Why is the Integer wrapper class object and primitive object equal ?

Question

This is my code :
package obectorientation;
public class oo3 {
     public static void main(String[] args) {
          int x=1; float y=1.0F;
          int x1=1;
                                Integer y1= new Integer(1);
          if(x1==y1)
               System.out.println("Equal");
          else
               System.out.println("NOT Equal");
O/P : EqualMy question is why are x1 and y1 equal ? Won't y1 be a different object and x1 just a primitive variable ?
Thanks in Advance.

Answer 1

Specifically, it's because y1 gets unboxed before the comparison. What's really happening is effectively: if ( x1 == y1.intValue() )