Java中的toString重写和equals重写

Java中的toString重写和equals重写

1. equals默认是调用boject的方法；但子类和父类的哈希对象地址不可能一致；则需要对方法进行重写
2. toString默认的调用object的方法；输出16进制的哈希对象地址值；这里通过重写；使其格式化输出

    package com.msb02;

    public class Person {
        String name;
        int age;
        double hight;

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public int getAge() {
            return age;
        }

        public void setAge(int age) {
            this.age = age;
        }

        public double getHight() {
            return hight;
        }

        public void setHight(double hight) {
            this.hight = hight;
        }

        public Person() {
        }

        public Person(String name, int age, double hight) {
            this.name = name;
            this.age = age;
            this.hight = hight;
        }
        /*
        @Override
        public String toString() {
            return "Person{" +
                    "name='" + name + '\'' +
                    ", age=" + age +
                    ", hight=" + hight +
                    '}';
        }*///这里的类型是object不是person；所以将object转为person
        public boolean equals(Object obj) {
            //这里是将obj转为Person类型；将父类向下转换成子类;调用子类特有属性；这里父类的对象属性obj；子类的person
            Person other=(Person)obj;
            if(this.getAge()==other.getAge()&&this.getName()==other.getName()&&this.getHight()==other.getHight()){
                return true;
            }
            return false;
        }
    }

    package com.msb02;

    public class Test {
        public static void main(String[] args) {
            Person person = new Person("丽丽",24,165.3);
            Person per =new Person("丽丽",24,165.3);
            System.out.println(person.equals(per));//这个时equals比较两个值person大小

        }
    }