signallamp.java

软件测试和junit实践一书的源代码

/*
 * SignalLamp.java
 *
 * Created on 2003年4月18日, 下午4:04
 */

package com.fastpoint.book;

/**
 *
 * @author  Fastpoint
 */
public class SignalLamp implements Lamp {
    
    public static final String GREEN = "GREEN";
    public static final String RED = "RED";
    
    private String _stat;
    
    /** Creates a new instance of SignalLamp */
    public SignalLamp(){
       _stat = GREEN;
    }
    
    /** Creates a new instance of SignalLamp */
    public SignalLamp(String stat){
       _stat = stat;
    }
    
    public void setState(String stat){
       _stat = stat;
    }
    
    public String getState(){
       return _stat;
    }
    
    public void changeStat(Lamp lamp){
        if (this.getState().equals(lamp.getState())){
           if( lamp.getState().equals(RED)){
               lamp.setState(GREEN);
           }else if(lamp.getState().equals(GREEN)){
               lamp.setState(RED);
           }
        }
    }
}