第三次作业

package JavaPractice;
class Monkey {
private String s; 
public Monkey() {
} 
public Monkey(String s) {
this.s=s; 
}
public String getS() { 
return s; } 
public void speak() { 
System.out.println("咿咿呀呀......"); 
} 
} 
class People extends Monkey { 
public void speak() { 
System.out.println("很不错滴！长大了！"); 
} 
public void think() {
System.out.println("请认真思考！");
} 
} 
public class E { 
public static void main(String[] args) { 
Monkey m=new Monkey(); 
People p=new People(); 
m.speak(); 
p.speak(); 
p.think(); 
}
}
第二题：
package JavaPractice; 
import java.util.Scanner; 
class Rectangle { 
private double length; 
private double width; 
public double getLength() { 
return length; } 
public double getWidth() { 
return width; } 
public Rectangle(double length, double width) { 
this.length = length; 
this.width = width; } 
public double getArea() { 
return length*width; } 
} 
class Cuboid extends Rectangle {
private double height; 
public double getHeight() { 
return height; 
} 
public Cuboid(double length, double width, double height) { 
super(length, width);
this.height = height; 
} 
public double getVolume() { 
return getLength()*getWidth()*height; 
} 
} 
public class TestPattern { 
public static void main(String[] args) { 
Scanner sc=new Scanner(System.in); 
System.out.println("请分别输入长方形的长、宽："); 
Rectangle rc=new Rectangle(sc.nextDouble(),sc.nextDouble());
System.out.println("长方形的面积为："+rc.getArea()); System.out.println(); 
System.out.println("请分别输入长方体的长、宽、高："); 
Cuboid cb=new Cuboid(sc.nextDouble(),sc.nextDouble(),sc.nextDouble()); System.out.println("长方体的底面积为："+cb.getArea()); System.out.println("长方体的体积为："+cb.getVolume()); 
}
}
第三题：
package LHB.inherit;
import java.util.*;
class Vehicle
{
int wheels,weight;/*车轮个数，车重*/
public Vehicle(int wheels,int weight)
{
this.wheels=wheels;
this.weight=weight;
}
public void print()
{
System.out.println("车轮个数是："+wheels+"个\n"+"车重是："+weight);
}
}
class Car extends Vehicle
{
int loader;/*车载人数*/
public Car(int wheels, int weight,int loader)
{ 
super(wheels, weight);
this.loader=loader;
}
public void print()
{
System.out.println("车载人数是："+loader);
}
}
class Truck extends Car
{
int payload;/*载重量*/
public Truck(int wheels, int weight, int loader,int payload) 
{
super(wheels, weight, loader);
this.payload=payload;
}
public void print()
{
System.out.println("载重量是："+payload);
}
}
public class Testcar 
{

public static void main(String[] args)
{
Scanner in=new Scanner(System.in);
int wheels,weight,loader,payload;
System.out.print("请输入车轮个数，车重，车载人数，载重量：");
wheels=in.nextInt();
weight=in.nextInt();
loader=in.nextInt();
payload=in.nextInt();
Vehicle p1=new Vehicle(wheels,weight);
Car p2=new Car(wheels,weight,loader);
Truck p3=new Truck(wheels,weight,loader,payload);
p1.print();
p2.print();
p3.print();
}

}