public class AutoboxDemo{

public static void main(String[] args){

Integer i1 = 127; // Use jd-gui tool to check the class file. You can find the truth: Integer i1 = Integer.valueOf(127);

Integer i2 = 127;

System.out.println(i1 == i2); // output: true. 127 lies in the internal cache of the Integer class.

System.out.println(i1 < i2); // auto unboxing before comparison operation: localInteger1.intValue() < localInteger2.intValue()

System.out.println(i1 > i2);

System.out.println(i1 + i2); // auto unboxing before addition operation.

i1 = 30000;

i2 = 30000;

System.out.println(i1 == i2); // output: false. 30000 does not lie in the internal cache of the Integer class.

System.out.println(i1 < i2);

System.out.println(i1 > i2);

i2 = 30001;

System.out.println(i1 < i2);

System.out.println(i1 + i2);

}

}