如何在Java中的try catch语句期间结束程序？

Question

I already asked a question about how to have a message pop up and say "please enter a number input" but it was supposed to end the program. Not crash it, but end the program then you would have to rerun it.

`    try 
 {
     number = in.nextInt();

       if(number >= 8) 
       { 
       number = 8; 
       }
       else if (number <= 0)
       {
       number = 0;
       }
   } 
   catch (InputMismatchException exc) 

   {
       System.out.println("Program requires NUMBER input");

   }

`

I tried doing a "break;" in the catch (experimented I guess) and it didn't work.

---

UPDATE: Thanks everyone, I tried return in a previous project and it didn't work. But it worked here so thank you again!!

Answer 1

Use the return statement. That should end the method. System.exit(0) is an alternative option. However, you must be cautious when using System.exit(0) because:

The System.exit method forces termination of all threads in the Java virtual machine. This is drastic....System.exit should be reserved for a catastrophic error exit, or for cases when a program is intended for use as a utility in a command script that may depend on the program's exit code.

Source: Use System.exit with care

Answer 2

Use System.exit();

   try{
   ...
   } 
   catch (InputMismatchException exc) 

   {
       System.out.println("Program requires NUMBER input");
       System.exit(1);

   }

Or if your are in the main function, you can just return;

Answer 3

Use return; , read also What does the return keyword do in a void method in Java?

public static void main(String[] args) {

    return; // END OF PROGRAM :)
}

Returning a Value from a Method

return statement can be used to branch out of a control flow block and exit the method

Answer 4

You can just make use simple return; at end of the catch block rather then System.exit(), it will kill the jvm.

Answer 5

If you're certain you want the program to terminate you would just do

System.out.println("Program requires NUMBER input");
System.exit(1); // <-- non-zero to indicate an error.

Answer 6

If that's in your main method, do return; otherwise you can do eg System.exit(1);