java - 数字格式异常

Question

我正在尝试使用实用函数来获取 int 并检查错误的输入是否会导致
NumberFormat 异常，有没有办法在以下函数中使用非十进制整数

//--- Utility function to get int using a dialog.

public static int getInt(String mess) {
    int val;
    while (true) { // loop until we get a valid int
        String s = JOptionPane.showInputDialog(null, mess);
        try {
            val = Integer.parseInt(s);
            break;  // exit loop with valid int
        } catch (NumberFormatException nx) {
            JOptionPane.showMessageDialog(null, "Enter valid integer");
        }
    }
    return val;
}

//end getInt

Answer 1

如果我理解你...也许你可以这样做:

public static int getInt(String mess) {
    int val;
    while (true) { // loop until we get a valid int
        String s = JOptionPane.showInputDialog(null, mess);
        try {
            if(mess.match("^\d+$")){   // Check if it's only numbers (no comma, no dot, only numeric characters)
               val = Integer.parseInt(s); // Check if it's in the range for Integer numbers.
               break;  // exit loop with valid int
            } else  {
               JOptionPane.showMessageDialog(null, "Enter valid integer");
            }
        } catch (NumberFormatException nx) {
            JOptionPane.showMessageDialog(null, "Enter valid integer");
        }
    }
    return val;
}