int and integer

Question

Java

I am one such fool that I did not know that the following code produces false:

Integer i = 200;
Integer j = 200;
if(i == j){
    System.out.print("true");
}else{
    System.out.print("false");
}

and the following returns true:

Integer i = 100;
Integer j = 100;
if(i == j){
    System.out.print("true");
}else{
    System.out.print("false");
}

Answer 1

As far as I know, values ​​from -128 to 127 are in the machine's java object pool, so they have one address in memory, and you compare objects using ==, i.e. link

Answer 2

And here it is - the same cache:
www.grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/6-b14/java/lang/Integer.java#573