chardisplay.java

这是一个工厂模式的摸版程序

public class CharDisplay extends AbstractDisplay
{
	private char ch;
	public CharDisplay(char ch)
	{
		this.ch=ch;
  } 
  public void open()
  {
  	System.out.print("<<");
  }
  public void print()
  {
  	System.out.print(ch);
  }
  public void close()
  {
  	System.out.println(">>");
  }
}