Java9: Collections Factory Methods

Java 9 comes with new factory methods to create collections easily.

Photo by Aviv Rachmadian on Unsplash

Set<String> set = Set.of("A","B","C");
System.out.println(set);

List<String> list=List.of("A","B","C");
System.out.println(list);

Map<String,String> map=Map.of("A","Apple","B","Boy","C","Cat");
System.out.println(map);

This of method allows initializing the collection in one go. Without this you will have to go through adding item one by one.

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