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e3ad8f5c · CyC2018 · 287f3656 · e3ad8f5c
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notes/剑指 offer 题解.md notes/剑指 offer 题解.md +2 -0

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--- a/notes/剑指 offer 题解.md
+++ b/notes/剑指 offer 题解.md
@@ -1017,6 +1017,8 @@ public boolean match(char[] str, char[] pattern) {

 ```java
 public boolean isNumeric(char[] str) {
+    if (str == null)
+        return false;
    return new String(str).matches("[+-]?\\d*(\\.\\d+)?([eE][+-]?\\d+)?");
 }
 ```