public static void main(String[] args) {
    Integer i = new Integer(10);
    Integer j = new Integer(10);
    if (i == j){
        System.out.println("相等");
    }else {
        System.out.println("不相等");
    }

    Integer a = 10;
    Integer b = 10;
    if (a == b){
        System.out.println("相等");
    }else {
        System.out.println("不相等");
    }

    Integer m = 128;
    Integer n = 128;
    if (m==n){
        System.out.println("相等");
    }else {
        System.out.println("不相等");
    }

}

當(dāng)new一個對象時就是創(chuàng)建一個空間，兩個對象地址不相同。當(dāng)在-127和127之間時，默認使用int方式復(fù)制，超過整個區(qū)間則會創(chuàng)建對象