Java第三次作业
package LHB.inherit; import java.util.*; class Monkey { String s; public Monkey(String s) { this.s=s; } public void speak() { System.out.println("好嗨哟！"); } } class People extends Monkey { public People(String s) { super(s); } public void speak() { System.out.println("刘海哥"); } public void think() { System.out.println("王大姐"); } } public class E { public static void main(String[] args) { Scanner in=new Scanner(System.in); String s; s=in.next(); Monkey p=new Monkey(s); People q=new People(s); p.speak(); q.speak(); q.think(); } }
package LHB.inherit;
import java.util.*;
class Monkey
{ String s;
public Monkey(String s)
{
this.s=s;
}
public void speak()
{
System.out.println("好嗨哟！");
}
}
class People extends Monkey
{
public People(String s) {
super(s);
}
public void speak()
{
System.out.println("刘海哥");
}
public void think()
{
System.out.println("王大姐");
}
}
public class E
{
public static void main(String[] args)
{
Scanner in=new Scanner(System.in);
String s;
s=in.next();
Monkey p=new Monkey(s);
People q=new People(s);
p.speak();
q.speak();
q.think();
}
}
2.按要求编写一个Java应用程序：
（1）定义一个类，描述一个矩形，包含有长、宽两种属性，和计算面积方法。
（2）编写一个类，继承自矩形类，同时该类描述长方体，具有长、宽、高属性，和计算体积的方法。
import java.util.*;
class Rectangle
{
int length,width;
public int area(int length,int width)/*矩形面积*/
{
this.length=length;
this.width=width;
int s;
s=length*width;
return s;
}
}
class Cuboid extends Rectangle
{
int length,width,heigth;
public Cuboid(int length,int width,int heigth)
{
this.length=length;
this.width=width;
this.heigth=heigth;
}
public int area()/*长方体底面积*/
{
int s;
s=length*width;
return s;
}
public int Volume()/*长方体体积*/
{
int v;
v=area()*heigth;
return v;
}
}
public class Test
{
public static void main(String[] args)
{
int length,width,heigth;
Scanner in=new Scanner(System.in);
System.out.print("请输入长宽高：");
length=in.nextInt();
width=in.nextInt();
heigth=in.nextInt();
Rectangle p=new Rectangle();
Cuboid q=new Cuboid(length,width,heigth);
System.out.println("矩形的面积是："+p.area(length, width));
System.out.println("长方体的体积是："+q.Volume());
}
}
3.编写一个Java应用程序，设计一个汽车类Vehicle，包含的属性有车轮个数wheels和车重weight。小车类Car是Vehicle的子类，其中包含的属性有载人数loader。卡车类Truck是Car类的子类，其中包含的属性有载重量payload。每个类都有构造方法和输出相关数据的方法。最后，写一个测试类来测试这些类的功能
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();
}
}
2.按要求编写一个Java应用程序：
（1）定义一个类，描述一个矩形，包含有长、宽两种属性，和计算面积方法。
（2）编写一个类，继承自矩形类，同时该类描述长方体，具有长、宽、高属性，和计算体积的方法。
import java.util.*; class Rectangle { int length,width; public int area(int length,int width)/*矩形面积*/ { this.length=length; this.width=width; int s; s=length*width; return s; } } class Cuboid extends Rectangle { int length,width,heigth; public Cuboid(int length,int width,int heigth) { this.length=length; this.width=width; this.heigth=heigth; } public int area()/*长方体底面积*/ { int s; s=length*width; return s; } public int Volume()/*长方体体积*/ { int v; v=area()*heigth; return v; } } public class Test { public static void main(String[] args) { int length,width,heigth; Scanner in=new Scanner(System.in); System.out.print("请输入长宽高："); length=in.nextInt(); width=in.nextInt(); heigth=in.nextInt(); Rectangle p=new Rectangle(); Cuboid q=new Cuboid(length,width,heigth); System.out.println("矩形的面积是："+p.area(length, width)); System.out.println("长方体的体积是："+q.Volume()); } }
3.编写一个Java应用程序，设计一个汽车类Vehicle，包含的属性有车轮个数wheels和车重weight。小车类Car是Vehicle的子类，其中包含的属性有载人数loader。卡车类Truck是Car类的子类，其中包含的属性有载重量payload。每个类都有构造方法和输出相关数据的方法。最后，写一个测试类来测试这些类的功能
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(); } }
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