public class Circle { private double radius; public Circle(){ this.radius=1; } public Circle(double radius){ this.radius=radius; } publi ...
public class Circle { private double radius; public Circle(){ this.radius=1; } public Circle(double radius){ this.radius=radius; } public double getArea(){ return radius*radius*Math.PI; } public double getPerimeter(){ return 2*radius*Math.PI; } public void setRadius(double newRadius) { this.radius=newRadius; }}
public class Democirle { public static void main(String[] args) { // TODO 自动生成的方法存根 Circle circle1=new Circle(); System.out.println(circle1.getArea()); Circle circle2=new Circle(10); System.out.println(circle2.getArea()); Circle circle3=new Circle(); System.out.println(circle3.getPerimeter()); Circle circle4=new Circle(10); System.out.println(circle4.getPerimeter()); circle2.setRadius(2); System.out.println(circle2.getPerimeter()); }}
public class Simplecircle {private double radius; public Simplecircle(){ this.radius=1; } public Simplecircle(double radius){ this.radius=radius; } public double getArea(){ return radius*radius*Math.PI; } public double getPerimeter(){ return 2*radius*Math.PI; } public void setRadius(double newRadius) { this.radius=newRadius; } public static void main(String[] args) { // TODO 自动生成的方法存根 Circle circle1=new Circle(); System.out.println(circle1.getArea()); Circle circle2=new Circle(5); System.out.println(circle2.getArea()); Circle circle3=new Circle(); System.out.println(circle3.getPerimeter()); Circle circle4=new Circle(10); System.out.println(circle4.getPerimeter()); circle2.setRadius(2); System.out.println(circle2.getPerimeter()); }}
public class TestTV { public static void main(String[] args) { // TODO 自动生成的方法存根 TV tv1=new TV(); tv1.turnOn(); tv1.setChannel(6); tv1.setChannel(121); tv1.setVolumeLevel(5); tv1.setVolumeLevel(9); //tv1.turnOff(); //tv1.setChannel(6); //tv1.setVolumeLevel(5); TV tv2=new TV(); tv2.turnOn(); System.out.println("TV2's channel is "+tv2.channel+" and volume is "+tv2.volumeLevel); tv2.channelUp(); tv2.volumeUp(); System.out.println("TV2's channel is "+tv2.channel+" and volume is "+tv2.volumeLevel); }}
原标题:JAVA练习9
关键词:JAVA
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