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Try to enter numeric inputs

I am having trouble trying to figure out how to prevent user input. I understand how to prevent non-numeric inputs (i.e. entering a letter instead of a number), but not vice versa. How do I get around this?

String[] player_Name = new String[game];      
  for (i = 0; i < game; i++) {
     try {
        player_Name[i] = JOptionPane.showInputDialog("Enter the name of the 
player, one by one. ");
     } catch(Exception e) {
        JOptionPane.showMessageDialog(null, "Enter a valid name!");
        i--;
     }
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2 answers


Use the do / while statement. "Enter the input until the input finally contains one number."



String[] player_Name = new String[game];      
for (int i = 0; i < game; i++) {
     String input;
     do {               
        input = JOptionPane.showInputDialog("Enter the name of the 
        player, one by one. ");            
      } while (input.matches(".*\\d+.*"));

      player_Name[i] = input;
 }
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You can use regex to accept only characters, below is the code snippet,

  String regex = "^[A-z]+$";
  String data = "abcd99";
  System.out.println(data.matches(regex));


So, in your code, you can put validation like this:

String[] player_Name = new String[game];
for (int i = 0; i < game; i++) {
    player_Name[i] = JOptionPane.showInputDialog("Enter the name of the  player, one by one.     ");
    if (!player_Name[i].matches("^[A-z]+$")) {
        JOptionPane.showMessageDialog(null, "Enter a valid name!");            
    }
    i--;
}
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