Java에서 문자가 숫자인지 확인

import java.util.*;
public class Main {
  public static void main(String[] args) {
    // public static boolean isDigit(char ch)
    // Determines if the specified character is a digit.
    char c1 = '6';
    if (Character.isDigit(c1)) {
      System.out.println("Character Is Number");
    } else {
      System.out.println("Character is not a number");
    }
  }
}

Character Is Number