Caused by: java.lang.ClassNotFoundException: HelloWorld.class
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)
我在桌面上写了个HelloWorld.java的文件,然后用javac编译,在桌面上出现HelloWorld.class这个文件,然后再用java运行HelloWorld.class,就出现现在这个情况了