StringTest.java

public class StringTest {

	public static void main(String[] args){
        String s="Hello World";
        String s1=new String("Hello World");
        
        String ss=s+" "+s1;
        System.out.println(ss); //Hello World Hello World
               
        System.out.println(s.charAt(0)); //H
        
        System.out.println(s.compareTo(s1)); 
        
        System.out.println(s.concat(" Ekleme")); //Hello World Ekleme
        System.out.println(s.endsWith("rld")); //true
               
        System.out.println(s.equals("hello world")); //false
        System.out.println(s.equalsIgnoreCase("hello world"));//true 
        
        System.out.println(s.indexOf("W")); //6
        System.out.println(s.lastIndexOf("l")); //9
        
        System.out.println(s.length()); //11
                
        System.out.println(s.replaceAll("W","V")); //Hello Vorld
        
        System.out.println(s.startsWith("H")); //true
        
        String sub=s.substring(0,6); 
        System.out.println(sub); //Hello
        
        System.out.println(s.toLowerCase()+" "+s.toUpperCase());//hello world HELLO WORLD
               
    }

}