Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 1 year ago. Improve this question Here are a few lines of code which I wrote to test hashmap’s performance in a multi-threading environment. I know that hashmap may cause deadlock
Tag: hashmap
How to use a HashMap returned from a method
Here I have a program which creates a HashMap within a method This program doesn’t work due to the fact that in the main method “abilities” cannot be found. How can I make it so I can use my HashMap in the main function. Answer Try it out
Scanning input in HashMap of String and ArrayList
I need to add all these cities in a HashMap of String and ArrayList And I am unable to add these , I have the structure So now i need to add banglore and then if banglore is present i will add Hyderabad to the ArrayList and again I’ll scan for the next element again banglore is present so add
Hacker Rank Frequency Queries [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 1 year ago. Improve this question I am doing the Hacker Rank Frequency Queries question and all my test cases pass but one for Time limit exceeded. What can I do
Connect two HashMap Values
I’ve got this JSON string: String json = “{“countries”:{“2″:”China”,”3″:”Russia “,”4″:”USA”},”capitals”:{“2″:Beijing,”4″:null,”3″:Moscow}}”; I converted string to HashMap, using this: And now my output is: I would like to connect this values by numbers. I want to create two ArrayList like this: A)- [China,Russia,USA] B)- [Beijing,Moscow,null] How can i do it? Answer First, you need to cast map.get(“label”) to LinkedTreeMap<Integer, String>, then create
How to properly add a value change listener to Map.Entry?
A project im working on currently requires me to ensure that while looping through a map’s entries, if Entry.setValue is called, it would trigger a value change event. I see I can try something like adding a listener into an extension of the Map class on the .put method. My question is, would entries being changed trigger a listener in
Hashcode value for Map Entry
As per javadocs hashcode for a map.entry is defined as : Plz confirm, if a bitwise XOR operator is used for calculating the hashcode value for a map entry? Answer Yes, it indeed is a bitwise XOR operator. I tried & got the same result for both the hashcode() method & by using ^ operator.
Java Map for unique object instances?
A library I use contains a certain object type, LackingObject (some type), which lacks an attribute of type Ext (some type). If I was able to change the LackingObject class, I would simply add an attribute with type Ext, but LackingObject cannot be changed, nor extended. What I’d do now in languages like C or C++ is to create a
How To Store Values in Hashmap (comma Separated) with Same Key using Java Stream API?
I have a object named EntityObjectDTO like below: This AttributeType is an enum and can have values (RAW,REFERRED,ORIGINAL). I am trying to store all the attributes names and dataType into Hashmap of String key and value. This DataType can be duplicate as well. Input: Expected in a HashMap: {“Vehicle”,”name1,name2″} {“Person”,”name3″} This is what I tried: But by this I am
Why any initialization or even print inside the constructor with @Tolerate lombok cannot be reached?
what is the problem with the constructor with @Tolerate of lombok, and why it cannot be reached? and how can I fix it? I wanna initialize a map by setting some default keys and values inside the constructor block, but it cannot be initialize because nothing can be reached inside the constructor. Would you please help me? thank you. OUTPUT: