Questions tagged [containskey]
80 questions
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votes
2 answers
Calculating nanotime for Java's containsKey operation
I am trying to crate a code, which calculates Java Map's containsKey -operation in nanoseconds (like how fast it runs that operation). Method has a Map D as a parameter, and the value returned should be containsKey operations' normal…
QuestionsAndAnswers
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7 answers
HashMap containsKey returns false for Integer
I have this simple code and i figured out that for the last array number the containsKey method returns always false.
int[] indices = new int[] { 1, 3, 5, 7, 9 };
Map seen = new HashMap<>();
for (int i = 0; i < indices.length -…
ddarellis
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3 answers
HashMap.containsKey not working for some reason
I wonder why the logic if (!map.containsKey("Africa")) neither go to if block (XX) nor else block (YY)
public class HashMapWithListTest {
public static void main (String args[]) {
HashMap> map=new…
lagunaloire
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votes
2 answers
Hashmap contains key return false even when key exists
I have made a hashmap Map percentages= new HashMap();, I have entered values and keys into it and that was successful, but when I try to get the or try ContainsKey method then it returns false.
Please see the attached screen shot:
Mr_Hmp
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1 answer
Java cannot find Symbol - containsKey(Item)?
In my Supermarket Checkout Program when I run it, it comes up with this error in the Checkout class in the addItem method:
cannot find symbol - method containsKey(Item)
I cannot understand why it is coming up with this error as I have checked the…
footballgeek
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