ArrayList<Integer> myArrayList = new ArrayList<>; for (int i = 0; i < 5; i++) { myArrayList.add(i); } myArrayList.add(2); myArrayList.add(2); myArrayList.add(3); //arryaylist contains: (0,1,2,3,4,2,2,3) I want to give input to a method, and for it to return amount of times the input is seen in the array. For example: public int someMethod(int searchVal) { //code //returns […]

ArrayList<Integer> myArrayList = new ArrayList<>; for (int i = 0; i < 5; i++) { myArrayList.add(i); } myArrayList.add(2); myArrayList.add(2); myArrayList.add(3); //arryaylist contains: (0,1,2,3,4,2,2,3) I want to give input to a method, and for it to return amount of times the input is seen in the array. For example: public int someMethod(int searchVal) { //code //returns […]

I am currently working on numerical computations in a specific research domain and have inherited a Java package implemented long time ago by my team. My task now is to optimize its performance. The package makes extensive use of ArrayList<Double>. As far as I know, Java, at least up to version 9 which I am using, does not support ArrayList of primitive types due to type erasure in Java generics.

ArrayList<Integer> myArrayList = new ArrayList<>; for (int i = 0; i < 5; i++) {myArrayList.add(i);} myArrayList.add(2); myArrayList.add(2); myArrayList.add(3); //arryalist contains: (0,1,2,3,4,2,2,3) I want to give input to a method, and for it to return amount of times the input is seen in the array. For example: public int someMethod(int searchVal) { //code //returns int } […]

LeetCode console

I have a list of Person objects. Each Person object has an int id property, along with some others. Currently my list of Person objects has multiple objects with the same id. I want to filter the list so each id only exists at most once in the list.

I need to split an object list by product count. I need to maintain equal (~) products sum for all sublist properties
List propertyList
For a Property object :

List < iteminfo > items = (List < iteminfo >) in.readObject (); the above code is a sentence written in the showitems class, where itemsInfo is a class that implements the Serializable interface and uses a static private serialVersionUID. I created a showitems instance in the Listener event of the button component in another class, […]

I am trying to filter out specific elements of my array list but I keep getting an undeclared variable error.

I am programming a mastermind game in java.I have an ArrayList called “checked” and as I check through the users guess, the words “black”, “white” and “blank” are added to the arrayList. Is there anyway for me to sort the checked array at the end in order of importance, e.g. first “black”, then “white”, and then “blank”?