Using a char array as Hashtable key
hashtable, java
Solution
You can't use arrays like this as map keys, because arrays have the default, referential-equality-based `Object` implementations of `equals` and `hashCode`. Using `String` as the key instead would make your program work as desired.
Problem
I am working with `Hashtable` in my java program. I just surprised by seeing the abnormal behavior of `Hastable`. Below is my code (This is not my final code, i simply created a new simple project with the code which is running abnormal) ``` Hashtable<char[], char[]> h1 = new Hashtable<char[], char[]>(); char[] key = Integer.toString(12).toCharArray(); char[] val = Integer.toString(21).toCharArray(); h1.put(key, val); System.out.println(h1.containsKey(Integer.toString(12).toCharArray()));// Should print true, since 12 is there in Hashtable ```