HashSet
In this chapter you will learn:
HashSet class
The HashSet extends AbstractSet
and implements the Set interface.
It creates a collection that uses a hash table for storage.
HashSet is a generic class that has this declaration:
class HashSet<E>
E specifies the type of objects that the set will hold.
A demonstration of a hashset with String elements unordered
import java.util.HashSet;
import java.util.Set;
/*from jav a 2 s . com*/
public class Main {
public static void main(String[] args) {
Set<String> ss = new HashSet<String>();
String[] fruits = { "apples", "pears", "grapes", "bananas", "kiwis", "pears", null };
for (String fruit : fruits){
ss.add(fruit);
}
for (String s : ss){
System.out.print(s + " ");
}
}
}
The code above generates the following result.
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What you will learn in the next chapter:
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