[英]How to add JPanel to JFrame from different classes
如何將JPanel添加到JFrame? 這讓我很困惑。 我想將JPanel添加到JFrame。 我已經嘗試了各種各樣的事情,包括擴展,但我無法讓它工作。
import javax.swing.JOptionPane;
import java.awt.Color;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class events {
public static void main (String args[]) {
Time timeObject = new Time();
JFrame mainJFrame;
mainJFrame = new JFrame();
mainJFrame.setLayout(BorderLayout());
mainJFrame.setVisible(true);
mainJFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainJFrame.setSize(600,400);
mainJFrame.setVisible(true);
mainJFrame.setLayout(new BorderLayout());
mainJFrame.setTitle("Travel Agent System");
mainJFrame.setBackground(Color.BLUE);
timeObject.selectButton();
}
}
import javax.swing.JOptionPane;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Time{
public static void selectButton()
JButton timeButton = new JButton("Time");
JButton moneyButton = new JButton("Money");
JButton hotelButton = new JButton("Hotel");
JButton exitButton = new JButton("Exit");
JPanel buttonPanel = new JPanel();
buttonPanel.setBackground(Color.RED);
buttonPanel.add(timeButton,moneyButtons,hotelButton,exitButton);
}
看看這個來源。 請注意評論。
import javax.swing.JOptionPane;
import java.awt.Color;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class events {
public static void main (String args[]) {
Time timeObject = new Time();
JFrame mainJFrame;
mainJFrame = new JFrame();
// Coding by magic!
//mainJFrame.setLayout(BorderLayout());
mainJFrame.setLayout(new BorderLayout());
mainJFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// don't do this, just call pack() later
//mainJFrame.setSize(600,400);
mainJFrame.setLayout(new BorderLayout());
mainJFrame.setTitle("Travel Agent System");
mainJFrame.setBackground(Color.BLUE);
timeObject.selectButton();
mainJFrame.add(timeObject.getGUI());
mainJFrame.pack();
// should be last.
mainJFrame.setVisible(true);
}
}
class Time {
private JPanel buttonPanel;
// don't use static unless necessary - it is not necessary.
//public static void selectButton() {
public void selectButton() {
JButton timeButton = new JButton("Time");
JButton moneyButton = new JButton("Money");
JButton hotelButton = new JButton("Hotel");
JButton exitButton = new JButton("Exit");
buttonPanel = new JPanel();
buttonPanel.setBackground(Color.RED);
buttonPanel.add(timeButton);
buttonPanel.add(moneyButton);
buttonPanel.add(hotelButton);
buttonPanel.add(exitButton);
}
public JComponent getGUI() {
return buttonPanel;
}
}
將JFrame對象傳遞給selectButton():
timeObject.selectButton(mainJFrame);
然后使用該JFrame對象向其添加JPanel。
public static void selectButton(JFrame frame)
{
JButton timeButton = new JButton("Time");
JButton moneyButton = new JButton("Money");
JButton hotelButton = new JButton("Hotel");
JButton exitButton = new JButton("Exit");
JPanel buttonPanel = new JPanel();
buttonPanel.setBackground(Color.RED);
buttonPanel.add(timeButton,moneyButtons,hotelButton,exitButton);
frame.getContentPane().add(buttonPanel,BorderLayout.CENTER); // i've added to CENTER.
}
這會將JPanel添加到JFrame的CENTER中。
這是一個很好的例子,它實現了一個JFrame類,然后將JPanels添加到JFrame和其他JPanels。
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