Java program to implement all string operations.

class StringOperation

{

public static void main (String args[])

{

String s1 = "Hello";

String s2 = "World";

System.out.println ("The strings are " s1 "and" s2);

int len1 = s1.length ();

int len2 = s2.length ();

System.out.println ("The length of " s1 " is :" len1);

System.out.println ("The length of " s2 " is :" len2);

System.out.println ("The concatenation of two strings = "

s1.concat (s2));

System.out.println ("First character of " s1 "is=" s1.charAt (0));

System.out.println ("The uppercase of " s1 "is="

s1.toUpperCase ());

System.out.println ("The lower case of " s2 "is="

s2.toLowerCase ());

System.out.println (" the letter e occurs at position"

s1.indexOf ("e") "in" s1);

System.out.println ("Substring of " s1

"starting from index 2 and ending at 4 is = "

s1.substring (2, 4));

System.out.println ("Replacing 'e' with 'o' in " s1 "is ="

s1.replace ('e', 'o'));

boolean check = s1.equals (s2);

if (check == false)

System.out.println ("" s1 " and " s2 " are not same");

else

System.out.println ("" s1 " and " s2 "are same");

}

}