Tag: arraylist

Clone an ArrayList to another ArrayList does not work in DP

Here is the Java code to find the shortest concatenation of elements of Array wordBank to construct String Terget, using Dynamic Programming. Example: Input: wordBank = {“ab”, “c”, “d”, “abc”, “ad”}, Target = “abcd”. Output: {“abc&#…

Check if multiple objects have same value of a field in java and remove duplicates based on other fields

arraylist arrays java object spring-boot

So I have a list of objects. Suppose they have 2 fields startDate, endDate(data type is timestamp). So if startDate is equal to startDate of another object then I have to choose the object with higher endDate. How can I achieve this efficiently. I can use 2 for loops but that would have a high time complexity…

Need a equivalent code in java streams for iterating list of Object

arraylist java java-stream

Can anyone help me with the stream equivalent code Note:- I cannot make the studentFinalList “final” Answer Some conditions in the code seem to be redundant and may be removed without affecting the logic: StringUtils.isBlank(ep.getName()) && ep.getName() == null may be shortened to ep.getN…

Sorting LinkedHashMap<String, ArrayList> by counting the occurrences in ArrayList problem

arraylist java linkedhashmap sorting

I have: How can i sort “maps” by counting the occurrences in “miss”? For example: miss => [3, 7] maps => {1=[0, 3, 6], 4=[2, 3, 4], 6=[0, 3, 7], 11=[1, 3, 6], 17=[2, 6, 11]} And i want to get: maps => {6=[0, 3, 7], 1=[0, 3, 6], 4=[2, 3, 4], 11=[1, 3, 6], 17=[2, 6, 11]} Answer …

Create a list of List from an Array

arraylist data-structures java

How can i create a list of List from Array eg: int[] arr = {3, 1, 5, 8, 2, 4}. Such that the lists in the List have only two elements eg: [[3,1], [5,8], [2,4]]. So far i have tried code below but it return only lists with one element,I can’t figure out where i went wrong. Result: [[3], [1],

java arraylist.add overwriting

arraylist java

I tried to add 1D ArrayList into 2D ArrayList like the following code, but the output was [34, 35, 36] [[34, 35, 36]] [4, 5, 6] [[4, 5, 6], [4, 5, 6]] <- the correct output would be [[34, 35, 36], [4, 5, 6]]. the previous one was overwritted, how can I solve this problem? Answer You put the array

Print a string from ArrayList of String[] per Index?

arraylist java

How to print ArrayList of String[] into String per index with expected Output like this Here is the code and how to print it? Answer You were pretty close to it: This generates your String to be outputted. Printing: Just don’t forget to initialize yourArrayList prior of the method call.