2.1
package my;
import java.awt.Container;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class SwingDemo
{
private static void createGUI()
{
// JFrame指一個視窗,構造方法的參數為視窗标題
MyFrame frame = new MyFrame("Swing Demo");
// 當關閉視窗時,退出整個程式 (照抄即可)
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// 設定視窗的其他參數,如視窗大小
frame.setSize(400, 300);
// 顯示視窗
frame.setVisible(true);
}
public static void main(String[] args)
{
// 此段代碼間接地調用了 createGUI()
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run()
{
createGUI();
}
});
}
}
繼承JFrame
package my;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class MyFrame extends JFrame
{
JLabel testLabel = new JLabel("Hello,World");
JButton button = new JButton("測試");
public MyFrame(String title)
{
super(title);
// 内容面闆 (ContentPane)
Container contentPane = getContentPane();
// 什麼叫 FlowLayout? 别管,這一行先照抄,直到第5章
contentPane.setLayout(new FlowLayout());
// 向内容面闆裡添加控件 , 如 JLabel, JButton
contentPane.add(testLabel);
contentPane.add(button);
}
}
簡潔寫法
package my;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class MyFrame extends JFrame
{
public MyFrame(String title)
{
super(title);
// 内容面闆 (ContentPane)
Container contentPane = getContentPane();
// 設定布局 FlowLayout
contentPane.setLayout(new FlowLayout());
// 向内容面闆裡添加控件 , 如 JLabel, JButton
contentPane.add(new JLabel("Hello,World"));
contentPane.add(new JButton("測試"));
}
}
控件、監聽器、時間表示的使用
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class MyFrame extends JFrame {
JLabel textlabel = new JLabel("Hello");
JButton button =new JButton("開始");
public MyFrame(String title) {
super(title);
Container contentPane = getContentPane();
contentPane.setLayout(new FlowLayout());
contentPane.add(textlabel);
contentPane.add(button);
MyButtonListener listener = new MyButtonListener();
button.addActionListener(listener);
}
public void showTime()
{
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
String timestr = sdf.format(new Date());
textlabel.setText( timestr );
}
private class MyButtonListener implements ActionListener
{
@Override
public void actionPerformed(ActionEvent e) {
// TODO 自動生成的方法存根
MyFrame.this.showTime();
System.out.println("點選");
}
}
}