textareamethodprg_1.java

java练习程序

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class TextAreaMethodprg_1 extends Applet implements TextListener
{
  TextArea text1,text2;
  int i=0;
  TextField text3,text4;
  public void init()
  {
  	text1=new TextArea(" ",10,10);
  	text2=new TextArea(" ",10,10);
  	text3=new TextField(10);
  	add(text1);
  	add(text2);
  	add(text3);
  	text1.addTextListener(this);
  	text3.setText("no word");// add myself
/*  	text2.addActionListener(this);
  	text4=new TextField(30);// add myself
  	add(text4);// add myself
  	text4.setEditable(false);// add myself
  	text4.setText("enter: boy girl sun");// add myself
*/
  }
  public void textValueChanged(TextEvent e)
  {
  	// remember to press enter key
  	if(e.getSource()==text1)
   	{
   		//i++;
   		i=text1.getText().length();
   		text2.setText(text1.getText());
   		text3.setText(String.valueOf(i));
   	}else
   	{
   		text3.setText("no word");
   	}
  }
}