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Java-继承 共3题

时间:2016-09-21 10:22:14      阅读:195      评论:0      收藏:0      [点我收藏+]

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一、实现一个名为Person的类和它的子类Employee,Employee有两个子类Faculty和Staff。具体要求如下:

(1)Person类中的属性有:姓名name(String类型),地址address(String类型),电话号码telphone(String类型)和电子邮件地址email(String类型);

(2)Employee类中的属性有:办公室office(String类型),工资wage(double类型),受雇日期hiredate(String类型);

(3)Faculty类中的属性有:学位degree(String类型),级别level(String类型);

(4)Staff类中的属性有:职务称号duty(String类型)。

package com.jicheng;

public class Person1 {
    //属性
    private String name;
    private String addrees;
    private String telphone;
    private String email;
   
  
public String getName() { return name; } public void setName(String name) { this.name = name; } public String getAddrees() { return addrees; } public void setAddrees(String addrees) { this.addrees = addrees; } public String getTelphone() { return telphone; } public void setTelphone(String telphone) { this.telphone = telphone; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } }

 

package com.jicheng;

public class Employee extends Person1 {
    private String office;
    private double wage;
    private String hiredate;
    public String getOffice() {
        return office;
    }
    public void setOffice(String office) {
        this.office = office;
    }
    public double getWage() {
        return wage;
    }
    public void setWage(double wage) {
        this.wage = wage;
    }
    public String getHiredate() {
        return hiredate;
    }
    public void setHiredate(String hiredate) {
        this.hiredate = hiredate;
    }
    

}

 

package com.jicheng;

public class Faculty extends Employee {
    public String getDegree() {
        return degree;
    }
    public void setDegree(String degree) {
        this.degree=degree;
    }
    public String getLevel() {
        return level;
    }
    public void setLevel(String level) {
        this.level = level;
    }
    private String degree;
    private String level;
    

}

 

package com.jicheng;

public class Staff extends Employee{
    private String duty;

    public String getDuty() {
        return duty;
    }

    public void setDuty(String duty) {
        this.duty = duty;
    }
    

}

测试:

package com.jicheng;

public class Test02 {

    public static void main(String[] args) {
        Faculty fa=new Faculty();
        fa.setName("李凯");
        fa.setTelphone("18353367925");
        fa.setDegree("博士");
        System.out.println("姓名:"+fa.getName()+"  电话:"+fa.getTelphone()+"  学历:"+fa.getDegree());
    
        Staff st=new Staff();
        st.setName("韩如月");
        st.setWage(10000);
        st.setDuty("主管");
        System.out.println("姓名:"+st.getName()+"  工资:"+st.getWage()+"  职位:"+st.getDuty());
    
    }

}

结果:

技术分享

二、编写一个Car类,具有String类型的属性品牌,具有功能drive;定义其子类Aodi和Benchi,具有属性:价格、型号;具有功能:变速;定义主类E,在其main方法中分别创建Aodi和Benchi的对象并测试对象的特性。

public class Car {
   
      //品牌属性
     private String pinpa;                
    private double sudu;
    //成员方法
    public String getPinpa() {
        return pinpa;
    }

    public void setPinpa(String pinpa) {
        this.pinpa = pinpa;
    }

    public double getSudu() {
        return sudu;
    }

    public void setSudu(double sudu) {
        this.sudu = sudu;
    }

    public String drive(){
        return "汽车已启动!";
    }
    
}    

 

public class Aodi extends Car{
    private double jiage;
    private String xinghao;
    
    public double getJiage() {
        return jiage;
    }

    public void setJiage(double jiage) {
        this.jiage = jiage;
    }

    public String getXinghao() {
        return xinghao;
    }

    public void setXinghao(String xinghao) {
        this.xinghao = xinghao;
    }

    public double biansu(){
        double sudu=super.getSudu()+20;
        return sudu;
    }

