Java - Incrementing Numbers using for loop

I have attempted to complete the following exercise however the output isn't as expected.

You should print a number of pluses equal to the number entered by the user, followed by a list of numbers, so that in total exactly 20 characters are printed. The numbers printed should be the last digit of the current position in the list. Example: +++++678901234567890 if the number entered by the user was 5.

Here's my code:

package interact;

import java.util.Scanner;

public class Interact {

public static void main(String[] args) {



    Scanner scanner = new Scanner (System.in);

        {int value,k
        for (int i=0; i<num1; i++) {
            System.out.print("+");}


                    for (int j=0; j<20-num1; j++) {

                        if (num1>9) {k=num1-10;}

                        else k=num1+1;
                        System.out.print(k);

            }

}

The output if 6 is entered is ++++++77777777777777. The numbers aren't incrementing - why not?