Java Programing laungage

Core Java Tutorial

Introduction of Core Java

How To Install JDk and Set of Path

Syntax of java Program

Difference between Java and C/C++

Advantage and Disadvantage of Java

What is Java

Why Java is not Pure Object Oriented Language

Java has Following Features/Characteristics

Limitation of Java Language and Java Internet

Common Misconception about Java

Simple Program of Java

Integrated Development Environment in java

Compile and Run Java Program

Applet and Comments in Java

Tokens in Java

Keywords in Java

Identifier and Variables in Java


Data Type in Java

Assignments and Initialization in Java

Operators in Java

Rule of Precedence in Java

Operator on Integer and Separators in Java Programming

Java Control Flow of Statements

If and If-else Selection Statement

Nested If-else and If-else-If Selection Statement

switch case and conditional operator Selection Statement

for and while Loop

do..while and for each Loop

break and labeled break statement

continue and labeled continue statement

return Statement and exit() Method

Escape Sequence for Special Characters and Unicode Code

Constants and Block or Scope

Statement in Java

Conversions between Numeric Types in Java

Import Statement in Java

User Input in Java using Scanner Class

User Input in Java using Console Class

Array in Java

One Dimensional Array

Two Dimensional Array

Two Dimensional Array Program

Command Line Argument in Java

String args Types in Java

Uneven/Jagged array in java

Math Class Function and Constant

Math Class all Function used in a program

Enumerated Types in Java

Object Oriented Programming v/s Procedural Programming

Object Oriented Programming Concepts in Java

Introduction to Class,Object and Method in Java

Class Declaration in Java

Class & Objects in java

Encapsulation in Java

Modifiers/Visibility for a Class or Interrface or member of a Class

Polymorphism in Java

Runtime polymorphism (dynamic binding or method overriding)

String class and String Constructors

Characters are the fundamental building blocks of Java source programs. In Java "a string is a sequence of characters". String class is immutable means once a String object has been created, can't change the characters that comprise that string .

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String can be initialized by a string constructor, the String class supports several constructors but to create an empty String default constructor should be used.

i.e., String s = new String(); will create an instance of String with no characters in it.

Since strings are immutable because fixed, immutable strings can be implemented more efficiently than changeable ones.

String Constructors

Class String provides nine constructors for initializing String objects in a variety of ways. Constructor is used for the initialization the object of any class, the String class supports several constructors but to create an empty String default constructor should be used.

i.e., String s = new String(); The new String object contains no characters (the empty string) and has a length of 0.

like String(char chars[ ]) i.e.,

create Strings initialized by an array of characters, using the constructor.

// Example for vale of string from subset of char array.
class StringDemo {
    public static void main(String args[]) {
        byte ascii[] = {65, 66, 67, 68, 69, 70, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90}; 
        String s1 = new String(ascii);
        String s2 = new String(ascii, 1, 3);



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