equals method and '==' little doubt

[kaku kohli]

public class EqualsTest {
    public static void main(String[] args)
    {
    Integer i1 = new Integer(5);
    Integer i2 = new Integer(5);
    Integer i3 = 5;
    Integer i4 = 5;
   
    if(i1.equals(i2)) System.out.println("i1 equals i2"); else System.out.println("i1 not equals i2");
    if(i1==i2) System.out.println("i1==i2"); else System.out.println("i1 != i2");
   
    if(i3.equals(i4)) System.out.println("i3 equals i4"); else System.out.println("i3 not equals i4");
    if(i3==i4) System.out.println("i3==i4"); else System.out.println("i3 != i4");
   
    }
}

why in output i1 != i2 but i3==i4 ?

[Mansukhdeep Thind]

Welcome to the ranch. This is a very frequently asked question here at the ranch. What happens when you say new Integer(5)? Can you explain that first?

[Campbell Ritchie]

It has to do with caching of frequently used values. Start here, where you will find about eight links to old posts. If that doesn’t explain it, please ask again.