Things you can do with Sets : Abstract Set « Collections « Java Tutorial

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Java Tutorial » Collections » Abstract Set

9. 21. 1. Things you can do with Sets


import java.util.Arrays;

import java.util.HashSet;

import java.util.LinkedHashSet;

import java.util.Set;

import java.util.TreeSet;



public class MainClass {

  static void fill(Set s) {

    s.addAll(Arrays.asList("one two three four five six seven".split(" ")));

  }



  public static void test(Set s) {

    System.out.println(s.getClass().getName().replaceAll("\\w+\\.", ""));

    fill(s);

    fill(s);

    fill(s);

    System.out.println(s); // No duplicates!



    s.addAll(s);

    s.add("one");

    s.add("one");

    s.add("one");

    System.out.println(s);



    System.out.println("s.contains(\"one\"): " + s.contains("one"));

  }



  public static void main(String[] args) {

    test(new HashSet());

    test(new TreeSet());

    test(new LinkedHashSet());

  }

}

HashSet
[one, two, five, four, three, seven, six]
[one, two, five, four, three, seven, six]
s.contains("one"): true
TreeSet
[five, four, one, seven, six, three, two]
[five, four, one, seven, six, three, two]
s.contains("one"): true
LinkedHashSet
[one, two, three, four, five, six, seven]
[one, two, three, four, five, six, seven]
s.contains("one"): true

9. 21. Abstract Set
	9. 21. 1.	Things you can do with Sets
	9. 21. 2.	AbstractSet Class
	9. 21. 3.	One Item Set

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