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October 19, 2019 20:28
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JShell transcript with static factory methods for lists and sets in Java 9
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List<String> animals = new ArrayList<>(); | |
animals.add("Dog"); | |
animals.add("Lemur"); | |
animals.add("Duck"); | |
System.out.println(animals); | |
Set<String> animals = new HashSet<>(Arrays.asList("Dog", "Lemur", "Duck")); | |
System.out.println(animals); | |
Set<String> animals = new HashSet<>(){{add("Dog"); add("Lemur"); add("Duck");}}; | |
System.out.println(animals); | |
List<String> animals = List.of("Dog", "Lemur", "Duck"); | |
System.out.println(animals); | |
animals.add("Elephant"); | |
System.out.println(animals.getClass()); | |
List<Integer> singleElementList = List.of(1); | |
singleElementList.getClass() | |
List<Integer> twoElementsList = List.of(1, 2); | |
twoElementsList.getClass() | |
List<Integer> mustBeABiggerList = List.of(1, 2, 3); | |
mustBeABiggerList.getClass() | |
Map<String, Integer> wordToNumber = Map.of("one", 1, "two", 2, "three", 3) | |
wordToNumber.getClass() | |
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