对于包装类型Integer的值比较与int的值比较是不同的；

public class Java_Val_Compare {

    public static void main(String[] args) {
        Integer a1 = 127;
        Integer a2 = 127;
        System.out.println("a1==a2?:\t"+(a1==a2));
        
        Integer b1 = 128;
        Integer b2 = 128;
        System.out.println("b1==b2?:\t"+(b1==b2));
    
        System.out.println("b1.intValue()==b2.intValue()?:\t"
        +(b1.intValue()==b2.intValue()));
    }
}

执行结果: