004ConditionalsInjavaJAVA中的条件句

//Test004.javapublic class Test004 {    public static void main(String[] args) {        int a =8;        int b =8;        if(a==b){            System.out.PRintln("a is equal to b.");        }        else{            System.out.println("a is not equal to b.");        }        /*         * == and equals         *The Operator == works a bit different on objects than on primitives.          When we are using objects and want to check if they are equal, the          operator == wiil say if they are the same, if you want to check if          they are logically equal, you should use the equals method on the object.          For example:        */        String person_a=new String("gavin");        String person_b=new String("gavin");        String person_c=person_a;        System.out.println(person_a==person_b);//这里会输因为false,        //因为person_a和person_b不是一个对象，分配的物理空间的地址不一样        System.out.println(person_a.equals(person_b));//这里会输出true,        //因为person_a和persion_b的逻辑值一样，都是gavin        System.out.println(person_a==person_c);//这里会输出true,        //因为person_a和person_b实际上是同一个对象    }}