經過異常捕獲判斷字符串是否是數字格式

public class IfNum {
    public static void main(String[] args) {
       String str1 = "123";
       String str2 = "1a3";
       System.out.println("123是數字嗎？："+isInteger(str1));
       System.out.println("1a3是數字嗎？："+isInteger(str2));
    }

    //經過捕獲異常來判斷字符串是否爲數字格式
    public static boolean isInteger(String value) {
         try {
          Integer.parseInt(value);
          return true;
         } catch (NumberFormatException e) {
          return false;
         }
    }
}