains fields and methods. Objects are instances of classes that allocate memory at runtime. Methods define behaviors for objects and are declared within classes. The document covers defining classes, creating objects, accessing members, constructors, method overloading and overriding, static members, passing objects as parameters, recursion, and visibility control.
This document discusses inheritance in object-oriented programming. It defines inheritance as establishing a link between classes that allows sharing and accessing properties. There are three types of inheritance: single, multilevel, and hierarchical. Single inheritance involves one parent and one child class, multilevel inheritance adds intermediate classes, and hierarchical inheritance has one parent and multiple child classes. The document provides examples of inheritance code in Java and demonstrates a program using inheritance with interfaces. It notes some limitations of inheritance in Java.
Abstract classes allow for incomplete implementations and common functionality to be shared among subclasses, interfaces define a contract for methods without implementations, and both are useful for abstraction and polymorphism by defining types independently of their concrete implementations.
Inheritance in java is a mechanism in which one object acquires all the properties and behaviors of parent object. The idea behind inheritance in java is that you can create new classes that are built upon existing classes.
Abstract Class & Abstract Method in Core JavaMOHIT AGARWAL
This document discusses abstract classes in Java. It defines an abstract class as a class declared with the abstract keyword that may contain abstract and non-abstract methods. Abstract classes cannot be instantiated and require subclasses to implement any abstract methods. The document provides examples of abstract class and method declarations and demonstrates how subclasses must implement abstract methods to be instantiated. It also outlines some key uses of abstract classes such as code sharing among related classes.
This document discusses polymorphism and inheritance concepts in Java. It defines polymorphism as an object taking on many forms, and describes method overloading and overriding. Method overloading allows classes to have multiple methods with the same name but different parameters. Method overriding allows subclasses to provide a specific implementation of a method in the parent class. The document also discusses abstract classes and interfaces for abstraction in Java, and explains access modifiers like public, private, protected, and default.
Abstract classes and interfaces allow for abstraction and polymorphism in object-oriented design. Abstract classes can contain both abstract and concrete methods, while interfaces only contain abstract methods. Abstract classes are used to provide a common definition for subclasses through inheritance, while interfaces define a contract for implementing classes to follow. Both increase complexity, so their use should provide clear benefits to functionality.
This document discusses implementation of inheritance in Java and C#. It covers key inheritance concepts like simple, multilevel, and hierarchical inheritance. It provides examples of inheritance in Java using keywords like extends, super, this. Interfaces are discussed as a way to achieve multiple inheritance in Java. The document also discusses implementation of inheritance in C# using concepts like calling base class constructors and defining virtual methods.
This presentation introduces Java packages, including system packages that are part of the Java API and user-defined packages. It discusses how packages organize related classes and interfaces, the structure of package names and directories, and how to create and access packages. Packages provide advantages like grouping related code, preventing name collisions, and improving reusability.
Packages in Java allow grouping of related classes and interfaces to avoid naming collisions. Some key points about packages include:
- Packages allow for code reusability and easy location of files. The Java API uses packages to organize core classes.
- Custom packages can be created by specifying the package name at the beginning of a Java file. The class files are then compiled to the corresponding directory structure.
- The import statement and fully qualified names can be used to access classes from other packages. The classpath variable specifies locations of package directories and classes.
The document discusses key concepts of object-oriented programming including objects, classes, inheritance, polymorphism, encapsulation, and abstraction. It provides examples of constructors, method overloading and overriding, interfaces, and packages in Java.
The final keyword in Java can be applied to variables, methods, and classes. It restricts changes to final entities. Final variables must be initialized after declaration and their values cannot be changed. Final methods cannot be overridden in subclasses. Final classes cannot be subclassed. Blank final variables are not initialized in their declaration and can only be initialized in a constructor or static block.
This document discusses interfaces in Java. It defines an interface as a blueprint of a class that defines static constants and abstract methods. Interfaces are used to achieve abstraction and multiple inheritance in Java. They represent an "is-a" relationship. There are three main reasons to use interfaces - for abstraction, to support multiple inheritance functionality, and to achieve loose coupling. The document provides examples of interfaces, such as a Printable interface and implementations in different classes. It also demonstrates multiple inheritance using interfaces and interface inheritance.
