String in java

What is String in java

Generally, String is a sequence of characters. But in Java, string is an object that represents a sequence of characters. The java.lang.String class is used to create a string object.

How to create a string object?

There are two ways to create String object:

1. By string literal
2. By new keyword

String Literal

Java String literal is created by using double quotes. 

For Example: String s="welcome";  

 By new keyword

String s=new String("Welcome");//creates two objects and one reference variable

Example Program:

class StringDemo

{

public static void main(String args[])

{

String str=new String("Hello");

System.out.println(str);

System.out.println(str.length());

System.out.println(str.indexOf("H"));

System.out.println("Character at="+str.charAt(4));

System.out.println(str.toUpperCase());

System.out.println(str.toLowerCase());

System.out.println(str.compareTo("hello"));

System.out.println(str.trim());

 }

}