1 package kk; public class circle { private double radius; // 構造方法,有參構造 public circle(double radius) { this.radius = radius; } //方法的重載，參數不同 ... ...
1
package kk;
public class circle {
private double radius;
// 構造方法,有參構造
public circle(double radius) {
this.radius = radius;
}
//方法的重載，參數不同
// 構造方法，無參構造
public circle() {
this.radius = 1;
}
// 求圓面積的方法
public double getArea() {
return radius * radius * Math.PI;
}
// 求圓周長的方法
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("地址為"+new TV());
System.out.println("號的電視已經打開");
}
public void turnOff() {
on=false;
System.out.println("電視已經關閉");
}
public int getChannel() {
return channel;
}
public void setChannel(int channel) {
if(on) {
System.out.println("電視機已開，可開始調台");
if(channel>=1&&channel<=120) {
this.channel = channel;
System.out.println("頻道已經調到 "+channel+" 號台");
}else {
System.out.println("你要調的頻道不存在");
}
}else {
System.out.println("電視機關著的時候不能調台");
}
}
public int getVolumeLevel() {
return volumeLevel;
}
public void setVolumeLevel(int volumeLevel) {
if(on) {
System.out.println("電視機已開，聲音大小可調");
if(volumeLevel>=1&&volumeLevel<=7) {
this.volumeLevel = volumeLevel;
System.out.println("聲音的大小設置成 "+volumeLevel);
}
else {
System.out.println("音量大小超過範圍");
}
}else {
System.out.println("電視機關著的時候不能調聲音");
}
}
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);
}
}