This document provides an overview of object-oriented programming concepts in Java including inheritance, polymorphism, abstraction, and encapsulation. It also discusses control structures like if/else statements and switches as well as repetition structures like while, do-while, and for loops. Arithmetic operations in Java like addition, subtraction, multiplication, and division are also mentioned.
The document discusses key concepts in object-oriented programming including objects, classes, messages, and requirements for object-oriented languages. An object is a bundle of related variables and methods that can model real-world things. A class defines common variables and methods for objects of a certain kind. Objects communicate by sending messages to each other specifying a method name and parameters. For a language to be object-oriented, it must support encapsulation, inheritance, and dynamic binding.
This document provides an overview of basic object-oriented programming (OOP) concepts including objects, classes, inheritance, polymorphism, encapsulation, and data abstraction. It defines objects as entities with both data (characteristics) and behavior (operations). Classes are blueprints that are used to create objects. Inheritance allows objects to inherit properties from parent classes. Polymorphism allows code to take different forms. Encapsulation wraps data and functions into classes, hiding information. Data abstraction focuses on important descriptions without details.
The document discusses looping statements in Java, including while, do-while, and for loops. It provides the syntax for each loop and explains their logic and flow. While and for loops check a condition before each iteration of the loop body. Do-while loops check the condition after executing the body at least once. Nested loops run the inner loop fully for each iteration of the outer loop. Infinite loops occur if the condition is never made false, causing the program to run indefinitely.
This is the presentation file about inheritance in java. You can learn details about inheritance and method overriding in inheritance in java. I think it's can help your. Thank you.
This document discusses exception handling in Java. It defines an exception as an event that disrupts normal program flow, such as an error. Exceptions are represented by objects that describe the error condition. The document explains Java's exception hierarchy with Throwable at the root and Exception and Error as subclasses. It covers exception handling keywords like try, catch, throw, throws and finally. It provides examples of exception handling code and describes how to define custom exception classes by subclassing Exception.
This document discusses exception handling in Java. It defines exceptions as abnormal conditions that disrupt normal program flow. Exception handling allows programs to gracefully handle runtime errors. The key aspects covered include the exception hierarchy, try-catch-finally syntax, checked and unchecked exceptions, and creating user-defined exceptions.
Inheritance allows one class to inherit properties and behaviors from another base class. There are two main types of inheritance: implementation inheritance, where a derived class takes on all members of the base class; and interface inheritance, where a derived class inherits only function signatures without implementations. Key aspects of inheritance in C# include defining virtual methods that can be overridden, using modifiers like sealed to restrict inheritance, and implementing interfaces that define common behaviors without implementations.
The document discusses the structure of a Java program. A Java program contains classes, with one class containing a main method that acts as the starting point. Classes contain data members and methods that operate on the data. Methods contain declarations and executable statements. The structure also includes sections for documentation, package statements, import statements, interface statements, and class definitions, with the main method class being essential.
An abstract class is a class that is declared abstract —it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed. When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class.
The document discusses classes and methods in Java. It defines classes as containing data declarations (instance variables) and method declarations. Methods group statements to perform well-defined tasks. Method declarations specify the name, return type, and parameters. The method body contains the statements. Methods can call other methods and control program flow. Overloading allows multiple methods with the same name but different parameters. Variables have either class or block scope depending on where they are declared. Parameters are passed by value for primitives and by reference for objects. The document provides an example Month class to demonstrate these concepts.
This document provides an overview of basic Java programming concepts including:
- Java programs require a main method inside a class and use print statements for output.
- Java has primitive data types like int and double as well as objects. Variables are declared with a type.
- Control structures like if/else and for loops work similarly to other languages. Methods can call themselves recursively.
- Basic input is done through dialog boxes and output through print statements. Formatting is available.
