第三次作业
1
package com.hanqi.test;
public class Instrument {
public void play()
{
System.out.println("弹奏乐器");
}
}


package com.hanqi.test;
public class Wind extends Instrument {
public void play()
{
System.out.println("弹奏wind");
}
public void play2()
{
System.out.println("调用wind的play2");
}
}


package com.hanqi.test;
public class Brass extends Instrument {
public void play()
{
System.out.println("弹奏Brass");
}
public void play2()
{
System.out.println("调用Brass的play2");
}
}


package com.hanqi.test;
public class Music {
public static void main(String[] args) {
Instrument i=new Instrument();
i.play();
Wind w=new Wind();
w.play();
w.play2();
Brass b=new Brass();
b.play();
b.play2();
}
}

2
package zhongqiuzuoye;
public class Monkey {
Monkey(String s)
{}
public void speak()
{
System.out.println("咿咿呀呀......");
}
}
package zhongqiuzuoye;
public class People1 extends Monkey{
People1(String s) {
super(s);
}
public void speak()
{
System.out.println("小样的，不错嘛！会说话了！");
}
public void think()
{
System.out.println("别说话！认真思考！");
}
}
package zhongqiuzuoye;
public class E1 {
public static void main(String[] args) {
Monkey m = new Monkey("tom");
m.speak();
People1 p = new People1("Xiaoming");
p.speak();
p.think();
}
}
3
package jvxing;
public class Jvxing
{
//成员变量
private double width;
private double chang;
public double getWidth() {
return width;
}
public void setWidth(double width) {
this.width = width;
}
public double getChang() {
return chang;
}
public void setChang(double height) {
this.chang = height;
}
//成员方法
public double mianji()
{
return this.width*this.chang;
}
}


package jvxing;
public class Cft extends Jvxing
{
//定义新的成员变量高
private double height;
public double getHeight() {
return height;
}
public void setHeight(double height) {
this.height = height;
}
//定义新的成员方法求体积
public double tiji()
{
return this.getChang()*this.getHeight()*this.getWidth();
}
}


package jvxing;
public class Text_jvxing {
public static void main(String[] args) {
//实例化矩形对象求面积
Jvxing j= new Jvxing();
j.setWidth(10);
j.setChang(15.3);
System.out.println("矩形的长为："+j.getChang()+" 宽为："+j.getWidth());
System.out.println("矩形的面积为："+j.mianji());
//实例化长方体对象求体积
Cft c = new Cft();
c.setChang(2);
c.setHeight(3.2);
c.setWidth(100);
System.out.println("长方体的长为："+c.getChang()+" 宽为："+c.getWidth()+" 高为："+c.getHeight());
System.out.println("长方体的体积为："+c.tiji());
}
}
4
package hanqi;
public class Vehicle {
private int wheels;
private int weight;
public int getWheels() {
return wheels;
}
public void setWheels(int wheels) {
this.wheels = wheels;
}
public int getWeight() {
return weight;
}
public void setWeight(int weight) {
this.weight = weight;
}
public Vehicle(int wheels,int weight)
{
this.weight=weight;
this.wheels=wheels;
}
}
package hanqi;
public class Car extends Vehicle{
private int loader;
public int getLoader() {
return loader;
}
public void setLoader(int loader) {
this.loader = loader;
}
public Car(int wheels, int weight,int loader)
{
super(wheels,weight);
this.loader=loader;
}
}
package hanqi;
public class Truck extends Car{
private int payload;
public int getPayload() {
return payload;
}
public void setPayload(int payload) {
this.payload = payload;
}
public Truck(int wheels, int weight, int loader, int payload)
{
super(wheels,weight,loader);
this.payload=payload;
}
}
package hanqi;
public class TestVehicle {
public static void main(String[] args) {
Vehicle a = new Vehicle(4,3);
System.out.println("a有："+a.getWheels()+"个轮子\t："+a.getWeight()+"吨重");
Car b= new Car(4,3,4);
System.out.println("b有："+b.getWheels()+"个轮子\t："+b.getWeight()+"吨重\t可以坐"+b.getLoader()+"个人");
Truck c= new Truck(6,10,5,10);
System.out.println("c有："+c.getWheels()+"个轮子\t："+c.getWeight()+"吨重\t可以坐"+c.getLoader()+"个人\t载重"+c.getPayload()+"吨");
}
}
