Example usage for java.util Set size

Introduction

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

Prototype

int size();

Source Link

Document

Returns the number of elements in this set (its cardinality).

Usage

From source file:Main.java

public static <T> Set<T> toImmutableSet(Set<T> set) {
    switch (set.size()) {
    case 0:/*from  w w w.ja  va  2s  .c o  m*/
        return Collections.emptySet();
    case 1:
        return Collections.singleton(set.iterator().next());
    default:
        return Collections.unmodifiableSet(set);
    }
}

From source file:Main.java

public static <T> boolean overlaps(Set<T> a, Set<T> b) {
    if (a.size() > b.size()) {
        Set<T> t = a;//  w  ww .ja  va  2s.  c  o m
        a = b;
        b = t;
    }
    for (T elem : a) {
        if (b.contains(elem)) {
            return true;
        }
    }
    return false;
}

From source file:Main.java

public static <T> List<T> setToList(Set<T> set) {
    List<T> list = new ArrayList<>(set.size());
    list.addAll(set);// w  ww  .ja v  a2s  .c o  m
    return list;
}

From source file:Main.java

public static String[] clean(String[] input) {
    Set<String> unique = new TreeSet<>(Arrays.asList(input));
    return unique.toArray(new String[unique.size()]);
}

From source file:Main.java

public static <T> boolean hasDuplicates(Collection<T> collection) {
    Set<T> set = new HashSet<T>(collection);
    return set.size() != collection.size();
}

From source file:Main.java

public static boolean intersects(Set<?> a, Set<?> b) {
    if (a.size() < b.size()) {
        for (Object obj : a) {
            if (b.contains(obj)) {
                return true;
            }//from  ww  w .j  a va 2 s  . c o  m
        }
    } else {
        for (Object obj : b) {
            if (a.contains(obj)) {
                return true;
            }
        }
    }
    return false;
}

From source file:Main.java

public static <T> List<T> setToList(Set<T> set) {
    List<T> list = new ArrayList<T>(set.size());
    list.addAll(set);//from  www  .jav  a  2  s . c o  m
    return list;
}

From source file:Main.java

public static String[] toArray(Set<String> set) {
    return set.toArray(new String[set.size()]);
}

From source file:Main.java

public static String getMapString(Map map) {
    Set set = map.keySet();
    if (set.size() < 1) {
        return "[]";
    }/* ww  w  .j a v  a2s. c o m*/
    StringBuilder strBuilder = new StringBuilder();
    Object[] array = set.toArray();
    strBuilder.append("[").append(array[0]).append("=").append(map.get(array[0]));
    for (int i = 1; i < array.length; ++i) {
        strBuilder.append(", ");
        strBuilder.append(array[i]).append("=");
        strBuilder.append(map.get(array[i]));
    }
    strBuilder.append("]");
    return strBuilder.toString();
}

From source file:Main.java

private synchronized static int getLastKey() {
    Set<Integer> set = mapNotify.keySet();
    if (set.size() == 0) {
        return 0;
    }//w  ww  .  j a va2s  .  c o m
    return (int) set.toArray()[set.size() - 1];
}