jtextfieldtest.java

SWING组件与布局管理器例子

/**
 *　JToggleButton按钮的测试
 */
import java.awt.Container;
import java.awt.Color;
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

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

/**
 *　这是定制自己的按钮框架
 */
class JTextFieldFrame extends JFrame
{
	private static final int WIDTH = 400;
	private static final int HEIGHT = 300;
	
	public JTextFieldFrame()
	{
		setSize(WIDTH, HEIGHT);//设置框架的大小		
		setTitle("文本域测试");//设置框架的标题
		
		Container con = getContentPane();//得到了内容窗格
		
		JPanel centerPanel = new JPanel();	
		JTextField textField = new JTextField("this is the initial text");
		centerPanel.add(textField);	
		
		JPanel buttonPanel = new ButtonPanel(textField, centerPanel);
		con.add(buttonPanel, BorderLayout.SOUTH);
		con.add(centerPanel, BorderLayout.CENTER);//将面板添加到内容窗格中
	}
}

class ButtonPanel extends JPanel
{
	private JTextField textField;
	private JPanel centerPanel;
		
	public ButtonPanel(JTextField textField, JPanel centerPanel)
	{
		this.textField = textField;
		this.centerPanel = centerPanel;
		JButton button = new JButton("change text");
		button.addActionListener(new ButtonAction());
		add(button);
		
	}
	
	class ButtonAction implements ActionListener
	{
		private boolean flag = true;
		public void actionPerformed(ActionEvent e)
		{
			if(flag)
			{
				textField.setText("this is the changed text");
				flag = false;
			}	else
			{
				textField.setText("this is the initial text");
				flag = true;
			}
			
			centerPanel.validate();//重新计算组件尺寸并重新绘制
		}
	}	
}