stringdisplay.java

这是一个工厂模式的摸版程序

public class StringDisplay extends AbstractDisplay
{
	private String str;
	private int width;
	public StringDisplay(String str)
	{
		this.str=str;
		this.width=str.getBytes().length;
	}
	public void open()
	{
		printLine();
	}	
	public void print()
	{
		System.out.println("| "+str+" |");
	}
	public void close()
	{
		printLine();
	}	
	private void printLine()
	{
		System.out.print("+");
		for(int i=0;i<width+2;i++)
		{
			System.out.print("-");
		}
		System.out.println("+");
	}	
}