java - 尝试捕捉数字输入

Question

我在尝试弄清楚如何防止用户输入数字时遇到了一些麻烦。我了解如何防止非数字输入(即输入字母而不是数字)，但反之则不然。我该如何解决这个问题？

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--;
     }

Answer 1

使用 do/while 语句。“当输入至少包含一个数字时进行输入”。

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;
 }