线程中的java异常";AWT-EventQueue-0“;java.lang.IllegalArgumentException
我在JavaSwing中尝试我的第一个代码,但遇到了很多错误。我的代码是:线程中的java异常";AWT-EventQueue-0“;java.lang.IllegalArgumentException,java,swing,jlabel,illegalargumentexception,Java,Swing,Jlabel,Illegalargumentexception,我在JavaSwing中尝试我的第一个代码,但遇到了很多错误。我的代码是: import java.awt.*; import java.awt.event.*; import javax.swing.*; class Swinging extends JFrame { JTextField ans; int count =0; static final long serialVersionUID = 1L; Swinging() {
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Swinging extends JFrame
{
JTextField ans;
int count =0;
static final long serialVersionUID = 1L;
Swinging()
{
Container cp= getContentPane();
cp.setLayout(new FlowLayout());
cp.add(new JLabel("value",7));
ans=new JTextField("0",10);
cp.add(ans);
JButton inc= new JButton("increment");
cp.add(inc);
inc.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
++count;
ans.setText(count+"");
}
});
setSize(200,200);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
public class Usingswing {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new Swinging(); // Let the constructor do the job
}
});
}
}
误差如下:
Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: horizontalAlignment
at javax.swing.JLabel.checkHorizontalKey(Unknown Source)
at javax.swing.JLabel.setHorizontalAlignment(Unknown Source)
at javax.swing.JLabel.<init>(Unknown Source)
at javax.swing.JLabel.<init>(Unknown Source)
at hopeso.Swinging.<init>(Usingswing.java:16)
at hopeso.Usingswing$1.run(Usingswing.java:45)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$400(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
线程“AWT-EventQueue-0”java.lang.IllegalArgumentException中的异常:horizontalAlignment
位于javax.swing.JLabel.checkHorizontalKey(未知源)
位于javax.swing.JLabel.setHorizontalAlignment(未知源)
javax.swing.JLabel。(未知源)
javax.swing.JLabel。(未知源)
在hopeso.swing(使用swing.java:16)
在hopeso.Usingswing$1.run(Usingswing.java:45)
在java.awt.event.InvocationEvent.dispatch(未知源)处
位于java.awt.EventQueue.dispatchEventImpl(未知源)
位于java.awt.EventQueue.access$400(未知源)
在java.awt.EventQueue$3.run处(未知源)
在java.awt.EventQueue$3.run处(未知源)
位于java.security.AccessController.doPrivileged(本机方法)
位于java.security.ProtectionDomain$1.doIntersectionPrivilege(未知源)
位于java.awt.EventQueue.dispatchEvent(未知源)
位于java.awt.EventDispatchThread.pumpOneEventForFilters(未知源)
位于java.awt.EventDispatchThread.pumpEventsForFilter(未知源)
位于java.awt.EventDispatchThread.pumpEventsForHierarchy(未知源)
位于java.awt.EventDispatchThread.pumpEvents(未知源)
位于java.awt.EventDispatchThread.pumpEvents(未知源)
位于java.awt.EventDispatchThread.run(未知源)
我试着用别人发的问题来解决我的问题,但没有奏效。请帮忙 发生错误的原因如下:
cp.add(new JLabel("value",7));
您正在使用JLabel
的构造函数来接收文本和水平对齐。对齐是一个int
,但它必须是以下常量之一,否则它将抛出IllegalArgumentException
:
- 左(2)
- 中心(0)
- 右(4)
- 领先(10)
- 拖尾(11)
SwingConstants
中定义,因此您可以编写如下内容:
cp.add(new JLabel("value", SwingConstants.CENTER));