tv.java

Java面向对象编程(随书配套源代码) 阐述了面向对象编程的思想

package chapter7.remotecontrol;
import static java.lang.Math.max;
import static java.lang.Math.min;
public class TV implements IRemoteCtrl,IComputer
{
	private int VOLUME_MIN = 0;
	private int VOLUME_MAX = 100;
	private int CHANNEL_MIN = 0;
	private int CHANNEL_MAX = 999;
	private String make = ""; //厂家
	private boolean power = false;
	private int volume = VOLUME_MIN;
	private int channel = CHANNEL_MIN;

	public TV(String make )
	{
		this.make = make;
		//其它设置
	}	
	public boolean powerOnOff() 
	{
		this.power = !this.power;
		System.out.println(make + "电视电源：" + (this.power ? "开":"关") );
		return this.power;
	}
	public int volumeDown(int decrement) 
	{
		if(!this.power )return 0; //电源关闭，所以遥控信号均无效
		this.volume -=decrement;
		this.volume = max(this.volume ,VOLUME_MIN);//声音不能小于最小值
		System.out.println(make + "电视声音减小为：" + this.volume );
		return this.volume;
	}
	public int volumeUP(int increment) 
	{
		if(!this.power )return 0; //电源关闭，所以遥控信号均无效
		this.volume +=increment;
		this.volume = min(this.volume ,VOLUME_MAX);//声音不能大于最大值
		System.out.println(make + "电视声音放大为：" + this.volume );
		return this.volume;
	}
	public void mute()
	{
		if(!this.power )return ; //电源关闭，所以遥控信号均无效
		this.volume  =VOLUME_MIN;
		System.out.println(make + "电视处于静音状态" );
		return ;
	
	}
	public int channelDown()
	{
		if(!this.power )return 0; //电源关闭，所以遥控信号均无效
		this.channel = this.channel > CHANNEL_MIN ? --this.channel : CHANNEL_MAX;
		System.out.println(make + "电视频道设置为:" + this.channel );
		return this.channel;
	}
	public int channelUp() 
	{
		if(!this.power )return 0; //电源关闭，所以遥控信号均无效
		this.channel = this.channel < CHANNEL_MAX ? ++this.channel : CHANNEL_MIN;
		System.out.println(make + "电视频道设置为:" + this.channel );
		return this.channel;
	}	
	public int setChannel(int channel) 
	{
		if(channel > CHANNEL_MAX) this.channel = CHANNEL_MAX;
		else if(channel < CHANNEL_MIN)this.channel = CHANNEL_MIN;
		else  this.channel = channel;
		System.out.println(make + "电视频道设置为:" + this.channel );
		return this.channel;
	}
	
	public byte[] intputComputerSignal()
	{
		byte[] b = {1,0,0,1,1};
		//此处省略信号输入处理
		System.out.println(make + "从电脑获取如下信号：" + "Hello TV!");
		return b;
	}
	public void   outputTvSignal(byte[] b)
	{
		//此处省略信号输出处理
		System.out.println(make + "向电脑输入如下信号：" + "Hello computer!");
	}
	
}