public class EqualsExercise01 {
    public static void main(String[] args) {
        Person person1 = new Person("jack",10,'男');
        Person person2 = new Person("jack",10,'男');

        System.out.println(person1.equals(person2));//false
    }
}

class Person{
    private String name;
    private int age;
    private char gender;

    //重写 Object 的 equals 方法
    public boolean equals(Object obj) {
        //判断如果比较的两个对象是同一个对象，则直接返回 true
        if (this == obj){
            return true;
        }
        //类型判断
        if (obj instanceof Person){//是Person才作比较
            //进行 向下转型,因为需要得到obj的各个属性
            Person p = (Person) obj;
            return this.name.equals(p.name) && this.age == p.age && this.gender == p.gender;
        }
        //如果不是 Person ，则直接返回 false
        return false;
    }

    public Person(String name, int age, char gender) {
        this.name = name;
        this.age = age;
        this.gender = gender;
    }

    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 char getGender() {
        return gender;
    }

    public void setGender(char gender) {
        this.gender = gender;
    }
}

public class EqualsExercise02 {
    public static void main(String[] args) {
        Person p1 = new Person();
        Person p2 = new Person();
        p1.name = "xdr";
        p2.name = "xdr";

        System.out.println(p1 == p2);//false
        System.out.println(p1.name.equals(p2.name));//true
        System.out.println(p1.equals(p2));//false

        String s1 = new String("asdf");
        String s2 = new String("asdf");
        System.out.println(s1.equals(s2));//true
        System.out.println(s1 == s2);//false
    }
}

class Person{
    public String name;

}