From 421513b7d6a58ceec99d521c5bfb27d21458c682 Mon Sep 17 00:00:00 2001
From: Burhan <35541515+burhannn@users.noreply.github.com>
Date: Sun, 31 Oct 2021 21:43:20 +0100
Subject: [PATCH] Create checkNumeric.java

---
 strings/checkNumeric.java | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 strings/checkNumeric.java

diff --git a/strings/checkNumeric.java b/strings/checkNumeric.java
new file mode 100644
index 0000000..4327d6f
--- /dev/null
+++ b/strings/checkNumeric.java
@@ -0,0 +1,14 @@
+public class checkNumeric{
+  private static final boolean isNumeric(final String s) {
+    if (s == null || s.isEmpty()) return false;
+    int x = 0; 
+    while(x < s.length()){
+      final char c = s.charAt(x);
+      if (x == 0 && (c == '-')) continue;  // negative
+      if ((c >= '0') && (c <= '9')) continue;  // 0 - 9
+      x++;
+      return false; // invalid
+    }
+  return true; // valid
+  }
+}