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The document discusses the structure and syntax of the Java programming language, including comments, keywords, identifiers, separators, arrays, packages, classes, methods, and operators such as arithmetic, relational, and logical operators. It also covers Java applications and applets, importing packages, and using the Scanner class to accept user input through the keyboard.
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This document contains lecture notes on Java programming divided into 6 units. Unit 1 provides an introduction to Java including an overview of data types, variables, arrays, operators, control statements, classes and objects, and input/output. It also covers inheritance, abstract classes, and the object class. Subsequent units cover topics like string handling, packages, interfaces, exception handling, multithreading, applets, event handling, AWT, Swings, and JDBC. Examples of Java programs and potential errors are also provided.
Java Notes
This document contains lecture notes on Java programming divided into 6 units. Unit 1 provides an overview of Java and covers data types, variables, arrays, operators, control statements and classes. It also discusses I/O operations like reading console input/output and files. Unit 2 covers string handling and the StringBuffer class. Unit 3 discusses packages, interfaces and exception handling. Unit 4 focuses on multithreading concepts. Unit 5 covers applets, event handling and the Abstract Window Toolkit. Unit 6 introduces Swing and JDBC. The document also includes examples of Java programs and lists lab experiments and reference books.
Java
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The document discusses key concepts in object-oriented programming in Java including classes, objects, inheritance, packages, interfaces, encapsulation, abstraction, and polymorphism. It provides examples to illustrate each concept. Classes define the structure and behavior of objects. Objects are instances of classes. Inheritance allows classes to extend existing classes. Packages organize related classes. Interfaces define behaviors without implementation. Encapsulation hides implementation details. Abstraction models essential features without specifics. Polymorphism allows the same method name with different signatures or overriding.
Java basic part 2 : Datatypes Keywords Features Components Security Exceptions
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พื้นฐานภาษาจาวา
- 3. 1) OOP: Object Oriented Programming) 2) Java platform independence java 3) Free Source Open
- 4. Java 1. Structure 1.1 Comment Source code - comment comment //comment comment - comment comment */ /* Comment Comment */
- 5. 1.2 Keyword Java class,boolean,char 1.3 Identifiers method , , class ,_,$
- 6. Java 1) Java Application Java 2) Java Applets Java HTML Browser Utilities Web Java
- 7. 1.4 Separators 1. 2. 3. method parameter private void hello( ); if ,while,for ,do if ( i=0 ) casting String a=( String )x;
- 8. 1. 2. - 1. Array String a[ ]; index a[ 0 ]=10; ; String a ; , array String a , b , c; 1. 2. package,subpackage package com.test.Test1; method object.hello(); class Object
- 9. - {} method class class A{ } Private void hello(){ } 2. String a[]={"A","B","C"}; Array
- 11. keyboard System.in keyboard = new Scanner(System.in); Scanner
- 13. int number; Scanner keyboard = new Scanner(System.in); System.out.print(“Enter an integer value: “); number = keyboard.nextInt();
- 16. Operator "*"(Multiply) 1 "/" (Divide) 2 "%" (Modulus) 3 "+" (Add) 4 "-" (Minus) op1-op1: 5
- 17. class BasicMath{ public static void main (String args[]){ int a = 1 + 1; int b = a * 3; int c = b / 4; int d = b " a; int e = -d; int f = 9%5; System.out.println("a = " + a); System.out.println("b = " + b); System.out.println("c = " + c); System.out.println("e = " + e); System.out.println("9%5 = " + 9%5); } }
- 19. Relational Operator < Op1<Op2 : Op2 <= Op1<=Op2 : Op2 Op1 Op1 a=(1<3); //a a=(5<=7); //a Op2 > Op1>Op2 : Op1 >= Op1>=Op2 : Op2 Op1 a=(5>=7); //a == Op1==Op2 : Op2 Op1 a=(5==7); // a 5 7 != Op1!=Op2 : Op2 ": (expression)"a:b : expression Op1 operand a Op2 a=(5>7); //a a=(5!=7); // a 5 7 a=(3>5)"false:true; //a 3 5 true
- 21. 1 2 AND true 1 true true 1 false false 0 true false 0 false 1 true 0 false 1 false 0 false 1 OR XOR true 1 false 0 true 1 true 1 0 true 1 true 1 0 false 0 false 0 0
- 22. Boolean Operator Operator ! NOT) !(Op1) && AND) Op1 && Op2 Op2 || OR) Op1 || Op2 Op2 a= !(true); // a Op1 a= !(true && false); // a Op1 a= !(true); // a
- 24. Object String 6 1 String Object = new String( ; 2 String Object = ; 3 String (char chars[]); String Array Chars String
- 25. 4 String (char chars[], int startIndex, int numChars); Array String startIndex array numChars startIndex
- 26. 5 String ( String String String ; String String 6 Array ASCII - String (byte asciiChars[]); String