继承

public class Uncle {
private String name;
private int age;
public Uncle(){
System.out.println("Uncle构造方法");
}

public  void faHongbao(){
    System.out.println("舅舅发红包");
}

}
public UncleOne(){
super();
System.out.println("uncleone的构造方法");
}

public void  chouyan(){
    System.out.println("大舅喜欢抽烟");
}
//方法的重写 覆写
public void faHongbao(){
    System.out.println("大舅家道中落，发不起红包了，该送祝福了");
}

}
public class UncleTwo extends Uncle {

public void hejiiu(){
    System.out.println("二舅喜欢喝酒");
}
public void faHongbao(){
    System.out.println("二舅不仅发红包，还送茅台");
}

}
public class UncleOneSon extends UncleOne{

public UncleOneSon(){
    super();
    System.out.println("UncleOneSon的构造方法");
}
public void faHongbao(){
    System.out.println("大舅的儿子厉害了，接着发红包");
}

}
public class Demo {
public static void main(String[] args) {
/* UncleOne uncleOne = new UncleOne();
uncleOne.faHongbao();
uncleOne.chouyan();

    UncleTwo uncleTwo = new UncleTwo();
    uncleTwo.faHongbao();
    uncleTwo.hejiiu();*/

   /* UncleOneSon uncleOneSon = new UncleOneSon();
    uncleOneSon.faHongbao();

*/
new UncleOneSon();
}
}