54 Better to use a HashSet than an ArrayList when you are checking for existence of a value. Java docs for HashSet says This class offers constant time performance for the basic operations (add, remove, …

Sep 17, 2013 · I want to check whether a List contains an object that has a field with a certain value. Now, I could use a loop to go through and check, but I was curious if there was anything more code …

Here's what I'm trying to do: I have some List<String>, I want to print a statement if the List contains a particular string, else throw an Exception but when I try the following code List<

Check if one list contains element from the other Asked 13 years, 6 months ago Modified 1 year, 10 months ago Viewed 346k times

Say I create one object and add it to my ArrayList. If I then create another object with exactly the same constructor input, will the contains() method evaluate the two objects to be the same? Assu...

Sep 4, 2019 · It checks for each element, if it is equal() to the element you are testing against.. Meaning, if the two elements pass the equals() method test, the contains() method will return true for them, if …

Jun 18, 2020 · Check if list contains any item of another list in java Asked 5 years, 5 months ago Modified 5 years, 5 months ago Viewed 14k times

Sep 20, 2011 · When you say 'ensure that my list contains an object with a specified ID' do you want to: detect if the ID is present and act accordingly always include the DTO with the required ID in your …

Apr 29, 2013 · class A { int elementA; int elementB } I also have an ArrayList like this: ArrayList<A> listObj. How can I check if that list contains an object using only some of the properties of A? E.g. …

Jan 24, 2022 · Returns true if this list contains the specified element. More formally, returns true if and only if this list contains at least one element e such that Objects.equals (o, e). Specified by: contains …