Converts two List to a map. - Android java.util

Android examples for java.util:Map

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Description

Converts two List to a map.

Demo Code

/*//from   w w  w.j av  a2 s . c  om
 * --------------------
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2008-2009 Sun Microsystems, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of the Common Development
 * and Distribution License("CDDL") (the "License").  You may not use this file
 * except in compliance with the License.
 *
 * You can obtain a copy of the License at
 * http://opensource.org/licenses/cddl1.php
 * See the License for the specific language governing permissions and limitations
 * under the License.
 *
 * When distributing the Covered Code, include this CDDL Header Notice in each file
 * and include the License file at http://opensource.org/licenses/cddl1.php.
 * If applicable, add the following below this CDDL Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 */
//package com.book2s;

import java.util.HashMap;

import java.util.Iterator;
import java.util.List;
import java.util.Map;

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

    /**
     * Converts two {@link List} to a map. The order is important here because
     * each key will map to one value.
     */
    public static <T, K> Map<T, K> newMapFromLists(List<T> keys,
            List<K> values) {
        // throw if there's invalid input..
        if (keys.size() != values.size()) {
            throw new IllegalArgumentException();
        }
        Map<T, K> map = new HashMap<T, K>(keys.size());
        Iterator<T> keyIter = keys.iterator();
        Iterator<K> valueIter = values.iterator();
        while (keyIter.hasNext() && valueIter.hasNext()) {
            T key = keyIter.next();
            K value = valueIter.next();
            map.put(key, value);
        }
        return map;
    }
}

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