java equals与==

        //创建两个对象
        String num1 = new String("Hello");
        String num2 = new String("Hello");
        //b1是num1 == num2
        boolean b1 = num1 == num2;
        //b2是num1.equals(num2)
        boolean b2 = num1.equals(num2);
        System.out.println("b1 = " + b1);  //b1 = false
        System.out.println("b2 = " + b2);  //b2 = true
        //==指的是`对象`是否相同， equals()指的是`值`是否相同