jtextareatest.java

SWING组件与布局管理器例子

/**
 *　文本区的测试
 */
import java.awt.Container;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class JTextAreaTest
{
	public static void main(String[] args)
	{
		JTextAreaFrame frame = new JTextAreaFrame();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.show();
	}
} 

/**
 *　这是定制自己的按钮框架
 */
class JTextAreaFrame extends JFrame
{
	private static final int WIDTH = 400;
	private static final int HEIGHT = 300;
	
	private JButton insertButton;
	private JButton wrapButton;
	private JTextArea textArea;
	private JPanel buttonPanel;
	private JScrollPane scrollPane;
	
	public JTextAreaFrame()
	{
		setSize(WIDTH, HEIGHT);//设置框架的大小		
		setTitle("文本区测试");//设置框架的标题
		
		Container con = getContentPane();//得到了内容窗格
				
		textArea = new JTextArea(10, 40);
		scrollPane = new JScrollPane(textArea);
				
		insertButton = new JButton("Insert Text");
		wrapButton = new JButton("Wrap");
		
		insertButton.addActionListener(new ActionListener(){
					public void actionPerformed(ActionEvent e)
					{
						textArea.append("this is the append text!!");
					}
				});
		
		wrapButton.addActionListener(new ActionListener(){
					public void actionPerformed(ActionEvent e)
					{
						boolean wrap = !textArea.getLineWrap();
						textArea.setLineWrap(wrap);
						wrapButton.setText(wrap ? "No Warp" : "Warp");
						scrollPane.validate();
					}
				});
		
		buttonPanel = new JPanel();
		buttonPanel.add(insertButton);
		buttonPanel.add(wrapButton);
	
		con.add(buttonPanel, BorderLayout.SOUTH);
		con.add(scrollPane, BorderLayout.CENTER);
	}
}