获取包含长值的哈希表上的方法

Question

I have a hashtable that I have declared as: Hashtable<Long, Long> sumhash = new Hashtable<Long, Long>(); Now, when I check if there exists a key using:

if(sumhash.containsKey(diff) == true){
    start = sumhash.get(diff);
} //diff contains a Long value.

It works when I am checking if diff exists in the hashtable or not but when I am trying to get vaule using the get() method, It gives me error: incompatible types: Long cannot be converted to int

I am new to Java, Thanks in advance.

Answer 1

You should cast it with.intValue(). The issue here is that in the hash table you are storing the values as Long objects and thus you need a bit more than just parenthesis to cast. Here is a more comprehensive explanation: https://www.javatpoint.com/java-long-to-int