继承-java基础语法

// 父类
public class Person {
    private String name;
    private int age;
    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }
}

// 子类
public class Father extends Person {
    public Father(String name, int age) {
        super(name, age);
    }

    public void eat() {
        System.out.println(getAge() + ", " + getName());
    }
}

// 测试入口
public class Test {
    public static void main(String[] args) {
        Person p = new Father("John", 30);
        if (p instanceof Father f) f.eat();
    }
}