11.6第11次作业

电视机 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;}
}

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());}
}

//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 stubreturn 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

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);}}

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！");}}
};

转载于:https://www.cnblogs.com/kally004/p/7825728.html

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