java错误笔记–不定时更新
1.包名中不能出现java关键字
- 今天试着写写了一些java图形化的代码,在eclipse中调试出现下面的问题:
然后报错:
Exception in thread "main" java.lang.SecurityException: Prohibited package name: java.awt.test
at java.lang.ClassLoader.preDefineClass(Unknown Source)
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$100(Unknown Source)
at java.net.URLClassLoader$1.run(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 sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
注意这句话:
Exception in thread “main” java.lang.SecurityException: Prohibited package name: java.awt.test
找来找去发现问题原来是包名中不能出现java关键字
把上面的的包名改掉就可以正确运行了:
代码如下:
package java1.awt.test;
import javax.swing.JFrame;
import java.awt.Color;
public class JFrameDemo01
{
public static void main(String args[])
{
JFrame f = new JFrame("第一个Swing窗体");
f.setSize(230, 80); // 设置组件的大小
f.setBackground(Color.WHITE); // 将背景设置成白色
f.setLocation(300, 200); // 设置组件的显示位置
f.setVisible(true); // 让组件可见
}
};
参考链接:
java错误提示:Exception in thread “main” java.lang.SecurityException: Prohibited package name: java.gener