javapanel和button,java–JButton在JPanel上,它不应该

而不是setLayout(null),学习使用layouts对您有利.下面的示例使用一系列nested layouts在另一个网格中添加一个网格.

import java.awt.Color;

import java.awt.EventQueue;

import java.awt.GridBagLayout;

import java.awt.GridLayout;

import javax.swing.BorderFactory;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JRadioButton;

/**

* &＃64;see https://stackoverflow.com/a/36243395/230513

*/

public class Test {

private static final int ROW &＃61; 2;

private static final int COL &＃61; 5;

private void display() {

JFrame f &＃61; new JFrame("Test");

f.setLayout(new GridLayout(0, 1));

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JPanel top &＃61; new JPanel(new GridBagLayout());

top.setBackground(Color.darkGray);

JLabel label &＃61; new JLabel("Post no bills.");

label.setForeground(Color.yellow);

top.add(label);

f.add(top);

f.add(createGridPanel());

f.pack();

f.setLocationRelativeTo(null);

f.setVisible(true);

}

private JPanel createGridPanel() {

JPanel p &＃61; new JPanel(new GridLayout(ROW, COL, 5, 5));

p.setBorder(BorderFactory.createLineBorder(Color.yellow,5));

p.setBackground(Color.yellow);

for (int r &＃61; 0; r

for (int c &＃61; 0; c

p.add(createSubPanel());

}

}

return p;

}

private JPanel createSubPanel() {

JPanel p &＃61; new JPanel(new GridLayout(0, 1));

JPanel top &＃61; new JPanel();

top.add(new JButton("One"));

top.add(new JButton("Two"));

JPanel bot &＃61; new JPanel();

bot.add(new JRadioButton("A"));

bot.add(new JRadioButton("B"));

bot.add(new JRadioButton("C"));

bot.add(new JRadioButton("D"));

p.add(top);

p.add(bot);

return p;

}

public static void main(String[] args) {

EventQueue.invokeLater(new Test()::display);

}

}

附录&＃xff1a;“我想……下一个和后面两个JButton.”

要允许按钮从一个面板导航到另一个面板,请使用CardLayout,如here所示,并在下面进行修订.

import java.awt.BorderLayout;

import java.awt.CardLayout;

import java.awt.Color;

import java.awt.EventQueue;

import java.awt.GridBagLayout;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import javax.swing.AbstractAction;

import javax.swing.BorderFactory;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JRadioButton;

/**

* &＃64;see https://stackoverflow.com/a/36243395/230513

*/

public class CardPanel extends JPanel {

private static final JPanel cards &＃61; new JPanel(new CardLayout());

private final String name;

public CardPanel(String name) {

super(new GridLayout(0, 1));

this.name &＃61; name;

JPanel top &＃61; new JPanel(new GridBagLayout());

top.setBackground(Color.darkGray);

JLabel label &＃61; new JLabel(name);

label.setForeground(Color.yellow);

top.add(label);

JPanel bot &＃61; new JPanel();

bot.setBorder(BorderFactory.createLineBorder(Color.yellow, 5));

bot.add(new JRadioButton("A"));

bot.add(new JRadioButton("B"));

bot.add(new JRadioButton("C"));

bot.add(new JRadioButton("D"));

this.add(top);

this.add(bot);

}

&＃64;Override

public String toString() {

return name;

}

public static void main(String[] args) {

EventQueue.invokeLater(new Runnable() {

&＃64;Override

public void run() {

create();

}

});

}

private static void create() {

JFrame f &＃61; new JFrame();

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

for (int i &＃61; 1; i <9; i&＃43;&＃43;) {

CardPanel p &＃61; new CardPanel("Panel " &＃43; String.valueOf(i));

cards.add(p, p.toString());

}

JPanel control &＃61; new JPanel();

control.add(new JButton(new AbstractAction("⊲Prev") {

&＃64;Override

public void actionPerformed(ActionEvent e) {

CardLayout cl &＃61; (CardLayout) cards.getLayout();

cl.previous(cards);

}

}));

control.add(new JButton(new AbstractAction("Next⊳") {

&＃64;Override

public void actionPerformed(ActionEvent e) {

CardLayout cl &＃61; (CardLayout) cards.getLayout();

cl.next(cards);

}

}));

f.add(cards, BorderLayout.CENTER);

f.add(control, BorderLayout.SOUTH);

f.pack();

f.setLocationRelativeTo(null);

f.setVisible(true);

}

}