判断字符串是否为数字的工具类

src/main/java/com/mtz/qqbot/Tool/isNumber.java

@@ -0,0 +1,15 @@
+package com.mtz.qqbot.Tool;
+
+public class isNumber {
+    public static boolean isNum(String str) {
+        if (str == null || str.isEmpty()) {
+            return false;
+        }
+        try {
+            Integer.parseInt(str);
+            return true;
+        } catch (NumberFormatException e) {
+            return false;
+        }
+    }
+}