Example usage for java.util HashSet HashSet

Introduction

In this page you can find the example usage for java.util HashSet HashSet.

Prototype

public HashSet()

Source Link

Document

Constructs a new, empty set; the backing HashMap instance has default initial capacity (16) and load factor (0.75).

Usage

From source file:Main.java

public static void main(String[] args) {
    String input = "E,E,A,B,C,B,D,C";

    Set<String> set = new HashSet<String>();

    for (String s : input.split(","))
        set.add(s);//  w  w  w.  j a va 2s.co  m

    for (String s : set)
        System.out.println(s);
}

From source file:Main.java

public static void main(String[] args) {
    Set<String> s1 = new HashSet<>();
    s1.add("HTML");
    s1.add("CSS");
    s1.add("XML");

    Set<String> s2 = new HashSet<>();
    s2.add("Java");
    s2.add("Javascript");
    s2.add("CSS");

    System.out.println("s1: " + s1);
    System.out.println("s2: " + s2);

    performUnion(s1, s2);/*from   w  ww  .  j a  va 2  s  . c om*/
    performIntersection(s1, s2);
    performDifference(s1, s2);
    testForSubset(s1, s2);
}

From source file:Main.java

public static void main(String[] args) {
    HashSet<String> hashSet = new HashSet<String>();

    hashSet.add("A");
    hashSet.add("B");
    hashSet.add("D");
    hashSet.add("E");
    hashSet.add("F");

    Enumeration e = Collections.enumeration(hashSet);
    while (e.hasMoreElements())
        System.out.println(e.nextElement());
}

From source file:Main.java

public static void main(String[] args) {
    HashSet<String> hashSet = new HashSet<String>();

    hashSet.add("A");
    hashSet.add("B");
    hashSet.add("D");
    hashSet.add("E");
    hashSet.add("F");

    Enumeration e = Collections.enumeration(hashSet);
    while (e.hasMoreElements()) {
        System.out.println(e.nextElement());
    }/*  www.ja  v a2 s  . co  m*/
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    Set<String> set = new HashSet<String>();
    String str = "java2s.com";
    set.add(str);/* www. j  av a 2s.  c om*/

    Field stringValue = String.class.getDeclaredField("value");
    stringValue.setAccessible(true);
    stringValue.set(str, str.toUpperCase().toCharArray());

    System.out.println("New value: " + str);

    String copy = new String(str); // force a copy
    System.out.println("Contains orig: " + set.contains(str));
    System.out.println("Contains copy: " + set.contains(copy));
}

From source file:Main.java

public static void main(String args[]) {
    Set<String> hs = new HashSet<String>();

    hs.add("one");
    hs.add("two");
    hs.add("three");

    System.out.println("Here is the HashSet: " + hs);

    if (!hs.add("three"))
        System.out.println("Attempt to add duplicate. " + "Set is unchanged: " + hs);

    TreeSet<Integer> ts = new TreeSet<Integer>();

    ts.add(8);/*from   w w  w .j av a2s  .c o  m*/
    ts.add(19);
    ts.add(-2);
    ts.add(3);

    System.out.println(ts);

    System.out.println("First element in ts: " + ts.first());
    System.out.println("Last element in ts: " + ts.last());

    System.out.println("First element > 15: " + ts.higher(15));
    System.out.println("First element < 15: " + ts.lower(15));
}

From source file:Main.java

public static void main(String[] args) {
    // create set
    Set<String> set = new HashSet<String>();

    // populate the set
    set.add("A");
    set.add("B");
    set.add("from");
    set.add("java2s.com");

    // create a synchronized set
    Set<String> synset = Collections.synchronizedSet(set);

    System.out.println("Synchronized set is :" + synset);
}

From source file:Main.java

public static void main(final String[] args) {
    final Set<String[]> s = new HashSet<String[]>();
    final Set<List<String>> s2 = new HashSet<List<String>>();

    s.add(new String[] { "lucy", "simon" });
    s2.add(Arrays.asList(new String[] { "lucy", "simon" }));

    System.out.println(s.contains(new String[] { "lucy", "simon" })); // false
    System.out.println(s2.contains(Arrays.asList(new String[] { "lucy", "simon" }))); // true
}

From source file:Main.java

public static void main(String[] args) {
    Set<Integer> numberSet = new HashSet<Integer>() {
        {/*from   www .ja  v a2  s.c  o  m*/
            add(1);
            add(2);
            add(3);
        }
    };
    Stream<Integer> collectionStream = numberSet.stream();

    System.out.println(Arrays.toString(collectionStream.toArray()));
}

From source file:Main.java

public static void main(String[] args) {
    Set<Object> set = new HashSet<Object>();
    set.add("A");
    set.add(new Long(10));
    set.add(new Date());

    List<Object> list = new ArrayList<Object>(set);
    for (int i = 0; i < list.size(); i++) {
        Object o = list.get(i);//from  w  ww .ja  v  a2  s . c o  m
        System.out.println("Object = " + o);
    }
}