applettest.java

递归子程序法：对应每个非终结符语法单元编一个独立的处理过程（或子程序）。语法分析从读入第一个单词开始

	package applettest;

	/** 
	 * Java语言实验参考程序
	 * Company 北京师范大学计算机系
 
	 * @author 孙一林
	 * @version 1.0
	 */
	import java.awt.*;
	import java.awt.event.*;
	import java.applet.*;
	public class AppletTest extends Applet {
          String s_KeyChar = "";										// 定义输入参数变量
	  public void paint(Graphics g){
	    g.drawString(s_KeyChar,20,20);
	  }

  public AppletTest() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  private void jbInit() throws Exception {
    this.addKeyListener(new java.awt.event.KeyAdapter() {
      public void keyPressed(KeyEvent e) {
        this_keyPressed(e);
      }
    });
  }

  void this_keyPressed(KeyEvent e) {
    s_KeyChar = String.valueOf(e.getKeyChar());
    repaint();
  }
}