我怀疑问题在于您如何调用这个新窗口，也许您有一个无限循环或其他一些结构会冻结 Swing 事件调度线程或 EDT，从而使您的 GUI 无响应。如果您能创建并发布一个SSCCE 供我们编译、测试、运行以及可能的修改和更正，我们会非常清楚。
在我看来，您的代码还有其他重要但与您的主要问题无关的问题：
- 不应在应使用 JOptionPanes 或 JDialogs 等对话框的地方使用 JFrame。
- 应避免使用绝对定位，而应使用布局管理器。
- 您应该努力创建符合 Java 命名标准的代码，包括以大写字母开头的类名称。当要求他人阅读和理解您的代码并为您提供帮助时，这一点变得尤为重要。
例如一些快速制作的示例代码：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
@SuppressWarnings("serial")
public class TestNewMap extends JPanel {
private MapBox mapBox = new MapBox();
private NewMap newMap = new NewMap(this);
private HoverNewMap hoverNewMap = new HoverNewMap();
public TestNewMap() {
JPanel btnPanel = new JPanel(new GridLayout(1, 0, 5, 0));
btnPanel.add(new JButton(new AbstractAction("Show Your NewMap") {
@Override
public void actionPerformed(ActionEvent evt) {
newMap.setVisible(true);
}
}));
btnPanel.add(new JButton(new AbstractAction("Show Hover's NewMap") {
@Override
public void actionPerformed(ActionEvent evt) {
hoverNewMap.setMapWidth(mapBox.getWidthValue());
hoverNewMap.setMapHeight(mapBox.getHeightValue());
Object[] options = { "Create Map", "Cancel" };
Object initialValue = options[0];
int result = JOptionPane.showOptionDialog(TestNewMap.this,
hoverNewMap, "Get Map Dimensions",
JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null,
options, initialValue);
if (result == 0) {
try {
int w = hoverNewMap.getMapWidth();
int h = hoverNewMap.getMapHeight();
mapBox.create(w, h);
} catch (NumberFormatException e) {
JOptionPane.showMessageDialog(TestNewMap.this,
"Please only enter int values", "Non-int Input Error",
JOptionPane.ERROR_MESSAGE);
hoverNewMap.setMapHeight(0);
hoverNewMap.setMapWidth(0);
}
}
}
}));
int borderGap = 5;
setBorder(BorderFactory.createEmptyBorder(borderGap, borderGap,
borderGap, borderGap));
setLayout(new BorderLayout(borderGap, borderGap));
add(btnPanel, BorderLayout.NORTH);
add(mapBox, BorderLayout.CENTER);
}
private static void createAndShowGui() {
TestNewMap mainPanel = new TestNewMap();
JFrame frame = new JFrame("TestNewMap");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
private class MapBox extends JPanel {
private static final int INIT_WIDTH = 12;
private static final int INIT_HEIGHT = 8;
private JTextField widthField = new JTextField(
String.valueOf(INIT_WIDTH), 5);
private JTextField heightField = new JTextField(
String.valueOf(INIT_HEIGHT), 5);
public MapBox() {
add(new JLabel("Width:"));
add(widthField);
add(Box.createHorizontalStrut(10));
add(new JLabel("Height:"));
add(heightField);
}
public void create(int width, int height) {
widthField.setText(String.valueOf(width));
heightField.setText(String.valueOf(height));
}
public int getWidthValue() {
return Integer.parseInt(widthField.getText());
}
public int getHeightValue() {
return Integer.parseInt(heightField.getText());
}
}
private class HoverNewMap extends JPanel {
private JTextField mapWidth = new JTextField(5);
private JTextField mapHeight = new JTextField(5);
public HoverNewMap() {
add(new JLabel("Width:"));
add(mapWidth);
add(Box.createHorizontalStrut(15));
add(new JLabel("Height:"));
add(mapHeight);
setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
}
public void setMapWidth(int w) {
mapWidth.setText(String.valueOf(w));
}
public void setMapHeight(int h) {
mapHeight.setText(String.valueOf(h));
}
public int getMapWidth() throws NumberFormatException {
int w = Integer.parseInt(mapWidth.getText());
return w;
}
public int getMapHeight() throws NumberFormatException {
int h = Integer.parseInt(mapHeight.getText());
return h;
}
}
private class NewMap extends JFrame implements ActionListener {
JLabel wlbl = new JLabel("Map width: ");
JTextField w = new JTextField("12");
JLabel hlbl = new JLabel("Map height: ");
JTextField h = new JTextField("8");
JButton create = new JButton("Create map");
public NewMap(Component p) {
super("New Map");
setSize(100, 75);
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
setResizable(false);
setLayout(null);
// setVisible(true);
int bw = 96, bh = 24, s = 4, x = s;
wlbl.setBounds(x, s, bw, bh);
x += s + bw;
add(wlbl);
w.setBounds(x, s, bw, bh);
x += s + bw;
add(w);
hlbl.setBounds(x, s, bw, bh);
x += s + bw;
add(hlbl);
h.setBounds(x, s, bw, bh);
x += s + bw;
add(h);
create.setBounds(x, s, bw, bh);
x += s + bw;
create.addActionListener(this);
add(create);
setSize(getWidth() - this.getContentPane().getWidth() + x, getHeight()
- this.getContentPane().getHeight() + s + s + bh);
setLocationRelativeTo(p);
}
public void actionPerformed(ActionEvent e) {
try {
mapBox.create(Integer.parseInt(w.getText()),
Integer.parseInt(h.getText()));
} catch (NumberFormatException ex) {
return;
}
dispose();
}
}
}