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 removeDuplicateWithOrder(List arlList) {
    Set set = new HashSet();
    List newList = new ArrayList();
    for (Iterator iter = arlList.iterator(); iter.hasNext();) {
        Object element = iter.next();
        if (set.add(element))
            newList.add(element);/*from w ww.  ja v  a  2s.  c o m*/
    }
    arlList.clear();
    arlList.addAll(newList);
}

From source file:Main.java

public static String[] union(String[] arr1, String[] arr2) {
    Set<String> set = new HashSet<>();
    Collections.addAll(set, arr1);
    Collections.addAll(set, arr2);
    String[] result = {};/*from w  ww.  j  a  va 2  s  . co  m*/
    return set.toArray(result);
}

From source file:Main.java

@SafeVarargs
public static <T> HashSet<T> newHashSet(T... ts) {
    HashSet<T> set = new HashSet<T>();
    for (T t : ts) {
        set.add(t);/* w  w  w  .j  a va2  s.c om*/
    }
    return set;
}

From source file:Main.java

public static <T> Set<T> toSet(Set<T> set, T... arr) {
    if (set == null) {
        set = new HashSet<T>();
    }/*w  w w  . j  ava 2 s . c  o  m*/

    return (Set<T>) copy(set, arr);
}

From source file:Main.java

public static <T> T getFirstDuplicateValue(Collection<T> collection) {
    Set<T> set = new HashSet<T>();
    // Set#add returns false if the set does not change, which
    // indicates that a duplicate element has been added.
    for (T each : collection) {
        if (!set.add(each))
            return each;
    }//  ww  w.jav a2  s  .co m
    return null;
}

From source file:Main.java

public static void filterSets() {
    Set<String> words = new HashSet<>();
    words.add("1");
    words.add("2");
    words.add("3");
    Set<String> filteredSet = Sets.filter(words, new Predicate<String>() {
        @Override/*from ww w .  j a va2s .  co m*/
        public boolean apply(String input) {
            return input.equals("1");
        }
    });

    System.out.println(Iterables.toString(filteredSet));

}

From source file:Main.java

/**
 * @param <T>/*ww w .  j  av  a 2 s.c  o m*/
 * @param list
 * @return list
 */
public static <T> Set<T> list2Set(List<T> list) {
    Set<T> set = new HashSet<T>();
    for (T t : list) {
        set.add(t);
    }
    return set;
}

From source file:Main.java

public static <T> List<T> union(List<T> list1, List<T> list2) {
    Set<T> set = new HashSet<T>();

    set.addAll(list1);// w  ww.j a v  a2 s.c  o  m
    set.addAll(list2);

    return new ArrayList<T>(set);
}

From source file:Main.java

public static <T> Set<String> toStringSet(Collection<T> a_values)
/*     */ {/*from  w  w w  . j  a  v a  2 s .c o m*/
    /* 443 */Set values = new HashSet();
    /*     */
    /* 445 */for (Iterator i$ = a_values.iterator(); i$.hasNext();) {
        Object value = i$.next();
        /*     */
        /* 447 */values.add(value.toString());
        /*     */}
    /*     */
    /* 450 */return values;
    /*     */}

From source file:Main.java

public static <T> Set<Class<? extends T>> filter(Collection<Class<? extends T>> source, String packageFilter) {
    Set<Class<? extends T>> filtered = new HashSet<Class<? extends T>>();
    for (Class<? extends T> klazz : source) {
        if (klazz.getName().startsWith(packageFilter))
            filtered.add(klazz);/* w  w  w.j  a v  a2s . c  o  m*/
    }
    return filtered;
}