writelettertextarea.java

JAVA网络编程电子书及源码

package gui;

import java.awt.*;
/**
 * 在这里插入类型说明。
 * 建立日期：(00-8-10 9:58:54)
 * @程序设计者：
 */
public class WriteLetterTextArea extends Frame {
	public TextArea textarea1;
	public TextField textfield1,textfield2;
	public Label label1;
	Panel panel1;
/**
 * WriteLetterTextArea 构造子注释。
 */
public WriteLetterTextArea() {
	setBackground(Color.lightGray);
	setForeground(Color.black);
	setFont(new Font("Helvetica",Font.PLAIN,14));
	setTitle("Write Letter");
	setLayout(new BorderLayout(0,10));
	textfield1=new TextField("receiver",10);
	textfield1.selectAll();
	textfield2=new TextField("topic",10);
	textfield2.selectAll();
	textarea1=new TextArea("dear  ",20,40); 
	for (int i=10;i<25;i++)
	textarea1.append("\n"); 
	textarea1.append("\t\t\tMerry  Christmas!");
	textarea1.append("\n\t\t\t\t   yours louis");
	textarea1.append("\n\t\t\t\t\t  [e-mail]");
	label1=new Label("The character bytes: ");
	panel1=new Panel();
	panel1.setLayout(new BorderLayout(0,10));
	panel1.add(textfield2,"North");
	panel1.add(textfield1,"South");
	add(panel1,"North");
	add(textarea1,"Center");
	add(label1,"South");
	pack();
	show();
}
/**
 * WriteLetterTextArea 构造子注释。
 * @param title java.lang.String
 */
public WriteLetterTextArea(String title) {
	super(title);
}
/**
 * 在这里插入方法说明。
 * 建立日期：(00-8-10 10:35:13)
 * @return boolean
 * @param evt java.awt.Event
 */
public boolean handleEvent(Event evt) {
	if (evt.id==Event.WINDOW_DESTROY){
		dispose();
		return true;
	}
	if (evt.id==Event.GOT_FOCUS){
	   if (evt.target==textarea1){
	   String count=null;
	   count=textarea1.getText();
	   label1.setText("The character bytes: "+count.length()) ;
	   return true;
	   }
	}
	if (evt.id==Event.KEY_PRESS){
	   String count=null;
	   count=textarea1.getText();
	   label1.setText("The character bytes: "+count.length()) ;
	   return false;   
	}
	return super.handleEvent(evt);
}
/**
 * 启动该应用程序。
 * @param args 命令行参数数组
 */
public static void main(java.lang.String[] args) {
	 new WriteLetterTextArea();
}
}