strings programms

// understanding the strings

class  StringsTest

{

          public static void main(String[] args)

          {

                   // create 3 strings

                   String s1="This is java";

                   String s2=new String(" I like it");

                   char ch[]={'P','o','t','h','u','r','a','i'};

                   String s3= new String(ch);

                   // display the strings

                   System.out.println("S1 = "+s1);

                   System.out.println("S2 = "+s2);

                   System.out.println("S3 = "+s3);

                   // find no . of charecters in s1

                   System.out.println("length of S1 = "+s1.length( ));

                   // join 2 strings

                   System.out.println("S1 joined with s2 = "+s1.concat(s2));

                   // join 3 strings

                   System.out.println(s1+" at "+s3);

                   // check the starting of s1

                   boolean x=s1.startsWith ("This");

                   if(x==true)

                             System.out.println("s1 starts with This ");

                   else

                             System.out.println("S1 does not start with This ");

                   /* extract substring from s1 & s3

                   String p=s2.subString(0,6);

                   String q=s3.subString(0);

                   System.out.println(p+q); */

                   //change the case of s3

      System.out.println("Upper case of s3 = "+s3.toUpperCase( ));

                System.out.println("Lower case of S3 = "+s3.toLowerCase( ));

          }

}

D:\prr\Core java>javac StringsTest.java

D:\prr\Core java>java StringsTest

S1 = This is java

S2 =  I like it

S3 = Pothurai

length of S1 = 12

S1 joined with s2 = This is java I like it

This is java at Pothurai

s1 starts with This

Upper case of s3 = POTHURAI

Lower case of S3 = pothurai

// equality of strings

class StringEqual

{

public static void main(String args[])

{

String a="Hello";

String b=new String("Hello");

if(a==b)

System.out.println("same");

else

System.out.println("Not same");

}

}

D:\prr\Core java>javac StringEqual.java

D:\prr\Core java>java StringEqual

Not same