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("电视机已经打开了。");
}
public void turnOff() {
on=false;
System.out.println("电视机已经关闭了。");
}
public int getChannel() {
return channel;
}
public void setChannel(int channel) {
if(on) {
System.out.println("电视机已开，可以开始调台了。");
if(channel>=1&&channel<=120) {
this.channel = channel;
System.out.println("频道已经调到 "+channel+" 台");
}else {
System.out.println("你要调的频道不存在。");
}
}else {
System.out.println("电视机关着的时候是不能调台的");
}
}
public int getVolumeLevel() {
return volumeLevel;
}
public void setVolumeLevel(int volumeLevel) {
if(on) {
System.out.println("电视机已开，声音大小可调了");
if(volumeLevel>=1&&volumeLevel<=7) {
this.volumeLevel = volumeLevel;
System.out.println("声音的大小设置成了 "+volumeLevel+" 大小");
}
}else {
System.out.println("电视机关着的时候是不能调声音的");
}
}
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--;
}
}
}
public class TestTV {
public static void main(String[] args) {
TV tv1=new TV();
tv1.turnOn();
tv1.setChannel(30);
tv1.setVolumeLevel(3);
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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1 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()); }} |
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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()); }} |
