案例演示(老师案例)

具体事物：数学老师、体育老师
共性：姓名，年龄，讲课

public class Demo5_Teacher {
    public static void main(String[] args) {
        BaseTeacher bt = new BaseTeacher("david",18);
        bt.teach();
        SportTeacher st = new SportTeacher("sally",18);
        st.teach();
    }
}

Teacher.java

abstract class Teacher{
    private String name;
    private int age;
    public Teacher() {
    }
    public Teacher(String name, int age) {
        this.name = name;
        this.age = age;
    }
    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;
    }
    /**
     * 抽象方法讲课
     */
    public abstract void teach();
}

BaseTeacher.java

class BaseTeacher extends Teacher{
    public BaseTeacher() {
        super();
    }
    public BaseTeacher(String name, int age) {
        super(name, age);
    }
    @Override
    public void teach() {
        System.out.println("奇变偶不变，符号看象限");
    }
}

SportTeacher.java

class SportTeacher extends Teacher{
    public SportTeacher() {
    }
    public SportTeacher(String name, int age) {
        super(name, age);
    }
    @Override
    public void teach() {
        System.out.println("百米赛跑准备，预备...跑");
    }
}