Determine whether the given Collection only contains a single unique object. - Android java.util

Android examples for java.util:Collection Contains

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Description

Determine whether the given Collection only contains a single unique object.

Demo Code

/*//w  w w.j  a v  a  2  s. c  om
 * Copyright 2002-2014 the original author or authors.
 *
 * 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.book2s;
import java.util.*;

public class Main {
    public static void main(String[] argv) {
        Collection collection = java.util.Arrays.asList("asdf",
                "book2s.com");
        System.out.println(hasUniqueObject(collection));
    }

    /**
     * Determine whether the given Collection only contains a single unique object.
     * @param collection the Collection to check
     * @return {@code true} if the collection contains a single reference or
     * multiple references to the same instance, {@code false} else
     */
    public static boolean hasUniqueObject(Collection<?> collection) {
        if (isEmpty(collection))
            return false;
        boolean hasCandidate = false;
        Object candidate = null;
        for (Object elem : collection) {
            if (!hasCandidate) {
                hasCandidate = true;
                candidate = elem;
            } else if (candidate != elem) {
                return false;
            }
        }
        return true;
    }

    public static boolean isEmpty(Collection<?> collection) {
        return (collection == null || collection.isEmpty());
    }
}

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