JAVA学习笔记1

package com.hspstudy.Test1;

public class Extend_ {
    public static void main(String[] a) {
        GraFather graFather = new GraFather("勤才", "很强", "Smoking");
        GraFather father = new Father("平", "非常强", "soilder");
        GraFather mine = new Mine("康", "弱", "book","studying");
        String name = graFather.getName();
        System.out.println(mine);
    }

}
/*
    构造器儿子需要四个构造器，空的，有自己的，有父亲的，有爷爷的
    private 封装  extends继承   编译类型是爷爷 多态

    作用域很重要呀
 */
class Mine extends Father{
    private String sprint;
    public Mine(String name,String babay,String habay,String work) {
        super(name,babay,habay,work);

    }
    public Mine(String name,String babay,String habay,String work,String sprint) {
        super(name,babay,habay,work);
        this.sprint = sprint;
    }

    public String getSprint() {
        return sprint;
    }

    public void setSprint(String sprint) {
        this.sprint = sprint;
    }

    @Override
    public String toString() {
        return "Mine{" +
                "sprint='" + sprint + '\'' +
                '}';
    }
}
class Father extends GraFather{
    private String work;
    public Father(String name,String babay,String habay) {
        super(name,babay,habay);
    }
    public Father(String name,String babay,String habay,String work) {
        super(name,babay,habay);
        this.work = work;
    }

    public String getWork() {
        return work;
    }

    public void setWork(String work) {
        this.work = work;
    }
}
class GraFather{
    private String name;
    private String baday;
    private String habay;

    public GraFather(String name, String baday, String habay) {
        this.name = name;
        this.baday = baday;
        this.habay = habay;
    }
    public void setName(String NA){
        this.name = NA;
    }
    public String getName(){
        return this.name;
    }

    public String getBaday() {
        return baday;
    }

    public void setBaday(String baday) {
        this.baday = baday;
    }

    public String getHabay() {
        return habay;
    }

    public void setHabay(String habay) {
        this.habay = habay;
    }

    @Override
    public String toString() {
        return "GraFather{" +
                "name='" + name + '\'' +
                ", baday='" + baday + '\'' +
                ", habay='" + habay + '\'' +
                '}';
    }
}