Java学习笔记——多态数组

Person类（父类）

package poly.array;

public class Person {
    private String name;
    private int age;

    public Person() {
    }

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

    public String say(){
        return "name = " + this.name + "t" + "age = " + this.age;
    }
}

Student类（子类）

package poly.array;

public class Student extends Person{

    private int score;

    public Student() {
    }

    public Student(String name, int age, int score) {
        super(name, age);
        this.score = score;
    }

    @Override
    public String say() {
        return super.say() + "t" + "score = " + score;
    }
}

Teacher类（子类）

package poly.array;

public class Teacher extends Person{

    private int salary;

    public Teacher() {
    }

    public Teacher(String name, int age, int salary) {
        super(name, age);
        this.salary = salary;
    }

    @Override
    public String say() {
        return super.say() + "t" + "salary = " + this.salary;
    }
}

package poly.array;

public class Test {
    public static void main(String[] args) {
        Person[] people = new Person[5];
        people[0] = new Student("amei",21,90);
        people[1] = new Person("aha",20);
        people[2] = new Student("marry",30,89);
        people[3] = new Teacher("socro",40,30000);
        people[4] = new Teacher("madalam",79,100000);

        for (Person p:people
             ) {
            System.out.println(p.say());
        }
    }
}

name = amei age = 21 score = 90
name = aha age = 20
name = marry age = 30 score = 89
name = socro age = 40 salary = 30000
name = madalam age = 79 salary = 100000

 for (Person p:people
             ) {
            System.out.println(p.say());

            if (p instanceof Student)
                ((Student) p).study();
            else if (p instanceof Teacher)
                ((Teacher) p).teach();
        }

name = amei age = 21 score = 90
ameiis studying…

name = aha age = 20
name = marry age = 30 score = 89
marryis studying…

name = socro age = 40 salary = 30000
socrois teaching…

name = madalam age = 79 salary = 100000
madalamis teaching…