The java.lang.System.exit() method exits current program by terminating running Java virtual machine(JVM). This method takes a standing code. A non-zero value of status code is usually wont to indicate abnormal termination. this is often similar exit in C/C++.

In Java, System.exit() is a method used to terminate the execution of a Java program. When System.exit() is called, it immediately stops the execution of the current program and shuts down the Java Virtual Machine (JVM).

The System.exit() method accepts an integer argument that represents the exit status of the program. An exit status of 0 indicates that the program terminated successfully, while a non-zero exit status indicates that an error occurred during the execution of the program.

System.exit() is commonly used to terminate a program when a critical error occurs or when the program needs to be forcefully terminated. For example, if a program encounters an unexpected exception, it may call System.exit() to immediately terminate the program and alert the user or developer of the issue.

It is important to note that using System.exit() in a program can have implications, especially in a larger system. For example, if a program is running as part of a larger system, calling System.exit() will terminate the entire system, which may cause unexpected results or consequences. Additionally, any code after a call to System.exit() will not be executed.

Overall, System.exit() is a powerful tool in Java that should be used with caution and only when necessary.