java派生类练习

//第七题
import java.util.*;
class Vehicle{
   protected int speed, kind;
   protected String color;
   Scanner cin=new Scanner(System.in);

   public Vehicle(int a){        //不带参数的构造方法
       kind=a;
       System.out.println("构造完成");
   }
   public void setSpeed(int a){
     speed=a;
   }
   
   public void setColor(String a)
   {
       color=a;
   }
   
   public void input()
   {
       System.out.println("输入速度：");
       int temp=cin.nextInt();
       setSpeed(temp);
       System.out.println("输入颜色：");
       String t=cin.next();
       setColor(t);
   }
    
   public int retKind(){
       return  kind;
   }
   
   public String retColor()
   {
       return color;
   }
   
   public int retSpeed(){
       return  speed;
   }
}

class Car extends Vehicle {     // Circle类继承Point类
       protected int passenger;
       public int retpass()
       {
           return passenger;
       }
       public void setPass()
       {
           
           System.out.println("座位数：");
           int t=cin.nextInt();
           
           passenger=t;
       }
       public void ret(){
             System.out.println("颜色："+this.retColor()+"\n类别："+this.retKind()+"\n座位数："+this.retpass()+"\n速度："+this.retSpeed());
           }
       public Car(){
         super(12345);           //引用父类带参数的构造方法 
         super.input();
         setPass();
         this.ret();

       }


    }
    public class Main{
       public static void main( String args[] ){
           Car test=new Car();
       }
    }


import java.util.*;
class Circle
{
    protected double x,y,r;
    
    public Circle()
    {
        System.out.println("构造完成");
    };
    public void setX(double a)
    {x=a;}
    
    public void setY(double a)
    {y=a;}
    
    public void setR(double a)
    {r=a;}
    
    public double retX()
    {return x;}
    
    public double retY()
    {return y;}
    
    public double retR()
    {return r;}
    
    public double area()
    {
        return 3.1415*r*r;
    }
    
    public double Perimeter()
    {
        return 2*3.1415*r;
    }
    
}
//第八题
class Cylinder extends Circle
{
    protected double h;
    Scanner cin=new Scanner(System.in);
    Cylinder()
    {
        System.out.println("构造完成");
    }
    public void input()
    {
        System.out.println("输入x");
        double temp=cin.nextDouble();
        super.setX(temp);
        
        System.out.println("输入y");
        temp=cin.nextDouble();
        super.setY(temp);
        
        System.out.println("输入r");
        temp=cin.nextDouble();
        super.setR(temp);
        
        System.out.println("输入h");
        temp=cin.nextDouble();
        setH(temp);
    }
    
    public void output()
    {
        System.out.println("输出x:"+super.retX());
        System.out.println("输出y:"+super.retY());
        System.out.println("输出r:"+super.retR());
        System.out.println("输出h:"+retH());
        System.out.println("输出圆柱表面积:"+area());
        System.out.println("输出圆柱体积"+volume());
    }
    
    public double retH()
    {return h;}
    
    public void setH(double a)
    {h=a;}
    
    public double area()
    {
        return 2*r*r*3.1415+2*3.1415*r*h;
    }
    
    public double volume()
    {
        return r*r*3.1415*h;
    }
}

public class Main{
    public static void main( String args[] ){
        Cylinder CC=new Cylinder();
        CC.input();
        CC.output();
    }
}