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→Set Interface (unique values)
===With apt===
===With apt===
<nowiki>sudo apt-add-repository ppa:webupd8team/java
<nowiki>sudo apt-add-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer</nowiki>
Also ensure your JAVA_HOME variable has been set to:
Also ensure your JAVA_HOME variable has been set to:
</syntaxhighlight>
</syntaxhighlight>
=== Set Interface (unique values) ===
===Set Interface (unique values)===
<syntaxhighlight lang="java">
<syntaxhighlight lang="java">
Set<String> set = Set("Apple", "Banana", "Cat");
Set<String> set = Set("Apple", "Banana", "Cat");
hashset.add("Dog");
hashset.add("Dog");
</syntaxhighlight>
=== Hashing (Fast searches) ===
LinkedHashSet: keeps the order in which elements are inserted<syntaxhighlight lang="java">
Set<Integer> numbers = new LinkedHashSet<>();
numbers.add(4185);
numbers.add(545);
</syntaxhighlight><br />
</syntaxhighlight><br />
=== Tree (Reduces cost of search, insert and delete) ===
<syntaxhighlight lang="java">
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import java.util.LinkedHashSet;
import java.util.HashSet;
public class SetRunner{
public static void main(String[] args){
List<Character> characters = List.of('A', 'Z', 'A', 'B', 'Z', 'F');
// print unique characters in sorted order
Set<Character> treeSet = new TreeSet<>(characters);
System.out.println("treeSet" + treeSet);
//print unique characters in insertion order
Set<Character> linkedHashSet = new LinkedHashSet<>(characters);
System.out.println("linkedHashSet" + linkedHashSet);
// hashset, sometimes sorted some not
Set<Character> HashSet = new HashSet<>(characters);
System.out.println("linkedHashSet" + linkedHashSet);
}
}
</syntaxhighlight>
==Classes and Objects==
==Classes and Objects==