java4android学习笔记(第22集)

 以下内容来自marschen的java4android视频教程.

第22集
主要内容.
1.被客户不断变化的需求"折磨".

class Printer{
	void open(){
		System.out.println("open");
	}
	 
	void close(){
		System.out.println("close");
	}
	
	void print(String s){
		System.out.println("print---->"+ s );
	}
	
	
	
} 

class HPPrinter extends Printer{
}
	
	

class CanonPrinter extends Printer{
	
	void close(){
		this.clean(); 
		super.close();
	}
	
	void clean()
	{
		System.out.println("clean.................");
	}
}
	
	

class TestPrinter{
	public static void main(String args[]){
		int flag =1;
		
		
		
		if( flag==0)
		{  
			HPPrinter Hprinter = new HPPrinter();
			Hprinter.open();
			Hprinter.print("abcdefg");
			Hprinter.close();
		}
		else if(flag==1)
		{
			CanonPrinter canonprinter = new CanonPrinter();
		    canonprinter.open();
		 	canonprinter.print("abcdefg");
			canonprinter.close();	
		}
	}
	
}