Java-继承 共3题
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:
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:
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