2. Chapter 1: Introduction
1.1 Computer Programs
A computer program is a sequence of instructions and decisions.
Programming is the act of designing and implementing computer programs.
1.2 The Anatomy of a Computer
The central processing unit (CPU) performs program control and data processing.
Storage devices include memory and secondary storage.
1.3 The Java Programming Language
Java is a high-level programming language.
The name of the class must be the same from the source file.
Java is case-sensitive.
5. Chapter 1: Introduction
1.5 Analyzing your First Program
Each source file can have at most one class with the exception of inner classes (discussed
later on in the course).
1.6 Errors
A compile-time error is a violation of the programming language rules that is detected
by the compiler.
A run-time error causes a program to take an action that the programmer did not intend.
6. Chapter 2: Using Objects
2.1 Objects and Classes
Objects are entities in your program that you manipulate by calling methods.
A method is a sequence of instructions that accesses the data of an object.
A class describes a set of objects with the same behavior.
2.2 Variables
A variable is a storage location with a name.
Names for the variables can be any identifier.
All identifiers must start with either a letter( a to z or A to Z ) or currency character($) or
an underscore.
After the first character, an identifier can have any combination of characters.
A Java keyword cannot be used as an identifier.
Identifiers in Java are case sensitive, foo and Foo are two different identifiers.
Variables must be declared and initialized before used.
7.
8. Chapter 2: Using Objects
2.3 Calling Methods
Overloaded VS Overriden
int f(int a)
int f()
void f()
void f(int a)
2.4 Constructing Objects
Constructors are special kind of methods with two major differences
1. It doesn’t have any return type (not even void).
2. The name of the constructor is the same name of the class.
Stack and Heap
Details in next slide.
10. Chapter 2: Using Objects
2.5 Accessor and Mutator methods
An accessor method does not change the internal data of the object on which it is
invoked. A mutator method changes the data.
2.6 The API Documentation
Demonstration
2.8 Object References
Details on next slide.
12. Chapter 3: Implementing Classes
3.1 Instance variables and encapsulation
Each object has its own properties.
Encapsulation is the process of hiding implementation details and providing methods for
data access.
Private, public and protected.
Basic structure of a class in next slide.
14. Chapter 3: Implementing Classes
3.6 Local Variables
Local variables are declared in the body of a method.
Scope of local variables and parameters.
Local variables must be initialized.
Instance variables are initialized to a default if not initialized explicitly.
Arguments VS Parameters.
18. Chapter 4: Fundamental Data Types
4.2 Arithmetic
If both expressions in a division are integers the result will be an integer.
Math class
Casting
Static
4.3 Input and Output
Scanner class
Printf
4.5 Strings
Strings are sequences of characters.
String class in the API.
Concatenation
Escape sequences (n, t, , ’, ”)
