public class ex6 4 extends Applet TextField tfl=new TextField (20); TextArea tal=new TextArea(nu, 6, 40) public void initot add(tiD); add(taD) tfl. addTextlistener(new TextlO) class Text implements Textlistener t 点专此处结束放殃 4合public class Ex6_4 extends Applet{ TextField tf1=new TextField(20); TextArea ta1=new TextArea (null,6,40); public void init(){ add(tf1); add(ta1); tf1.addTextListener(new TextL()); } class TextL implements TextListener{