Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

import java.util.Collection;

public class Main {
    /**
     * Join several all provided collections in the first one provided.<br />
     * The instance of the target collection is returned to ease use in foreach loops.
     * @param <T>
     *        the type of the elements contained in the collection.
     * @param target
     *        the target collection
     * @param collections
     *        the collections of items to add in the target collection.
     * @return the first collection, with the other items of the collection added.
     */
    @SafeVarargs
    public static <T> Collection<T> joinCollections(final Collection<T> target,
            final Collection<? extends T>... collections) {
        if (target == null) {
            throw new IllegalArgumentException("Cannot join collection in null target");
        }
        if (collections.length == 0) {
            return target;
        }

        for (final Collection<? extends T> collection : collections) {
            target.addAll(collection);
        }
        return target;
    }
}