CODEWITHSUNDEEP
javajvm
coreJavare
coreJavare

Reputation: 1469

System.exit(status),>> This method never returns normally. What does it means

I know in we can terminate JVM with System.exit(), but in java doc ,they written as >>

"This method never returns normally.". What does it means?

Upvotes: 0

Views: 156

Answers (5)

Peter Lawrey
Peter Lawrey

Reputation: 533520

The documented purpose of this method is to stop the application.

Notes:

  • even finally blocks are prevented from executing.
  • the shutdown hooks are still run.

I assume the question is;

When does System.exit(n) return?

When you have an application server, running multiple applications, you don't want one to bring down the whole JVM. In this situation you typically have a SecurityManager which prevents a number of operations esp System.exit(). In this situation, a SecurityException can be thrown, or the JVM shuts down the specific application being run.

Upvotes: 1

Praba
Praba

Reputation: 1381

It means the program doesn't cleanly return from where it us executing. An exception thrown is also a case where the program doesn't 'cleanly' return.. As in executing through the end. Exit call abruptly terminates the execution flow.

Upvotes: 0

Thilo
Thilo

Reputation: 262504

It means that the next line of code after System.exit won't be executed (because the JVM was shut down before getting there).

Upvotes: 0

Niraj Patel
Niraj Patel

Reputation: 2208

This means program stops its execution from that line of code and it will not execute return statement and will even not call finally block

Upvotes: 2

Harmlezz
Harmlezz

Reputation: 8068

After the call System.exit() your application will terminate immediately not executing and code following the exit() statement. Look at this example:

public static void main(String[] args) {
    System.out.println("about to exit");
    System.exit(1);
    System.out.println("returned normally");
}

OUTPUT:

about to exit

The second statement System.out.println("returned normally") got never called.

Upvotes: 0

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