Difference in System exit 0 System exit -1 System exit 1 in Java

Question

I d like to know the difference between the following in Java  System exit 0   System exit -1   System exit 1     When do I have to use the above code appropriately

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System exit 0  by convention  a zero status code indicates successful  termination  System exit 1  -It means termination unsuccessful due to some error

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A good gotcha is any error code   255 will be converted to error code   256  One should be specifically careful about this if they are using a custom error code   255 and expecting the exact error code in the application logic  http   www tldp org LDP abs html exitcodes html

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the difference of the numbers put in system exit   is explained in other answers  but the REAL DIFFERENCE is that  System exit   is a code that gets returned to the invoking process  If the program is being invoked by the Operating system then the return code will tell the OS that if system exit   returned 0 than everything was ok but if not something went wrong  then there could be some handlers for that in the parent process

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System exit system call  terminates the currently running Java virtual machine by initiating its shutdown sequence  The argument serves as a status code     By convention  a nonzero status code indicates abnormal termination     System exit 0  or EXIT SUCCESS   --- gt  Success   System exit 1  or EXIT FAILURE   --- gt  Exception   System exit -1  or EXIT ERROR    --- gt  Error   Read More at Java  On Unix and Linux systems  0 for successful executions and 1 or higher for failed executions

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The parameter of exit should qualify if the execution of the program went good or bad  It s a sort of heredity from older programming languages where it s useful to know if something went wrong and what went wrong   Exit code is   0 when execution went fine  1  -1  whatever    0 when some error occurred  you can use different values for different kind of errors    If I m correct exit codes used to be just positive numbers  I mean in UNIX  and according to range    1-127 are user defined codes  so generated by calling exit n   128-255 are codes generated by termination due to different unix signals like SIGSEGV or SIGTERM   But I don t think you should care while coding on Java  it s just a bit of information  It s useful if you plan to make your programs interact with standard tools

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exit 0  generally used to indicate successful termination  exit 1  or exit -1  or any other non-zero value indicates unsuccessful termination in general

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A non-zero exit status code  usually indicates abnormal termination  if n    0  its up to the programmer to apply a meaning to the various n s    From https   docs oracle com javase 7 docs api java lang System html

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Zero    Everything Okay  Positive    Something I expected could potentially go wrong went wrong  bad command-line  can t find file  could not connect to server   Negative    Something I didn t expect at all went wrong  system error - unanticipated exception - externally forced termination e g  kill -9    values greater than 128 are actually negative  if you regard them as 8-bit signed binary  or twos complement   There s a load of good standard exit-codes here

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Here is the answer    System exit 0     normal termination - Successful - zero System exit -1    Exit with some Error System exit 1    one or any positive integer    exit with some Information message

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class calc  public static void main String args          int a  b  c      char ch      do           Scanner s new Scanner System in                    System out print  1  Addition n                    System out print  2  Substraction n                    System out print  3  Multiplication n                    System out print  4  Division n                    System out print  5  Exit n n                     System out print  Enter your choice                       ch s next   charAt 0                       switch  ch                                                case  1                            Addition chose1 new Addition                            chose1 add                            break                           case  2                            Substraction chose2 new Substraction                            chose2 sub                            break                           case  3                            Multiplication chose3  new Multiplication                            chose3 multi                            break                           case  4                            Division chose4 new Division                            chose4 divi                            break                           case  5                            System exit 0                           break                           default                           System out print  wrong choice                               break                                System out print   n-------------------------- n                              while ch   5           In the above code when its System exit 0   and when i press case 5 it exits properly but when i use System exit 1   and press case 5 it exits with error and again when i try with case 15 it exits properly by this i got to know that  when ever we put any int inside argument it specifies that  it take the character from that position i e if i put  4  that it means take 5th character from that string if its  3  then it means take 4th character from that inputed string

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As others answer 0 meaning success  otherwise     If you using bat file  window  System exit x  will effect   Code java  myapp    if  error  lt  2       help        System exit -1         else      doSomthing        System exit 0          bat file   java -jar myapp jar if  errorlevel  neq 0 exit  b  errorlevel  rem -- next command if myapp is success --

[java] Difference in System. exit(0) , System.exit(-1), System.exit(1 ) in Java

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