- Arrays are objects that store multiple values of a single type and know their own length. Strings are immutable character arrays.
Abstract classes and interfaces allow for abstraction and polymorphism in object-oriented design. Abstract classes can contain both abstract and concrete methods, while interfaces only contain abstract methods. Abstract classes are used to provide a common definition for subclasses through inheritance, while interfaces define a contract for implementing classes to follow. Both increase complexity, so their use should provide clear benefits to functionality.
This document discusses implementation of inheritance in Java and C#. It covers key inheritance concepts like simple, multilevel, and hierarchical inheritance. It provides examples of inheritance in Java using keywords like extends, super, this. Interfaces are discussed as a way to achieve multiple inheritance in Java. The document also discusses implementation of inheritance in C# using concepts like calling base class constructors and defining virtual methods.
This presentation introduces Java packages, including system packages that are part of the Java API and user-defined packages. It discusses how packages organize related classes and interfaces, the structure of package names and directories, and how to create and access packages. Packages provide advantages like grouping related code, preventing name collisions, and improving reusability.
Packages in Java allow grouping of related classes and interfaces to avoid naming collisions. Some key points about packages include:
- Packages allow for code reusability and easy location of files. The Java API uses packages to organize core classes.
- Custom packages can be created by specifying the package name at the beginning of a Java file. The class files are then compiled to the corresponding directory structure.
- The import statement and fully qualified names can be used to access classes from other packages. The classpath variable specifies locations of package directories and classes.
The document discusses key concepts of object-oriented programming including objects, classes, inheritance, polymorphism, encapsulation, and abstraction. It provides examples of constructors, method overloading and overriding, interfaces, and packages in Java.
The final keyword in Java can be applied to variables, methods, and classes. It restricts changes to final entities. Final variables must be initialized after declaration and their values cannot be changed. Final methods cannot be overridden in subclasses. Final classes cannot be subclassed. Blank final variables are not initialized in their declaration and can only be initialized in a constructor or static block.
This document discusses interfaces in Java. It defines an interface as a blueprint of a class that defines static constants and abstract methods. Interfaces are used to achieve abstraction and multiple inheritance in Java. They represent an "is-a" relationship. There are three main reasons to use interfaces - for abstraction, to support multiple inheritance functionality, and to achieve loose coupling. The document provides examples of interfaces, such as a Printable interface and implementations in different classes. It also demonstrates multiple inheritance using interfaces and interface inheritance.
This document provides an overview of object-oriented programming concepts in Java including inheritance, polymorphism, abstraction, and encapsulation. It also discusses control structures like if/else statements and switches as well as repetition structures like while, do-while, and for loops. Arithmetic operations in Java like addition, subtraction, multiplication, and division are also mentioned.
The document discusses key concepts in object-oriented programming including objects, classes, messages, and requirements for object-oriented languages. An object is a bundle of related variables and methods that can model real-world things. A class defines common variables and methods for objects of a certain kind. Objects communicate by sending messages to each other specifying a method name and parameters. For a language to be object-oriented, it must support encapsulation, inheritance, and dynamic binding.
This document provides an overview of basic object-oriented programming (OOP) concepts including objects, classes, inheritance, polymorphism, encapsulation, and data abstraction. It defines objects as entities with both data (characteristics) and behavior (operations). Classes are blueprints that are used to create objects. Inheritance allows objects to inherit properties from parent classes. Polymorphism allows code to take different forms. Encapsulation wraps data and functions into classes, hiding information. Data abstraction focuses on important descriptions without details.
The document discusses looping statements in Java, including while, do-while, and for loops. It provides the syntax for each loop and explains their logic and flow. While and for loops check a condition before each iteration of the loop body. Do-while loops check the condition after executing the body at least once. Nested loops run the inner loop fully for each iteration of the outer loop. Infinite loops occur if the condition is never made false, causing the program to run indefinitely.
This is the presentation file about inheritance in java. You can learn details about inheritance and method overriding in inheritance in java. I think it's can help your. Thank you.
