May 13, 2009 · List<String> list = new ArrayList<>(); This is how to create a LinkedList in java, If you need to do frequent insertion/deletion of elements on the list, you should use LinkedList instead of …

Aug 5, 2014 · For the Consumer, this code passes in a method reference (Java 8 feature) to the pre-Java 8 method List.addAll to add the inner list elements sequentially. Appends all of the elements in …

How do I convert an array to a list in Java? I used the Arrays.asList() but the behavior (and signature) somehow changed from Java SE 1.4.2 (docs now in archive) to 8 and most snippets I found on t...

Nov 15, 2012 · List is an Interface, you cannot instantiate an Interface, because interface is a convention, what methods should have your classes. In order to instantiate, you need some …

Aug 2, 2013 · Is there a way to create a list of primitive int or any primitives in java No you can't. You can only create List of reference types, like Integer, String, or your custom type. It seems I can do List …

Jun 17, 2009 · List<String> places2 = Collections.singletonList("Buenos Aires"); This would mean that places2 is immutable (trying to change it in any way will cause an UnsupportedOperationException …

To get a mutable list you can wrap the returned list in a new ArrayList as a couple of answers point out, but a cleaner solution is to use Guava's Lists.newArrayList () (available since at least Guava 10, …

Remember that, converting from List to Set will remove duplicates from collection because List supports duplicates but Set does not support duplicates in Java. Direct Conversion : The most common and …

Now java 9 has factory Methods for Immutable List, Set, Map and Map.Entry . In Java SE 8 and earlier versions, We can use Collections class utility methods like unmodifiableXXX to create Immutable …

Apr 20, 2012 · The following one-liner Java 8 version will generate [ 1, 2 ,3 ... 10 ]. The first arg of iterate is the first nr in the sequence, and the first arg of limit is the last number.