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This code uses == to compare two integer objects. From EXP03-J we know that for == to return true for two object references, they must point to the same underlying object. We thus deduce that the results of using the == operator in this code here will be misleading.
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public class TestWrapper2 {
public static void main(String[] args) {
Integer i1 = 100;
Integer i2 = 100;
Integer i3 = 1000;
Integer i4 = 1000;
System.out.println(i1==i2);
System.out.println(i1!=i2);
System.out.println(i3==i4);
System.out.println(i3!=i4);
}
}
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