Previously we showed you how to turn on SecurityManager in Java. After SecurityManager is turned on, a series of permission checks will be applied on the code you are calling in your application to protect some resources against malicious access such as files, sockets etc.To perform these permission checks, a set of Permissions will be created and checked using the AccessController. The AccessController has three purposes :To decide whether an access to a critical system resource is to be allowed or denied, based on the security policy currently in effect,To mark code as being "privileged", th...