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  • 第九次作业圆、电视机

    1
    
    package kk;
    
    public class circle {
         private double radius;
    
            // 构造方法,有参构造
            public circle(double radius) {
                this.radius = radius;
            }
            //方法的重载,参数不同
            // 构造方法,无参构造
            public circle() {
                this.radius = 1;
            }
    
            // 求圆面积的方法
            public double getArea() {
                return radius * radius * Math.PI;
    
            }
    
            // 求圆周长的方法
            public double getPerimeter() {
                return 2 * Math.PI * radius;
            }
            public void setRadius(double newRadius) {
                this.radius=newRadius;
            }
    }
    package kk;
    
    public class Dmc {
          public static void main(String[] args) {
                circle circle1=new circle();
                double area=circle1.getArea();
                System.out.println(area);
                circle circle2=new circle(10);
                System.out.println(circle2.getArea());
                System.out.println(circle1.getPerimeter());
                System.out.println(circle2.getPerimeter());
                double ridius=10;
                double areaCircle=Math.PI*ridius*ridius;
                System.out.println(areaCircle);
                circle2.setRadius(5);
                System.out.println(circle2.getArea());
                
            }
    }
    

      

    2
     
    package kk;
    
    public class Scircle {
         private double radius;
            public Scircle() {
                this.radius=1;
            }
            public Scircle(double radius){
                this.radius=radius;
            }
            public double getArea() {
                return Math.PI*radius*radius;
            }
            public double getPerimeter() {
                return 2*Math.PI*radius;
            }
            public static void main(String[] args) {
                Scircle cir1=new Scircle();
                System.out.println("The area of the circle of radius "+cir1.radius+" is "+cir1.getArea());
                Scircle cir2=new Scircle(10);
                System.out.println("The area of the circle of radius "+cir2.radius+" is "+cir2.getArea());
            }
    }
    

      

     3
     
     
     
    package kk;
    public class TV {
        public int channel=1;
        public int volumeLevel=1;
        public boolean on=false;
        public void turnOn() {
            on =true;
            System.out.println("地址为"+new TV());
            System.out.println("号的电视已经打开");
        }
        public void turnOff() {
            on=false;
            System.out.println("电视已经关闭");
        }
        public int getChannel() {
            return channel;
        }
        public void setChannel(int channel) {
            if(on) {
                System.out.println("电视机已开,可开始调台");
                if(channel>=1&&channel<=120) {
                    this.channel = channel;
                    System.out.println("频道已经调到 "+channel+" 号台");
                }else {
                    System.out.println("你要调的频道不存在");
                }
            }else {
                System.out.println("电视机关着的时候不能调台");
            }
        }
        public int getVolumeLevel() {
            return volumeLevel;
        }
        public void setVolumeLevel(int volumeLevel) {
            if(on) {
                System.out.println("电视机已开,声音大小可调");
                if(volumeLevel>=1&&volumeLevel<=7) {
                    this.volumeLevel = volumeLevel;
                    System.out.println("声音的大小设置成 "+volumeLevel);
                }
                else {
                    System.out.println("音量大小超过范围");
                }
            }else {
                System.out.println("电视机关着的时候不能调声音");
            }
            
        }
        public void channelUp() {
            if(on&&channel<120) {
                channel++;
            }
        }
        public void channelDown() {
            if(on&&channel>1) {
                channel--;
            }
        }
        public void volumeUp() {
            if(on&&volumeLevel<7) {
                volumeLevel++;
            }
        }
        public void volumeDown() {
            if(on&&volumeLevel>1) {
                volumeLevel--;
            }
        }
        
        
    }
    package kk;
    
    public class CTV {
         public static void main(String[] args) {
           TV tv1=new TV();
           tv1.turnOn();
           tv1.setChannel(77);
           tv1.setVolumeLevel(9);      
           TV tv2=new TV();
           tv2.turnOn();
           System.out.println("TV2's channel is "+tv2.channel+" and volume is "+tv2.volumeLevel);
           tv2.channelUp();
           System.out.println("TV2's channel is "+tv2.channel+" and volume is "+tv2.volumeLevel);
           tv2.channelUp();
           System.out.println("TV2's channel is "+tv2.channel+" and volume is "+tv2.volumeLevel);
           tv2.channelUp();
           System.out.println("TV2's channel is "+tv2.channel+" and volume is "+tv2.volumeLevel);
           tv2.volumeUp();
           System.out.println("TV2's channel is "+tv2.channel+" and volume is "+tv2.volumeLevel);
           tv2.volumeUp();
           System.out.println("TV2's channel is "+tv2.channel+" and volume is "+tv2.volumeLevel);
           tv2.volumeUp();
           System.out.println("TV2's channel is "+tv2.channel+" and volume is "+tv2.volumeLevel);
                 
       }
    
    }
    

      

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  • 原文地址:https://www.cnblogs.com/huiiuh/p/7825634.html
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