Java 继承案例：人类、学生和工人

定义 Person 类

public class Person {
    private String name;
    private int age;
    private String gender;
    
    public Person(String name, int age, String gender) {
        this.name = name;
        this.age = age;
        this.gender = gender;
    }
    
    public void eat() {
        System.out.println('吃饭');
    }
    
    public void show() {
        System.out.println('姓名：' + name + '，年龄：' + age + '，性别：' + gender);
    }
}

定义 Student 类

public class Student extends Person {
    private String studentId;
    private int score;
    
    public Student(String name, int age, String gender, String studentId, int score) {
        super(name, age, gender);
        this.studentId = studentId;
        this.score = score;
    }
    
    public void eat() {
        System.out.println('炒菜，吃米饭');
    }
    
    public void show() {
        super.show();
        System.out.println('学号：' + studentId + '，成绩：' + score);
    }
}

定义 Worker 类

public class Worker extends Person {
    private String workerId;
    private double salary;
    
    public Worker(String name, int age, String gender, String workerId, double salary) {
        super(name, age, gender);
        this.workerId = workerId;
        this.salary = salary;
    }
    
    public void eat() {
        System.out.println('炖菜，吃馒头');
    }
    
    public void show() {
        super.show();
        System.out.println('工号：' + workerId + '，薪资：' + salary);
    }
}

测试类

public class Test {
    public static void main(String[] args) {
        Student student = new Student('小明', 17, '男', 'NO13', 82);
        student.eat();
        student.show();
        
        Worker worker = new Worker('老明', 40, '男', 'GH34', 5800);
        worker.eat();
        worker.show();
    }
}