Java Language Tutorial => Types and Usage of Sets

Example

Generally, sets are a type of collection which stores unique values. Uniqueness is determined by the equals() and hashCode() methods.

Sorting is determined by the type of set.

`HashSet` - Random Sorting

Java SE 7

Set<String> set = new HashSet<> ();
set.add("Banana");
set.add("Banana");
set.add("Apple");
set.add("Strawberry");

// Set Elements: ["Strawberry", "Banana", "Apple"]

`LinkedHashSet` - Insertion Order

Java SE 7

Set<String> set = new LinkedHashSet<> ();
set.add("Banana");
set.add("Banana");
set.add("Apple");
set.add("Strawberry");

// Set Elements: ["Banana", "Apple", "Strawberry"]

`TreeSet` - By `compareTo()` or `Comparator`

Java SE 7

Set<String> set = new TreeSet<> ();
set.add("Banana");
set.add("Banana");
set.add("Apple");
set.add("Strawberry");

// Set Elements: ["Apple", "Banana", "Strawberry"]

Java SE 7

Set<String> set = new TreeSet<> ((string1, string2) -> string2.compareTo(string1));
set.add("Banana");
set.add("Banana");
set.add("Apple");
set.add("Strawberry");

// Set Elements: ["Strawberry", "Banana", "Apple"]

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Java Language

Fastest Entity Framework Extensions

Example

`HashSet` - Random Sorting

`LinkedHashSet` - Insertion Order

`TreeSet` - By `compareTo()` or `Comparator`

Got any Java Language Question?

Java Language

Java Language Sets Types and Usage of Sets

Fastest Entity Framework Extensions

Example

HashSet - Random Sorting

LinkedHashSet - Insertion Order

TreeSet - By compareTo() or Comparator

Got any Java Language Question?

`HashSet` - Random Sorting

`LinkedHashSet` - Insertion Order

`TreeSet` - By `compareTo()` or `Comparator`