this program is not working correctly

public class samp3 { public static void main(String args[]) { StringBuffer d=new StringBuffer("mom"); System.out.println(d); StringBuffer c=new StringBuffer(d); c.reverse(); System.out.println(c); if(c==d) { System.out.println("It is palindrome"); } else { System.out.println("It is not palindrome"); } } }