Integer Wrappers Comparison doubt

[Harsha Subbarayappa]

Hi Can anyone please explain why it prints

i1 i2 not equal
i3 i4 both equal

Thanks.

    
class IntegerWrapper{
	public static void main(String args[]){
		Integer i1 = 5000;
		Integer i2 = 5000;

		if(i1 == i2) 
			System.out.println("i1 i2 both equal");
		else
			System.out.println("i1 i2 not equal");
		Integer i3 = 20;
		Integer i4 = 20;

		if(i3 == i4) System.out.println("i3 i4 both equal");
		
	}
}

[Seetharaman Venkatasamy]

  
Integer i1  = 127;
Integer i2  = 127;
System.out.println(i1==i2)

Integer i3  = 128;
Integer i4  = 128;
System.out.println(i3==i4);
 

try above. by the way : do you know about IntegerCache?

<edit>corrected syntex</edit>

[Harsha Subbarayappa]

Got it...

http://www.owasp.org/index.php/Java_gotchas

Thanks you very much.

[Wouter Oet]

Harsha please UseCodeTags when posting code. It will highlight your code and make it much easier to read. It probably will also increase the number of people helping you. I will add them for you this time so that you can see the difference.