在linux下 public boolean exists() { SecurityManager security = System.getSecurityManager();

在linux下，public boolean exists(){ security manager security = system . getsecuritymanager()；在linux下，public boolean exists(){ security manager security = system . getsecuritymanager()；简介:public boolean exists(){安全管理器security = system . getsecuritymanager()；进入这里是错误的，不是吗？