java中的例項判斷

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 +
                '}';
                return (this == obj);
    }*/
    public boolean equals(Object obj) {
        //判斷obj類例項是否屬於Person的子類
        if( obj instanceof Person)
        {//把person轉成obj型
            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 Cat {

}

package com.msb02;

public class Test {
    public static void main(String[] args) {
        Person person = new Person("麗麗",24,165.3);
        Person per =new Person("麗麗",24,165.3);
        Cat cat = new Cat();
        boolean a = person.equals(cat);//判斷cat是否和person相同
        System.out.println(a);
    }
}