package mycode;//没有这句时程序能顺利运行,加上了就出现异常。
/*
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)*/大哥大姐给解释一下好吗?
/*
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)*/大哥大姐给解释一下好吗?
at sun.awt.windows.WToolkit.initIDs(Native Method)
at sun.awt.windows.WToolkit.<clinit>(Unknown Source)
at sun.awt.Win32GraphicsEnvironment.<clinit>(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(Unknown Source)
at java.awt.Window.init(Unknown Source)
at java.awt.Window.<init>(Unknown Source)
at java.awt.Frame.<init>(Unknown Source)
at javax.swing.JFrame.<init>(Unknown Source)
at SimpleSwingDemo.<init>(SimpleSwingDemo.java:20)
at SimpleSwingDemo.main(SimpleSwingDemo.java:57)我在MyEclipse6.0写了如下的代码:
//省略import 语句
public class SimpleSwingDemo extends JFrame implements ActionListener { private JLabel jLabel;
private JButton jButton;
private String labelPrefix ="Number of button clicks";
private int numClicks = 0;
public SimpleSwingDemo(String title){
super(title);
jLabel = new JLabel(labelPrefix + "0");
jButton = new JButton("I am a swing button");
jButton.setMnemonic('i');
jButton.setToolTipText("Press me");
jButton.addActionListener(this);
Container contentPane = getContentPane();
contentPane.setLayout(new GridLayout(2,1));
contentPane.add(jLabel);
contentPane.add(jButton);
pack();
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
numClicks++;
jLabel.setText(labelPrefix + numClicks); } /**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub new SimpleSwingDemo("hello");
}}Run as java Application时,出现上面的错误! 不知道是怎么回事情!请教高手