Java enables the operating system's restricted environment, a type of security measure designed to protect the system from malicious software and unauthorized access to the system. The operating system typically implements a restricted environment and restricts the type of programs and data that can be accessed and executed. This helps to protect the system from malware, viruses, and other malicious software. Java enables the operating system to control the environment by limiting the resources that can be accessed and used and the types of programs that can be run. This helps to ensure that only trusted programs and data can be accessed and executed and that malicious software and unauthorized access are blocked.