JTextArea范例

来源：互联网发布：美工刀片材料编辑：程序博客网时间：2024/04/29 07:51
import javax.swing.*;import java.awt.*;import java.awt.event.*;import java.io.*;public class TextArea1 implements ActionListener{JTextArea text;public static void main(String [] args){TextArea1 gui = new TextArea1();gui.go();}public void go(){JFrame frame = new JFrame();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);JPanel panel =new JPanel();JButton button = new JButton("Just Click It");button.addActionListener(this);text=new JTextArea(10,20);//10代表10行高，20代表20字宽text.setLineWrap(true);//启动自动换行JScrollPane scroller = new JScrollPane(text);//把text赋值给新建立的JScrollPane//指定只能使用垂直滚动条scroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);scroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);panel.add(scroller);//这很重要，加入的是带有文本域的滚动条而不是文本域frame.getContentPane().add(BorderLayout.CENTER,panel);frame.getContentPane().add(BorderLayout.SOUTH,button);frame.setSize(350,300);frame.setVisible(true);}public void actionPerformed(ActionEvent event){/*text.append("button clicked \n");//在按下按钮是插入一行换行字符，不然的话会粘在一起try{Thread.sleep(1000);}catch(Exception e){}text.setText("Not all who are lost are wandering");*///text.selectAll();//选取内容text.requestFocus();//把GUI目前焦点拉回到文本字段以便让用户进行输入操作}}
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