45. Applet back color

import java.applet.*;
import java.awt.*; 
/* <applet code="Appcolor" height=200 width=200> 
    </applet>  */ 
public class Appcolor extends Applet
{
        String a;  
        public void init()
       {
          setBackground(Color.blue);
          setForeground(Color.red); 
          Label l1=new Label("Hello",Label.RIGHT);     
          add(l1);     
          a="hiiiiiiiiiiiiiiiii";     
        }
    public void Paint(Graphics g)  
   {
          g.drawString(a,10,40);  
   }
}   

42. Program for replace word in string in java

class replace

{

            public static void main(String args[])

            {

                        String s1="This is Aditi";

                        String s2,s3;

                        s2=s1.replace('i','w');

                        s3=s1.replace("This","That");

                        System.out.println(s2);

                        System.out.println(s3);

            }

}

41.Program for substring in java

class printlast

{

            public static void main(String args[])

            {

                        String s="This is Aditi";

                        System.out.println(s.substring(8));

                        System.out.println(s.substring(4,7));

                        System.out.println(s.substring(0,4));

            }

}

40.Program for indexOf in java

class position

{

            public static void main(String args[])

            {

                        String s=new String("Welcome to computer");

                       

                        System.out.println(s.indexOf('q'));

            }

}

39.Program for delete char in string in java

import java.io.*;

class limit

{

            public static void main(String args[])

            {

                       

                        StringBuffer sk=new StringBuffer("helloooooo");

                        System.out.println("Result:"+sk);

                        System.out.println("Result:"+sk.length());

                        System.out.println("Result:"+sk.capacity());  //length+16

                        sk.setLength(5);

                        System.out.println("Result:"+sk);      

                        sk.reverse();

                        System.out.println("Result:"+sk);

                        sk.delete(1,4);       //deletes 1,2,3 not 4

                        System.out.println("Result:"+sk);

                        sk.deleteCharAt(0);   //deletes particularly 0

                        System.out.println("Result:"+sk);    //indexing is changed

            }

}

38.Program for reverse print of string in java string

import java.io.*;

class limit

{

            public static void main(String args[])

            {

                       

                        StringBuffer sk=new StringBuffer("helloooooo");

                        System.out.println("Result:"+sk);

                        System.out.println("Result:"+sk.length());

                        System.out.println("Result:"+sk.capacity());  //length+16

                        sk.setLength(5);

                        System.out.println("Result:"+sk);      

                        sk.reverse();

                        System.out.println("Result:"+sk);

                        sk.delete(1,4);       //deletes 1,2,3 not 4

                        System.out.println("Result:"+sk);

                        sk.deleteCharAt(0);   //deletes particularly 0

                        System.out.println("Result:"+sk);    //indexing is changed

            }

}