11.6作业 电视机和圆

//1.
//例题9.1 制作圆类，根据圆的半径求出周长及面积

package com.atlu;
//抽象的方法构成类，把属性和方法进行封装

public class Circle {
  // 两个方面一个是字段也称属性，另一个是方法，也称实现的功能
  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 com.atlu;

public class DemoCircle {
    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.

//作业2：把上边的两个圆的类合并成一个类，并实现同样功能

package com.atlu;

public class SimpleCircle {
    private double radius;
    public SimpleCircle() {
        this.radius=1;
    }
    public SimpleCircle(double radius){
        this.radius=radius;
    }
    public double getArea() {
        // TODO Auto-generated method stub
        return Math.PI*radius*radius;
    }
    public double getPerimeter() {
        return 2*Math.PI*radius;
    }
    
    public static void main(String[] args) {
        SimpleCircle cir1=new SimpleCircle();
        System.out.println("The area of the circle of radius "+cir1.radius+" is "+cir1.getArea());
        System.out.println("The perimeter of the circle of radius "+cir1.radius+" is "+cir1.getPerimeter());
        SimpleCircle cir2=new SimpleCircle(10);
        System.out.println("The area of the circle of radius "+cir2.radius+" is "+cir2.getArea());
        System.out.println("The perimeter of the circle of radius "+cir2.radius+" is "+cir2.getPerimeter());
    }
}

//3.

//例题9.3 造一台电视机，并且实现调频道和调声音大小功能

package com.atlu;

public class TV {
    
    public int channel=1;
    public int volumeLevel=1;
    public boolean on=false;
    
    public TV() {
        
    }
    public void turnOn() {
        on =true;
        System.out.println("叮咚！");
    }
    public void turnOff() {
        on=false;
        System.out.println("呜呜！");
    }
    public int getChannel() {
        return channel;
    }
    public void setChannel(int channel) {
        if(on) {
            System.out.println("你想看啥！");
            if(channel>=1&&channel<=120) {
                this.channel = channel;
                System.out.println("卡到 "+channel+" 台了！");
            }else {
                System.out.println("信号大概去外星球了！！");
            }
        }else {
            System.out.println("滋滋！");
        }
    }
    public int getVolumeLevel() {
        return volumeLevel;
    }
    public void setVolumeLevel(int volumeLevel) {
        if(on) {
            System.out.println("想让我大点声说话吗，偏不，哈哈！");
            if(volumeLevel>=1&&volumeLevel<=7) {
                this.volumeLevel = volumeLevel;
                System.out.println("已经 "+volumeLevel+" 大小说话了啊。");
            }
        }else {
            System.out.println("咔咔！");
        }
        
    }
    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--;
        }
    }
    
    
}

//测试电视机的类

package com.atlu;

public class TestTv {

    public static void main(String[] args) {
        TV tv1=new TV();
        tv1.turnOff();
        tv1.setChannel(30);
        tv1.setVolumeLevel(3);
        
        TV tv2=new TV();
        tv2.turnOn();
        tv2.setChannel(130);
//        tv2.setVolumeLevel(3);
        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);
       
        
    }

}

//4.

package com.atlu;

public class StaticDemo {
    public static void main(String args[]){
        new StaticDemo().fun();
    }
    public void fun(){
                System.out.println("Hello World!!!");
    }

}

//5.

package com.atlu;
public class DemoPerson {
    private String name;
    private int age;

public DemoPerson(String name,int age){
    this.name=name;
    this.age=age;
}
public boolean compare(DemoPerson1 per){
    if(this.name.equals(per.name)&&this.age==per.age){
        return true;
    }else{
        return false;
    }
}
public String getName(){
    return this.name;
}
public int getAge(){
    return this.age;
}


    public static void main(String args[]){
        DemoPerson1 per1=new DemoPerson1("张三",30);
        DemoPerson1 per2=new DemoPerson1("张三",30);
        if(per1.compare(per2)){
            System.out.println("是同一个人！");
        }
    }
};

//6.

package com.atlu;
public class DemoPerson1 {
    String name;
    int age;

public DemoPerson1(String name,int age){
    this.name=name;
    this.age=age;
}
public boolean compare(DemoPerson1 per){
    if(this==per){//地址相等
        return true;
    }
    if(this.name.equals(per.name)&&this.age==per.age){
        return true;
    }else{
        return false;
    }
}
public String getName(){
    return this.name;
}
public int getAge(){
    return this.age;
}


    public static void main(String args[]){
        DemoPerson1 per1=new DemoPerson1("张三",30);
        DemoPerson1 per2=new DemoPerson1("张三",30);
        if(per1.compare(per2)){
            System.out.println("是同一个人！");
        }
    }
};

 

 

//7.

package com.atlu;
class DemoPerson2{
    private String name;
    private int age;
    public DemoPerson2(String name,int age){
        this.name=name;
        this.age=age;
    }
    public void fun(DemoPerson2 temp){
        temp.name="李四";
        temp.age=33;
    }
    public String getName(){
        return this.name;
    }
    public int getAge(){
        return this.age;
    }

    public static void main(String args[]){
        DemoPerson2 per=new DemoPerson2("张三",30);
        per.fun(per);{
            System.out.println(per.getName()+"-->"+per.getAge());
        }
    }
}

 //8.

package com.atlu;
    class DemoPerson3{
        private String name;
        private int age;
    public DemoPerson3(String name,int age){
            this.name=name;
            this.age=age;
        }
    public String getName(){
        return this.name;
    }
    public int getAge(){
        return this.age;
    }
    public static void main(String args[]){
        DemoPerson3 per1=new DemoPerson3("张三",30);
        DemoPerson3 per2=new DemoPerson3("张三",30);
        if(per1.getName().equals(per2.getName())&&per1.getAge()==per2.getAge()){
            System.out.println("是同一个人！");
        }
    }
};