Java IO with a Jar file using command line

Question

I want to be able to open a jar file and have it open a console that I can interact with it from. I have tried opening the jar with java.exe instead of javaw.exe , but the window that appears closes almost instantly when I try to run the program. What am I doing wrong?

Answer 1

1. you run java.exe not from the console.
2. the program jar cannot be run, has errors, or exited immediately.
3. to run java.exe on Windows OS requires to create a surrogate console to run a console program.
4. javaw.exe doesn't open a console, so you can't see the output.

Answer 2

Your program is closed because it is not waiting for input data.

See example:

public static void main(String[] args) throws Exception {  
    System.out.println("Hello! I'm waiting for input...");
    args = new Scanner(System.in).nextLine().split(" ");            
    System.out.println("I received your data: \r\n\r");
    for(int i=0; i<args.length; i++) System.out.print(args[i] + " ");
    System.out.println("\r\n\rAfter 10 second I'll close");
    Thread.sleep(10 * 1000);
    // Here program did not waiting for input and was closed automatically;
}   

What shown in console:

C:\Users\user>java -jar "C:\myprogram.jar"
Hello! I'm waiting for input...
bla blabla bla bla // I did enter it to console
I received your data:

bla blabla bla bla
After 10 second I'll close

After 10 seconds program was closed, because not waiting for input data.