StarColumn.java

import javax.swing.*;

public class StarColumn {

    public static void main(String[] args) {

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        int n = 0;

        try {
            // get number using pop-up dialog
            n = Integer.parseInt(
             JOptionPane.showInputDialog( "Enter whole number"));
        }
        catch (NumberFormatException e) {
            System.out.println( "That's not a whole number!");
        } // end try..catch

        System.out.println(); // new line
        for (int i=0; i<n; i++) {
            System.out.print("*");
        } // end for
        System.out.println(); // new line

    } // end main()

} // end class StarColumn