这样的错误是啥原因呢。。。。高手们 帮帮忙

[zhiwuyang602]

java.security.AccessControlException: access denied (java.lang.RuntimePermission preferences)

at java.security.AccessControlContext.checkPermission(Unknown Source)

at java.security.AccessController.checkPermission(Unknown Source)

at java.lang.SecurityManager.checkPermission(Unknown Source)

at java.util.prefs.Preferences.userRoot(Unknown Source)

at java.util.prefs.Preferences.userNodeForPackage(Unknown Source)

at matrix.RealAlar.getRealAlar.<init>(RealtimeAlarm.java:133)

at matrix.RealAlar.getRealAlar(RealAlar.java:76)

at matrix.mainapple.MainApple.doAlar(MainApple.java:278)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at sun.plugin.com.MethodDispatcher.invoke(Unknown Source)

at sun.plugin.com.DispatchImpl.invoke(Unknown Source)

[奇伢]

access denied 拒绝访问??
程序?

[zhiwuyang602]

ding yixia

[coutcin]

没有为你的程序指定安全管理器，应该在你的代码前加上
System.setSecurityManager(new ***SecurityManager());