}

 

public class Benchi extends Aodi{
    public double biansu(){
        double sudu=super.getSudu()+30;
        return sudu;
    }

}

测试:

public class E {
    public static void main(String[] args){
        Aodi aodi=new Aodi();
        aodi.setJiage(1000000);
        aodi.setXinghao("奥迪");
        System.out.println("奥迪车的型号是:"+aodi.getXinghao()+" 价格是:"+aodi.getJiage());
        System.out.println(aodi.drive());
        System.out.println("速度为:"+aodi.biansu());

三、

按要求编写一个Java应用程序:

(1)编写一个矩形类Rect,包含:

两个属性:矩形的宽width;矩形的高height。

两个构造方法:

1.一个带有两个参数的构造方法,用于将width和height属性初化;

2.一个不带参数的构造方法,将矩形初始化为宽和高都为10。

两个方法:

求矩形面积的方法area()

求矩形周长的方法perimeter()

(2)通过继承Rect类编写一个具有确定位置的矩形类PlainRect,其确定位置用

矩形的左上角坐标来标识,包含:

添加两个属性:矩形左上角坐标startX和startY。

两个构造方法:

带4个参数的构造方法,用于对startX、startY、width和height属性

初始化;

不带参数的构造方法,将矩形初始化为左上角坐标、长和宽都为0

的矩形;

添加一个方法:

判断某个点是否在矩形内部的方法isInside(double x,double y)。如在矩

形内,返回true, 否则,返回false。

                提示:点在矩形类是指满足条件:

                     x>=startX&&x<=(startX+width)&&y<startY&&y>=(startY-height)

(3)编写PlainRect类的测试程序

创建一个左上角坐标为(10,10),长为20,宽为10的矩形对象;

计算并打印输出矩形的面积和周长;

判断点(25.5,13)是否在矩形内,并打印输出相关信息。

package com.jicheng;

public class Rect {
    //属性
    private double width;
    private double height;
    //有参构造方法
    public Rect(double width, double height) {
        super();
        this.width = width;
        this.height = height;
    }
    //无参构造方法
    public Rect() {
        super();
        this.width=10;
        this.height=10;
    }
    //get  set
    public double getWidth() {
        return width;
    }
    public void setWidth(double width) {
        this.width = width;
    }
    public double getHeight() {
        return height;
    }
    public void setHeight(double height) {
        this.height = height;
    }
    //面积
    public double area()
    {
        return this.height*this.width;
    }
    //周长
    public double perimeter()
    {
        return (this.height+this.width)*2;
    }

}

 

package com.jicheng;

public class PlainRect extends Rect{
    private double startX;
    private double startY;
    //带参数构造
    public PlainRect(double width, double height, double startX, double startY) {
        super(width, height);
        this.startX = startX;
        this.startY = startY;
    }
    //无参构造方法
    public PlainRect() {
        super(0,0);
        this.startX=0;
        this.startY=0;
    }
    public double getStartX() {
        return startX;
    }
    public void setStartX(double startX) {
        this.startX = startX;
    }
    public double getStartY() {
        return startY;
    }
    public void setStartY(double startY) {
        this.startY = startY;
    }
    /***
     * 判断是否在矩形内
     * @param x 点x坐标
     * @param y 点y坐标
     * @return    是否在矩形内
     */
    public Boolean isInside(double x,double y)
    {
        return x>=startX&&x<=(startX+getWidth())&&y<startY&&y>=(startY-getHeight());
    }
    
    
}

测试:

package com.jicheng;

public class Test03 {

    public static void main(String[] args) {
        PlainRect pl=new PlainRect(10,20,10,10);
        System.out.println("矩形面积="+pl.area());
        System.out.println("矩形周长="+pl.perimeter());
        System.out.println("测试点是否在矩形内:"+pl.isInside(14, 9));

    }

}

结果:

技术分享

 

Java-继承 共3题

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原文地址:http://www.cnblogs.com/tfl-511/p/5891520.html

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