Learning Java TwoRandomTester

Any suggestions that would get this run , I would greatlya appreciated it.

To the expression generator.nextInt(n) will evaluate to a random integer between 0 and 1 less than n inclusive.

Determine which of the two randomly generated integers is the arger of the two and display it to the screen in a message:

"The larger of the number ____ and _____ is ____.

Output
Please enter a number of your choice.
100
The first random number picked was 13.
The second random number picked was 67
The larger of the numbers 13 and 67 was 67
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package tworandomtester;
import java.util.Random;
import javax.swing.JOptionPane;

public class TwoRandomTester {

    public static void main(String[] args)
    {
       String input;
       
       Random generator = new Random();
       
       int randNum;
     
       input = JOptionPane.showInputDialog("Please enter a number of your choice");
        randNum = generator.nextInt(-1);
       
        JOptionPane.showMessageDialog(null, "The larger of the two numbers si that number");
    }

}