Create a collection containing the given number of random integers. - Java Collection Framework

Java examples for Collection Framework:Collection

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Description

Create a collection containing the given number of random integers.

Demo Code

/*/*from w  w w.  ja va2  s.  c o m*/
 * Copyright JTheque (Baptiste Wicht)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//package com.java2s;
import java.util.ArrayList;
import java.util.Collection;

import java.util.Random;

public class Main {
    public static void main(String[] argv) throws Exception {
        int size = 2;
        System.out.println(newRandomIntegerList(size));
    }

    private static final Random RANDOM = new Random();

    /**
     * Create a collection containing the given number of random integers.
     *
     * @param size The size of the collection.
     *
     * @return A Collection containing the given number of random integers.
     *
     * @throws IllegalArgumentException If size is less than 0.
     */
    public static Collection<Integer> newRandomIntegerList(int size) {
        if (size < 0) {
            throw new IllegalArgumentException(
                    "Size cannot be less than 0. ");
        }

        Collection<Integer> integers = new ArrayList<Integer>(size);

        for (int i = 0; i < size; i++) {
            integers.add(RANDOM.nextInt());
        }

        return integers;
    }
}

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