This document discusses exception handling in Java. It defines an exception as an event that disrupts normal program flow, such as an error. Exceptions are represented by objects that describe the error condition. The document explains Java's exception hierarchy with Throwable at the root and Exception and Error as subclasses. It covers exception handling keywords like try, catch, throw, throws and finally. It provides examples of exception handling code and describes how to define custom exception classes by subclassing Exception.
This document discusses exception handling in Java. It defines exceptions as abnormal conditions that disrupt normal program flow. Exception handling allows programs to gracefully handle runtime errors. The key aspects covered include the exception hierarchy, try-catch-finally syntax, checked and unchecked exceptions, and creating user-defined exceptions.
Inheritance allows one class to inherit properties and behaviors from another base class. There are two main types of inheritance: implementation inheritance, where a derived class takes on all members of the base class; and interface inheritance, where a derived class inherits only function signatures without implementations. Key aspects of inheritance in C# include defining virtual methods that can be overridden, using modifiers like sealed to restrict inheritance, and implementing interfaces that define common behaviors without implementations.
The document discusses the structure of a Java program. A Java program contains classes, with one class containing a main method that acts as the starting point. Classes contain data members and methods that operate on the data. Methods contain declarations and executable statements. The structure also includes sections for documentation, package statements, import statements, interface statements, and class definitions, with the main method class being essential.
An abstract class is a class that is declared abstract —it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed. When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class.
The document discusses classes and methods in Java. It defines classes as containing data declarations (instance variables) and method declarations. Methods group statements to perform well-defined tasks. Method declarations specify the name, return type, and parameters. The method body contains the statements. Methods can call other methods and control program flow. Overloading allows multiple methods with the same name but different parameters. Variables have either class or block scope depending on where they are declared. Parameters are passed by value for primitives and by reference for objects. The document provides an example Month class to demonstrate these concepts.
This document provides an overview of basic Java programming concepts including:
- Java programs require a main method inside a class and use print statements for output.
- Java has primitive data types like int and double as well as objects. Variables are declared with a type.
- Control structures like if/else and for loops work similarly to other languages. Methods can call themselves recursively.
- Basic input is done through dialog boxes and output through print statements. Formatting is available.
- Arrays are objects that store multiple values of a single type and know their own length. Strings are immutable character arrays.
The document discusses Java methods, explaining that a method is a block of code that performs a specific task and that complex problems can be divided into smaller reusable methods. It describes two types of methods - predefined methods that are defined in Java class libraries and can be directly called, and user-defined methods that are written by programmers to meet specific needs. Examples are provided of how to declare, define, and call both predefined and user-defined methods in Java programs.
This document provides an introduction to object-oriented programming (OOP) concepts. It discusses procedural programming and its limitations. OOP aims to overcome these limitations through concepts like encapsulation, inheritance, polymorphism, and abstraction. Encapsulation binds data and functions together in classes. Inheritance allows deriving new classes from existing classes. Polymorphism allows the same action to be performed in different ways. Abstraction describes things at a conceptual level. Examples are provided to illustrate these core OOP concepts. The next lecture will cover implementing OOP in C# and building a game with Unity 3D.
The document provides an overview of data structures and algorithms. It discusses key topics like:
1) Different types of data structures including primitive, linear, non-linear, and arrays.
2) The importance of algorithms and how to write them using steps, comments, variables, and control structures.
3) Common operations on data structures like insertion, deletion, searching, and sorting.
4) Different looping and selection statements that can be used in algorithms like for, while, and if-then-else.
5) How arrays can be used as a structure to store multiple values in a contiguous block of memory.
This document discusses objects and classes in Java. It defines a class as defining the properties and behaviors of objects. An object represents a real-world entity with a unique identity, state, and behavior. The document discusses declaring objects using the new keyword, defining and calling methods in classes, arrays of objects, constructors, the this keyword, and static members. It provides examples of defining classes, declaring objects, defining methods with and without return values, and passing objects as parameters.
