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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:
Java-继承 共3题