System.exit() in Java

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

Following is the declaration for java.lang.System.exit() method:

public static void exit(int status)

exit(0) : Generally used to indicate successful termination.
exit(1) or exit(-1) or any other non-zero value – Generally indicates unsuccessful termination.

Note : This method does not return any value.

The following example shows the usage of java.lang.System.exit() method.

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// A Java program to demonstrate working of exit()
import java.util.*;
import java.lang.*;
  
class GfG
{
    public static void main(String[] args)
    {
        int arr[] = {1, 2, 3, 4, 5, 6, 7, 8};
  
        for (int i = 0; i < arr.length; i++)
        {
            if (arr[i] >= 5)
            {
                System.out.println("exit...");
  
                // Terminate JVM
                System.exit(0);
            }
            else
                System.out.println("arr["+i+"] = " +
                                  arr[i]);
        }
        System.out.println("End of Program");
    }
}

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Output:


arr[0] = 1
arr[1] = 2
arr[2] = 3
arr[3] = 4
exit...



Reference : 

https://docs.oracle.com/javase/7/docs/api/java/lang/Runtime.html


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