Integer Caching

IntegerTest.java

/**
 * {@link Integer} will cache the integers between -128 and 127 (inclusive). See
 * {@link Integer#valueOf(int)} for detail implementation.
 * 
 * @author khotyn
 * 
 */
public class IntegerTest {
    public static void main(String[] args) {
        int i = 1000, j = 1000;
        System.out.println(i == j); // The result is true.

        Integer int1 = 100, int2 = 100;
        System.out.println(int1 == int2); // The result is true.

        Integer int3 = 200, int4 = 200;
        System.out.println(int3 == int4); // The result is false.
    }
}