Java Iterable First equal(Iterable first, Iterable second)

Description

Compare elements, sort order and length

License

Apache License

Parameter

Parameter	Description
T	Type of iterable to compare.
first	First iterable to compare.
second	Second iterable to compare.

Return

True if equal, false otherwise.

Declaration

public static <T> boolean equal(Iterable<T> first, Iterable<T> second) 

Method Source Code

//package com.java2s;
/*//from   w  ww .  j a  va  2  s.com
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

import java.util.Iterator;

public class Main {
    /**
     * Compare elements, sort order and length
     *
     * @param <T>    Type of iterable to compare.
     * @param first  First iterable to compare.
     * @param second Second iterable to compare.
     * @return True if equal, false otherwise.
     */
    public static <T> boolean equal(Iterable<T> first, Iterable<T> second) {
        return equal(first.iterator(), second.iterator());
    }

    /**
     * Compare elements, sort order and length
     *
     * @param <T>    Type of iterable to compare.
     * @param first  First iterable to compare.
     * @param second Second iterable to compare.
     * @return True if equal, false otherwise.
     */
    public static <T> boolean equal(Iterator<T> first, Iterator<T> second) {
        while (first.hasNext() && second.hasNext()) {
            T message = first.next();
            T otherMessage = second.next(); /* element-wise equality */
            if (!(message == null ? otherMessage == null : message.equals(otherMessage))) {
                return false;
            }
        }
        /* length must also be equal */
        return !(first.hasNext() || second.hasNext());
    }
}

Related

1. first(final Iterable iterable)
2. first(final Iterable iter)
3. first(Iterable iterable)
4. first(Iterable i)