关键字extends

extend关键字是单继承，即一个子列只能友谊直接父类和多个简介的父类。

继承的问题：

  1.父类的私有化的成员不能被继承

  2.父类的构造方法不能继承

 3.子类创建对象时，默认先会调用父类的无参构造方法

package com.test5;

public class Fathers {
private String name;
public int money;
private int age;

public Fathers() {
super();
// TODO Auto-generated constructor stub
}
public Fathers(String name, int money, int age) {
super();
this.name = name;
this.money = money;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getMoney() {
return money;
}
public void setMoney(int money) {
this.money = money;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public void meng(){
System.out.println("我有一个梦想");
}
}
class Zis extends Fathers{
private String name;
private int age;
}