[英]Java swing; How to toggle panel's visibility?
我做了这个代码,通过按钮导航到panel1和panel2。
(button1和button2)但是当我运行我的代码时,框架保持为空。
有人可以解释一下我做错了什么,以及我如何能够完成
以这种方式在panel1和panel2之间切换? 首先从panel1开始
码:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JFrame;
public class togglepanel {
public static void main(String[] args) {
final JFrame frame = new JFrame();
final JPanel panel1 = new JPanel();
final JPanel panel2 = new JPanel();
JButton button1 = new JButton("previous frame!");
JButton button2 = new JButton("next frame");
frame.setLocationRelativeTo(null);
frame.setResizable(true);
frame.setVisible(true);
frame.setSize(600, 400);
frame.add(panel1);
frame.add(panel2);
panel1.add(button2);
panel1.setVisible(true);
panel2.add(button1);
panel2.setVisible(false);
button1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
panel1.setVisible(true);
panel2.setVisible(false);
}
});
button2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
panel1.setVisible(false);
panel2.setVisible(true);
}
});
}
}
提前致谢
使用布局管理器。
frame.setLayout(new FlowLayout());
另一种有用的方法,我认为更好的是使用CardLayout并将两个JPanels添加到使用此CardLayout的容器中。 然后,您可以通过调用CardLayout方法轻松交换视图。
例如,
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TogglePanel {
public static void main(String[] args) {
final CardLayout cardlayout = new CardLayout();
final JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final Container contentPane = frame.getContentPane();
contentPane.setLayout(cardlayout);
final JPanel panel1 = new JPanel();
final JPanel panel2 = new JPanel();
JButton button1 = new JButton("previous frame!");
JButton button2 = new JButton("next frame");
contentPane.setPreferredSize(new Dimension(600, 400));
contentPane.add(panel1, "Panel 1");
contentPane.add(panel2, "Panel 2");
frame.pack();
frame.setLocationRelativeTo(null);
frame.setResizable(true);
frame.setVisible(true);
panel1.add(button2);
panel2.add(button1);
ActionListener btnListener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
cardlayout.next(contentPane);
}
};
button1.addActionListener(btnListener);
button2.addActionListener(btnListener);
}
}
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