The document provides an overview of advanced class features in Java, including method overloading, overriding, and constructors. It discusses the differences between overloaded and overridden methods, and how to call parent class methods using super. It also covers enumerations, wrapper classes, autoboxing/unboxing, annotations, and inner classes.
This document discusses Java methods. Some key points covered include:
- Methods allow grouping of code to perform operations and are called by name. They can return values.
- Advantages of methods include being time savers, allowing code repetition without retyping, and enabling modular programming.
- The syntax for defining a method includes access modifiers, return type, name, and parameters.
- Methods can be invoked from another method, as shown in an example finding the minimum of two numbers.
Lambda expressions, default methods in interfaces, and the new date/time API are among the major new features in Java 8. Lambda expressions allow for functional-style programming by treating functionality as a method argument or anonymous implementation. Default methods add new capabilities to interfaces while maintaining backwards compatibility. The date/time API improves on the old Calendar and Date APIs by providing immutable and easier to use classes like LocalDate.
02._Object-Oriented_Programming_Concepts.pptYonas D. Ebren
This document discusses object-oriented programming concepts and provides an example of analyzing a software development process using object-oriented principles. It describes a typical 5-step software development process of analysis, design, implementation, testing, and maintenance. It then introduces object-oriented programming concepts like modeling a problem as a set of collaborating objects and components. As an example, it analyzes the classic game Tetris in terms of its objects like pieces and boards, their properties and capabilities.
The document provides an overview of Objective-C basics including the Objective-C language, build and runtime, classes, objects, methods, and data encapsulation. It discusses the three main parts of an Objective-C class which are the @interface section for declarations, the @implementation section for definitions, and the program section for problem solving code. Methods are explained as actions performed on class instances that can affect the object's state. The document also covers how to create objects from classes, access methods, and encapsulate data to hide instance variables from direct access.
OOPS in java | Super and this Keyword | Memory Management in java | pacakages...Sagar Verma
OOPS and its application in Java, Super class AND This Keyword,Java Bean, POJO ,Memory management in Java ,Packages ,Miscellaneous (Var-Args, toString(), Double equals operator(==))
The document outlines the course content for a C++ introductory course, including introductions to OOP concepts like classes and objects, pointers, functions, inheritance, and polymorphism. It also covers basic C++ programming concepts like I/O, data types, operators, and data structures. The course aims to provide students with fundamental C++ programming skills through explanations and examples of key C++ features.
Here is a C++ program that implements a Polynomial class with overloaded operators as specified in the question:
#include <iostream>
using namespace std;
class Term {
public:
int coefficient;
int exponent;
Term(int coeff, int exp) {
coefficient = coeff;
exponent = exp;
}
};
class Polynomial {
public:
Term* terms;
int numTerms;
Polynomial() {
terms = NULL;
numTerms = 0;
}
Polynomial(Term t[]) {
terms = t;
numTerms = sizeof(t)/sizeof(t[0]);
}
~Polynomial() {
delete[] terms;
}
Polynomial
Arrays allow the grouping of multiple values of the same type under a single name. An array is declared with a base type and size, and individual elements can be accessed via an index. Arrays are useful for organizing related data and can be passed to methods. Common array operations include initialization, accessing elements, searching, and sorting. Multidimensional arrays extend the concept to multiple indices.
Arrays allow us to organize multiple values of the same type into a single variable name. An array is declared with square brackets containing the number of elements, and individual elements are accessed via an index number. Arrays can be passed as arguments to methods, where the method can modify class-type elements but only sees the value of primitive-type elements. Array names are reference types, so assigning one array name to another makes them refer to the same array, and the == operator checks for identical references rather than identical element values.
Arrays allow the grouping of multiple values of the same type under a single name. An array is declared with a base type and size, and individual elements can be accessed via an index. Arrays are useful for organizing related data and can be passed to methods. Common array operations include initialization, accessing elements, searching, and sorting. Multidimensional arrays extend the concept to multiple indices.
Arrays allow the grouping of multiple values of the same type under a single name. An array is declared with a base type and size, and individual elements can be accessed via an index. Arrays are useful for organizing related data and can be passed to methods. Common array operations include initialization, accessing elements, searching, and sorting. Multidimensional arrays extend the concept to multiple indices.
