Example usage for java.util Collection clear

Introduction

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

Prototype

void clear();

Source Link

Document

Removes all of the elements from this collection (optional operation).

Usage

From source file:Main.java

  public static void main(String[] args) {
  Collection<String> names = new ArrayList<>();
  System.out.printf("Size = %d, Elements = %s%n", names.size(), names);
  names.add("XML");
  names.add("HTML");
  names.add("CSS");
  System.out.printf("Size   = %d, Elements   = %s%n",
      names.size(), names);/*from w w  w.  jav a 2  s.c om*/
  names.remove("CSS");
  System.out.printf("Size   = %d, Elements   = %s%n",
      names.size(), names);
  names.clear();
  System.out.printf("Size   = %d, Elements   = %s%n",
      names.size(), names);
}

From source file:Main.java

public static <T> void replaceValuesInCollection(Collection<T> from, Collection<T> to) {
    to.clear();
    if (from != null) {
        to.addAll(from);//from  www. j  a va 2s  . c  o m
    }
}

From source file:Main.java

public static void clear(Collection c) {
    if (c != null) {
        c.clear();
    }
}

From source file:Main.java

public static <T> Collection<T> defaultCollection(Collection<T> col, int size, T defaultValue) {
    try {/*  w  ww.  j av a 2  s. c om*/
        col.clear();
    } catch (Exception e) {
    }
    for (int i = 0; i < size; i++) {
        col.add(defaultValue);
    }
    return col;
}

From source file:Main.java

public static int clear(final Collection collection) {
    final int size = collection.size();
    collection.clear();
    return size;// w  w w . j  a  v  a 2 s  .co  m
}

From source file:Main.java

/**
 * Removes all elements from the given collection.
 *
 * @param collection    The collection to be cleared.
 * @param <E>           The component type of the collection.
 * @return              The cleared collection.
 *//*from  w w  w  .j av a2  s. c o  m*/
public static <E> Collection<E> clear(Collection<E> collection) {
    if (collection != null) {
        collection.clear();
    }
    return collection;
}

From source file:org.opoo.util.CollectionUtils.java

public static void fill(Collection c, Object val, int size) {
    c.clear();
    int i = 0;//w  w w  .ja  v  a2  s  .co m
    while (i < size) {
        c.add(val);
        i++;
    }
}

From source file:Main.java

/** Copy elements from src to dest.
 * //from  w  ww  . ja v a  2 s  . c  o  m
 * @param src - Collection containing data to be copied.
 * @param dest - Collection to have the data copied to.
 * @param clearDestination - whether to clear all contents from destination prior to copying.
 */
public static <T> void copyElements(Collection<? extends T> src, Collection<? super T> dest,
        boolean clearDestination) {
    if (clearDestination) {
        dest.clear();
    }
    for (T t : src) {
        dest.add(t);
    }
}

From source file:Main.java

public static void decodeFromString(final Collection<Long> values, final String q, int maxLen) {
    values.clear();
    if (q == null) {
        return;//w  w  w.jav  a 2 s  .  co m
    }

    int qlen = q.length();
    if (qlen <= 1) {
        return;
    }
    long n = 0;
    int shift = 0;
    for (int i = 0; i < qlen; i++) {
        char c = q.charAt(i);
        if (c == ';') {
            if (maxLen > 0 && n >= maxLen) {
                // bogus history data
                values.clear();
                break;
            }
            values.add(n);
            n = 0;
            shift = 0;
        } else {
            if (c >= '0' && c <= '9') {
                n += ((c - '0') << shift);
            } else if (c >= 'a' && c <= 'f') {
                n += ((10 + c - 'a') << shift);
            } else {
                // bogus history data
                values.clear();
                break;
            }
            shift += 4;
        }
    }
}

From source file:Main.java

/**
 * Remove all object from collection to other collection
 * @param <T>//from  www .ja  v  a2s .co  m
 * @param from source collection
 * @param to target collection
 */
public static <T> void moveAllObject(Collection<T> from, Collection<T> to) {
    if (!from.isEmpty()) {
        to.addAll(from);
        from.clear();
    }
}