why its not given any output?

[neelakandan Vijayakumar]

class GFG {
   public static void main (String[] args) {
       
StringBuffer a=new StringBuffer();
StringBuffer b=a.reverse();


   if(a==b){
       int i,j;
      String f=a.toString();
    char []c=f.toCharArray();
    char []d=c;
    int n=a.length();
    int n1=n/2;
    for( i=0;i<n1;i++){
        d[i]=c[i+1];
        System.out.println(d);
    }
   }
   else{
     System.out.println("given string is not palindrome");
   }
   }
   }

[Norm Radder]

It's hard to read and understand the poorly formatted code you have posted.
If none of the print statements are being executed, then the if statement that controls their execution must be false.

The == operator for object references returns true if the two operands refer to the same object.  It looks like a and b refer to different objects and are not the same.
Use the equals() method to test if the contents of two objects is the same.