Why .jar files or .exe files made from those .jar files don't open (or close immediately)?

See more:

Java

Have made a simple calculator using Java in both .jar and .exe formats using following method:

1) .java test with following code:

import java.util.*;
  class Calccc
  {
      public static void main(String[] args)
      {
          Scanner sc= new Scanner(System.in);    //System.in is a standard input stream
          System.out.print("Start number");
          int a= sc.nextInt();
          System.out.print("Enter second number- ");
          int b= sc.nextInt();
          System.out.print("Enter third number- ");
          int c= sc.nextInt();
          int d=a+b+c;
          System.out.println("Total= " +d);
      }
  }

2) command prompt javac Calccc.java.

3) command prompt jar cvf Calccc.jar Calccc.class.

4) creating manifest.txt in the same folder by Main-Class: Calccc written in the .text plus an extra enter at the end.

5) command prompt jar cmf manifest.txt Calccc.jar Calccc.class.

Then using launch4j application version 3.8 to set a .exe file out of the jar file:

determinig the Output file:
determining Jar.

determining the minimum java -version
clicking on floppy disk icon and save the XML file
clicking on settings icon

But, neither the .jar file nor the .exe file work by double-clicking, but the .jar file works fine within the command line.

What I have tried:

Created multiple of times those fules, but the result didn't change. Also reinstalling Java didn't help either (Java 1.8.0 update 311)