Arrays allow us to organize multiple values of the same type into a single variable name. An array is declared with a base type and size, such as int[] grades = new int[100]. Individual elements in the array are accessed using an index from 0 to length-1. Arrays can be passed to methods by reference, allowing the method to modify the array elements. Multidimensional arrays organize data into rows and columns and are declared with multiple sets of brackets like int[][] table = new int[10][20].
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4. Concept of Class
• A class is simply a representation of a type of object
• It is the blueprint/ plan/ template that describe the
details of an object
• For example- mango, apple, orange are the members of
the class fruits
• If fruits has been defined as a class, then the statement
Fruits mango;
• It will create an object mango belonging to the class
fruit
5. Cont……..
• Java is a case-sensitive language
• Class declaration
• Opening braces
• The main line
• The output line
Class Csepu
{
Public static void main (String args[])
{
System.out.println(“Java is better than C++”);
}
}
6. Cont……………
• Class declaration
Class Csepu
– This line uses the keyword class to declare that a new class is
being defined
– Csepu is the name of the class
• Opening braces
{
……
}
– The class definition begins with the opening curly brace ({) and
ends with the closing curly brace (}).
– The elements between the two braces are members of the class
7. Cont………..
• The main line
Public static void main (String args[])
– The keyword public means that the method main() can
be accessed by any other Java class.
– The keyword static means that you don’t have to create
an instance of this class to use this method.
– The keyword void means that the method main()
doesn’t return any value to the calling program.
– The keyword String[] args tells us that this method
will receive an array of characters as the argument
8. Cont…….
• The Output line
System.out.println(“Java is better than C++”);
– This is similar to the printf() statement of C
– Since Java is a true object oriented language, every method
must be part of an object
– The println method is a member of the out object, which is
a static data member of System class
– The method println always appends a newline character to
the end of the string
– This means that any subsequent output will start on a new
line
9. Object
• Objects are instances of a class. It is the building block
of OOP.
• They are the basic runtime entities in an object
oriented system
• They may present a person, a place, a bank account, a
table of data or any item that the program may handle
• Object must have the following three characteristics:
– Identity
– State
– Behavior
10. Concept of Constructors
• A constructor initializes an object when it is created
• It has the same name as its class and is syntactically similar to a method
• However, constructors have no explicit return type
• simple example class Adition
{ public void add()
{int a,b,add;
a=4;b=5;
add=a+b;
System.out.println("Result of Add:
"+add);
}
}
public class Exmcons1
{ public static void main (String args[])
{
Adition obj = new Adition();
obj.add();
}
}
11. Concept of Methods
• Methods are the interface or communications between
program components
• A Java method is a collection of statements that are grouped
together to perform an operation
• As an example when we call the System.out.println method…
– The system actually executes several statements in order to
display a message on the console
– In general, a method has the following syntax
Modifier returnValueType methodName (list of parameters)
{
//method of body;
}
13. Declaring a Methods
• Modifiers
– The modifier, which is optional, tells the compiler how
to call the method
– This defines the access type of the method
• Return Type
– A method may return a value
– The returnValueType is the data type of the value the
method returns
– Some methods perform the desired operations without
returning a value
– In this case, the returnValueType is the keyword void
14. Cont………….
• Method Name
– This is the actual name of the method
– The method name and the parameter list together constitute
the method signature
• Parameters
– A parameter is like a place holder
– When a method is invoked, pass a value to the parameter
– This value is referred to as actual parameter or argument
– The parameter list refers to the type, order, and number of
the parameters of a method
– Parameters are optional; that is, a method may contain no
parameters
15. Cont………….
• Method Body
– The method body contains a collection of statements that define
what the method does
• Example
– The following defined method called max()
– This method takes two parameters num1 and num2 and returns
the maximum between the two
public static int max(int num1, int num2)
{
int result;
if (num1 > num2)
result = num1;
else
result = num2;
return result;
}