textareademo.java

学习参考,java基本语法练习,包括一些常用的技巧

//该示例演示JTextArea和TextArea以及JScrollBar的使用
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class TextAreaDemo extends JFrame implements ActionListener
{
	TextArea taLeft;
	JTextArea jtaRight;
	JScrollPane jspRight;
	JButton btnInsert,btnReplace;
	JTextField txtContext;
	JPanel pnlMain;
	public TextAreaDemo()
	{
		btnInsert=new JButton("插入");
		btnInsert.addActionListener(this);
		btnReplace=new JButton("替换");
		btnReplace.addActionListener(this);
		txtContext=new JTextField(10);
		taLeft=new TextArea(7,12);
		taLeft.setText("这是TextArea");
		taLeft.append("\n常用方法演示！");
		taLeft.setSelectionStart(2);
		taLeft.setSelectionEnd (12);
		jtaRight=new JTextArea("这是JTextArea加水平和垂直滚动条",6,12);
		jspRight=new JScrollPane(jtaRight);
		pnlMain=new JPanel();
		pnlMain.add(taLeft);
		pnlMain.add(jspRight);
		pnlMain.add(txtContext);
		pnlMain.add(btnInsert);
		pnlMain.add(btnReplace);
		this.setContentPane(pnlMain);
		setTitle("JTextArea和TextArea示例");
		setSize(300,200);
		setVisible(true);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
	}
	public void actionPerformed(ActionEvent ae)
	{
		if (ae.getSource()==btnInsert)
			jtaRight.insert(txtContext.getText(),jtaRight.getRows());
		if (ae.getSource()==btnReplace){}
	}
	public static void main(String args[])
	{
		TextAreaDemo td=new TextAreaDemo();
	}
}