Java Swing-使用JTextfield输入创建GridLayout
我正在尝试创建一个Java Swing-使用JTextfield输入创建GridLayout,java,swing,grid-layout,illegalargumentexception,Java,Swing,Grid Layout,Illegalargumentexception,我正在尝试创建一个Gridlayout。我使用了两个参数-m和n，它们取自JTextField组件 import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; public class GUI extends JFrame { public static final int HEIGHT = 75; public static
GridlayoutJTextFieldimport javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class GUI extends JFrame
{
public static final int HEIGHT = 75;
public static final int WIDTH = 450;
JLabel m_label, n_label;
JTextField m_enter,n_enter;
JButton generate;
int m,n;
GUI g;
public void draw()
{
m=Integer.parseInt(m_enter.getText());
n=Integer.parseInt(n_enter.getText());
new Chess();
}
GUI()
{
setPreferredSize(new Dimension(WIDTH,HEIGHT));
setLayout(new FlowLayout());
setVisible(true);
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setResizable(false);
m_label = new JLabel("M:");
m_enter = new JTextField(5);
n_label = new JLabel("N:");
n_enter = new JTextField(5);
generate = new JButton("Generate!");
add(m_label);
add(m_enter);
add(n_label);
add(n_enter);
add(generate);
pack();
generate.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
draw();
}
});
}
public static void main(String[] args)
{
new GUI();
}}
import javax.swing.*;
import java.awt.*;
class Chess extends JDialog
{
GUI g;
public static final int HEIGHT = 600;
public static final int WIDTH = 600;
int m,n;
Chess()
{
setPreferredSize(new Dimension(WIDTH,HEIGHT));
setVisible(true);
setLayout(new GridLayout(m,n));
pack();
}
}
Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: rows and cols cannot both be zero
at java.awt.GridLayout.<init>(GridLayout.java:195)
at java.awt.GridLayout.<init>(GridLayout.java:166)
at Chess.<init>(Chess.java:15)
at GUI.draw(GUI.java:23)
at GUI$1.actionPerformed(GUI.java:55)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6535)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6300)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4891)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2750)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
退出代码为0的过程已结束。您的问题是，您从未设置国际象棋的m或n值。给Chess一个构造函数，允许外部类设置这些字段，然后将它们传入
Chess(int m, int n) {
this.m = m;
this.n = n;
//if statement to check if NULL or both set to zero
//{
//TODO: Check to make sure no NULLs or Zero values
//}
setPreferredSize(new Dimension(WIDTH,HEIGHT));
setVisible(true);
setLayout(new GridLayout(m,n));
pack();
}
- 编程中没有“魔力”。你的字段不会神奇地改变，如果你想改变它们，程序员必须改变它们
- 不要忽略您收到的异常stacktrace消息，因为它包含有助于您解决问题的重要信息，包括问题所在的位置和问题所在的位置
- 您的问题最初是不可回答的，因为您没有发布导致错误的关键代码（请参见上面的要点）。请查看，以及部分，以了解有关如何改进您未来的问题并增加您获得体面帮助的机会的更多信息
Chess(int m, int n) {
this.m = m;
this.n = n;
//if statement to check if NULL or both set to zero
//{
//TODO: Check to make sure no NULLs or Zero values
//}
setPreferredSize(new Dimension(WIDTH,HEIGHT));
setVisible(true);
setLayout(new GridLayout(m,n));
pack();
}
- 编程中没有“魔力”。你的字段不会神奇地改变，如果你想改变它们，程序员必须改变它们
- 不要忽略您收到的异常stacktrace消息，因为它包含有助于您解决问题的重要信息，包括问题所在的位置和问题所在的位置
- 您的问题最初是不可回答的，因为您没有发布导致错误的关键代码（请参见上面的要点）。请查看，以及部分，以了解有关如何改进您未来的问题并增加您获得体面帮助的机会的更多信息
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