基本上，我绘制了主要方法中的所有代码。我正在尝试创建一个开始菜单，所以我希望能够有一个方法（名为drawMenu），我可以运行以绘制井字游戏按钮。
更简短的解释，如何在此drawMenu方法中绘制此主要方法之外的按钮？
package myClass;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.util.HashMap;
import java.util.Map;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.tools.ToolProvider;
public class mainClass {
//Boolean switcher for playing/not
//Create panel sides for action listeners
enum ESide {
tleft, tmid, tright,
mleft, mmid, mright,
bleft, bmid, bright,
};
public static void main(String[] args) {
//Objects
//create window
JFrame mainWindow = new JFrame("Tic Tac Toe");
//properties of mainWindow
mainWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainWindow.setSize(600, 600); // buttons will fill entirely, 200x200 buttons
mainWindow.setLayout(new GridLayout(3, 3));
//create buttons
JButton startButton = new JButton("Start");
JButton topLeft = new JButton("");
JButton topMid = new JButton("");
JButton topRight = new JButton("");
JButton midLeft = new JButton("");
JButton midMid = new JButton("");
JButton midRight = new JButton("");
JButton botLeft = new JButton("");
JButton botMid = new JButton("");
JButton botRight = new JButton("");
//Definitions
final Map<ESide, Boolean> board = new HashMap<>();
for (ESide side : ESide.values()) {
board.put(side, false);
}
//Dimensions
Dimension selectionButtonSize = new Dimension(100,25);
Dimension buttonSize = new Dimension(200,200);
//Action listener
topLeft.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt)
{
if (board.get(ESide.tleft).booleanValue() == false) {
topLeft.setText("X");
board.put(ESide.tleft, true);
}
}
});
topMid.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt)
{
if (board.get(ESide.tmid).booleanValue() == false) {
topMid.setText("X");
board.put(ESide.tmid, true);
}
}
});
topRight.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt)
{
if (board.get(ESide.tright).booleanValue() == false) {
topRight.setText("X");
board.put(ESide.tright, true);
}
}
});
midLeft.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt)
{
if (board.get(ESide.mleft).booleanValue() == false) {
midLeft.setText("X");
board.put(ESide.mleft, true);
}
}
});
midMid.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt)
{
if (board.get(ESide.mmid).booleanValue() == false) {
midMid.setText("X");
board.put(ESide.mmid, true);
}
}
});
midRight.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt)
{
if (board.get(ESide.mright).booleanValue() == false) {
midRight.setText("X");
board.put(ESide.mright, true);
}
}
});
botLeft.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt)
{
if (board.get(ESide.bleft).booleanValue() == false) {
botLeft.setText("X");
board.put(ESide.bleft, true);
}
}
});
botMid.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt)
{
if (board.get(ESide.bmid).booleanValue() == false) {
botMid.setText("X");
board.put(ESide.bmid, true);
}
}
});
botRight.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt)
{
if (board.get(ESide.bright).booleanValue() == false) {
botRight.setText("X");
board.put(ESide.bright, true);
}
}
});
drawMenu();
mainWindow.setVisible(true); // draw it
}
public static void drawMenu() {
System.out.println("Drawing menu button");
//I want to be able to access the buttons to draw them here.
}
}
答案 0 :(得分：3)
建议：从当前的主要方法中获取所有内容。
而是创建一个符合OOP的类，它具有非静态实例JButton字段以及您需要的任何其他字段，在此类的构造函数中创建GUI，并使用main方法简单地创建此类的实例，放置它进入一个JFrame（如果它是一个JPanel，应该是它），然后将其设置为可见。这里的关键概念是使用面向对象技术，因为Java首先是面向对象的编程语言，通过这样做，您将减少当前的复杂性，尤其是未来的复杂性。
例如，
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.*;
@SuppressWarnings("serial")
public class SimpleTicTacToe extends JPanel {
private static final int SIDE = 3;
private static final float BTN_FONT_SIZE = 64f;
public static final Color X_COLOR = Color.RED;
public static final Color O_COLOR = Color.BLUE;
private boolean xTurn = true;
private JButton[][] buttonGrid = new JButton[SIDE][SIDE];
public SimpleTicTacToe() {
JPanel btnPanel = new JPanel(new GridLayout(SIDE, SIDE));
for (int i = 0; i < buttonGrid.length; i++) {
for (int j = 0; j < buttonGrid[i].length; j++) {
buttonGrid[i][j] = new JButton(new TicTacToeBtnAction());
buttonGrid[i][j].setFont(buttonGrid[i][j].getFont().deriveFont(Font.BOLD, BTN_FONT_SIZE));
btnPanel.add(buttonGrid[i][j]);
}
}
JPanel bottomPanel = new JPanel();
bottomPanel.add(new JButton(new ResetAction("Reset", KeyEvent.VK_R)));
setLayout(new BorderLayout());
add(btnPanel, BorderLayout.CENTER);
add(bottomPanel, BorderLayout.PAGE_END);
}
class TicTacToeBtnAction extends AbstractAction {
public TicTacToeBtnAction() {
super(" ");
}
@Override
public void actionPerformed(ActionEvent e) {
JButton btn = (JButton) e.getSource();
String btnText = btn.getText().trim();
if (!btnText.isEmpty()) {
return;
}
if (xTurn) {
btn.setForeground(X_COLOR);
btn.setText("X");
} else {
btn.setForeground(O_COLOR);
btn.setText("O");
}
xTurn = !xTurn;
}
}
private class ResetAction extends AbstractAction {
public ResetAction(String name, int mnemonic) {
super(name);
putValue(MNEMONIC_KEY, mnemonic);
}
@Override
public void actionPerformed(ActionEvent e) {
for (JButton[] jButtons : buttonGrid) {
for (JButton jButton : jButtons) {
jButton.setText("");
}
}
xTurn = true;
}
}
private static void createAndShowGui() {
SimpleTicTacToe mainPanel = new SimpleTicTacToe();
JFrame frame = new JFrame("Tic Tac Toe");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
createAndShowGui();
});
}
}
是的，正如FredK建议的那样 - 确保在Swing事件线程上启动所有Swing应用程序（如上所示）。