继承 示例

首先先创建一个类

public class Father {
private Daughter daughter ;//拥有女儿属性

public Daughter getDaughter() {
return daughter;
}
public void setDaughter(Daughter daughter) {
this.daughter = daughter;
}

//方法 ：监督学习
public void supervisionLearn(){
System.out.println("快点做作业！");
this.daughter .response();

if(this.daughter instanceof PureDaughter){
PureDaughter pd=(PureDaughter)this.daughter;
pd.coquetry();
}
}

}

再创建一个父类

public class Daughter {
public void response(){

}

}

女儿子类

public class BoldDaughter extends Daughter{
public void response(){
System.out.println("忽的站起来，冲进了房间，狠狠地关上了门，念到：真烦！");
}

}

可以再创建另一个不同性格的女儿

最后main方法

public class TestMain {
public static void main(String[]args){
Father li=new Father();

PureDaughter doudou=new PureDaughter();
BoldDaughter lili=new BoldDaughter();
li.setDaughter(doudou);
li.supervisionLearn();
}

}

继承 示例

原文：http://www.cnblogs.com/zjh-/p/5539912.html