java错误笔记

曾经终败给现在 2022-05-23 08:22 121阅读 0赞

# java错误笔记–不定时更新 #

### 1.包名中不能出现java关键字 ###

1.  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：  
    ![这里写图片描述][70]  
    ![这里写图片描述][70 1]  
    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**  
![这里写图片描述][70 2]  
把上面的的包名改掉就可以正确运行了：  
![这里写图片描述][70 3]  
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][java_Exception in thread _main_ java.lang.SecurityException_ Prohibited package name_ java.gener]

[70]: /images/20220523/cc0f69061d1f4418a570a971f1e695d3.png
[70 1]: /images/20220523/1eb649cf4ac942bfbc689a2c71e93e44.png
[70 2]: /images/20220523/04ddae69f31c4a14a2b071b1db1c8dc0.png
[70 3]: /images/20220523/5274b1d02cc64d0db0d603de871a7b35.png
[java_Exception in thread _main_ java.lang.SecurityException_ Prohibited package name_ java.gener]: https://blog.csdn.net/lpp1234567/article/details/20856177