#Java - Code Snippets for '#Collections framework'

#Java - Code Snippets for '#Collections framework' - 3 code snippet(s) found

Sample 1. Usage of LinkedHashMap



Map<String,String> linkedhashmap = new LinkedHashMap();

linkedhashmap.put("United States", "Washington");

linkedhashmap.put("Canada", "Ottawa");

linkedhashmap.put("Canada", "Ottawa");

linkedhashmap.put("South Africa", "Pretoria");

linkedhashmap.put("South Africa", "Cape Town");

linkedhashmap.put("South Africa", "Bloemfontein");



System.out.println(linkedhashmap); // Duplicates not allowed as it's a Map, Insertion Order as its linked Map

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Sample 2. Print all elements of a ListValuedMap ( Apache Commons ) using forEach and System.out::println

ListValuedMap<String,String> listValuedMap = new ArrayListValuedHashMap();

listValuedMap.put("United States", "Washington");

listValuedMap.put("Canada", "Ottawa");

listValuedMap.put("Canada", "Ottawa");

listValuedMap.put("South Africa", "Pretoria");

listValuedMap.put("South Africa", "Cape Town");

listValuedMap.put("South Africa", "Bloemfontein");



listValuedMap.entries().forEach(System.out::println);

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Sample 3. Usage of EnumMap

Map<Country,String> map = new HashMap();

map.put(Country.US, "Washington");

map.put(Country.CANADA, "Ottawa");

map.put(Country.CANADA, "Ottawa");

map.put(Country.SOUTH_AFRICA, "Pretoria");

map.put(Country.SOUTH_AFRICA, "Cape Town");

map.put(Country.SOUTH_AFRICA, "Bloemfontein");



Map<String,String> enumMap = new EnumMap(map); // Prints {CANADA=Ottawa, US=Washington, SOUTH_AFRICA=Bloemfontein}



System.out.println(enumMap); // Duplicates not allowed as it's a Map, Sorted as per order of Enum Declarations

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