Example usage for java.util ArrayList addAll

Introduction

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

Prototype

public boolean addAll(Collection<? extends E> c)

Source Link

Document

Appends all of the elements in the specified collection to the end of this list, in the order that they are returned by the specified collection's Iterator.

Usage

From source file:Main.java

public static <T> List<T> union(List<T> list1, List<T> list2) {
    ArrayList<T> result = new ArrayList<>(list1);
    result.addAll(list2);
    return result;
}

From source file:Main.java

/**
 * create list from array// w  w  w.  j  a v a2s  .c  o  m
 *
 * @param <T>
 * @param values
 * @return array values in list
 */
public static <T> ArrayList<T> fromArray(T... values) {
    ArrayList<T> list = new ArrayList<T>();
    list.addAll(Arrays.asList(values));
    return list;
}

From source file:Main.java

public static int countCommElmts(ArrayList<String> u, ArrayList<String> v) {
    ArrayList<String> listOne = new ArrayList<String>();
    listOne.addAll(u);
    listOne.retainAll(v);/*from   w  w w.  j  a v  a 2  s.  c  om*/
    return listOne.size();
}

From source file:Main.java

public static <T> ArrayList<T> newArrayList(T... elements) {
    List<T> tmp = Arrays.asList(elements);

    if (tmp instanceof ArrayList) {
        return (ArrayList<T>) tmp;
    }//  w w  w  .ja  v  a2s . c  om

    ArrayList<T> result = new ArrayList<T>();
    result.addAll(tmp);
    return result;
}

From source file:Main.java

public static <T> ArrayList<T> toArrayList(Object[] arr) {
    List list = toList(arr);//w  w  w .j  ava2 s  . c o  m
    ArrayList<T> arrayList = new ArrayList<T>();
    arrayList.addAll(list);
    return arrayList;
}

From source file:Main.java

/**
 * Concatenate two String arrays.// w  ww  . j av  a 2 s .  c  o  m
 * @param array1 cannot be null.
 * @param array2 cannot be null.
 * @return result.
 */
public static String[] concat(String[] array1, String[] array2) {
    ArrayList<String> result = new ArrayList<>();
    result.addAll(Arrays.asList(array1));
    result.addAll(Arrays.asList(array2));
    String[] array = new String[result.size()];
    result.toArray(array);
    return array;
}

From source file:Main.java

public static <T> List<T> readOnlyCopy(List<T> orig) {
    if (orig.isEmpty())
        return Collections.emptyList();
    if (orig.size() == 1)
        return Collections.singletonList(orig.get(0));
    ArrayList<T> copy = new ArrayList<>(orig.size());
    copy.addAll(orig);
    return Collections.unmodifiableList(copy);
}

From source file:Main.java

public static <T> List<T> concat(Collection<? extends T> xs, Collection<? extends T> ys) {
    ArrayList<T> result = new ArrayList<>(xs.size() + ys.size());
    result.addAll(xs);
    result.addAll(ys);/*from   w w  w  .ja  v a 2s .co m*/
    return result;
}

From source file:Main.java

public static <T> ArrayList<T> toArrayList(Collection<T> col) {
    ArrayList<T> list = new ArrayList<T>();
    if (col != null) {
        list.addAll(col);
    }/*ww w .  j  a  v  a  2  s . c  o m*/
    return list;
}

From source file:Main.java

/**
 * Return the first N items in a collection.
 *
 *///w w  w. j  a v a2s  .c  o  m
public static <T> List<T> head(Collection<T> input, int count) {

    List<T> result = Lists.newArrayList();

    ArrayList<T> tmp = Lists.newArrayList();
    tmp.addAll(input);

    for (int i = 0; i < input.size(); i++) {

        if (result.size() == count)
            break;

        result.add(tmp.get(i));

    }

    return result;

}