/*
* For number between -130 and +200 make two instances
* of the Integer class for each value.
* Why aren't the instances always distinct???
* @author ggtowell
* Created: July 20, 2021
*/
public class Sttc {
    public static void main(String[] args) {
        for (int i = -130; i < 200; i++) {
            Integer i1 = Integer.valueOf(i);
            // identityHashCode gives the memory location 
            int ii1 = System.identityHashCode(i1);
            Integer i2 = Integer.valueOf(i);
            int ii2 = System.identityHashCode(i2);
            if (ii1 != ii2) {
                System.out.println(String.format("%3d %12d  %12d", i, ii1, ii2));
            }
        }
    }
}