In this tutorial we will see how tojoin (or Combine) two ArrayLists in Java. We will be usingaddAll()method to add both the ArrayLists in one finalArrayList. Example: In this example we are merging two ArrayLists in one single ArrayList and then displaying the elements of final List. p...
In this tutorial, you will learn how to initialize an ArrayList in Java. There are several different ways to do this. Let’s discuss them with examples. 1. Basic (Normal) Initialization One of the ways to initialize anArrayListis to create it first and then add elements later usingadd()m...
Tip: There are more ways to merge lists using libraries like guava or Apache commons lang, but they all useaddAll()method only. So it’s better to use this method directly. 1.2. UsingStream.flatMap() Java 8 streams provide us with one-line solutions to most of the problems and at th...
This is a basic way to sort a list in Java, but there’s much more to learn about sorting lists, especially when dealing with custom objects or when you want to sort in a different order. Continue reading for a more detailed understanding and advanced usage scenarios. Table of Contents[hi...
2. Compare Two Lists – Find Additional Items In the following examples, we will find the items that are present in list1, but not in list2. 2.1. Plain Java If two arraylists are not equal and we want to findwhat additional elements are in the first list compared to the second list...
add(7); myStack.add(8); myStack.add("nine"); System.out.println("Stack: " + myStack); } } The above code outputs: ArrayList: [1, 2, three] LinkedList: [4, 5, six] Stack: [7, 8, nine] We can see that we added int and String values to the lists without any error....
If the value satisfies the condition, it is added to the res list with add method. The next code example uses the filter method. Main.java import java.util.List; void main() { var vals = List.of(-3, 0, 1, -1, 2, 5, 12, 8, -7, -2, 11); var res = vals.stream()....
toList()); System.out.println(newList2); } } In the code block above, the first two lines initialize the lists that we want to concatenate. The first way of list initialization is to give elements at the time of declaration itself. So as per the Java 8 methodology, the Stream ...
In Scala, lists are immutable data structures in which adding new elements is not allowed. So, here we will solve this problem that is generally done in functional programming paradigms. To add elements to a listthere are two methods,
We learned ways to break a Java List into multiple fixed-size sublists. In the examples, we used Guava and Apache Commons Collections libraries to partition a Java List and understood that the partitioned Lists are just the views of the original List. In the end, we saw how to use the...