traverse Map and dump to String - Android java.util

Android examples for java.util:Map

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Description

traverse Map and dump to String

Demo Code

/*//from w w  w . j  a v  a2 s .  co  m
 * Copyright (C) 2016 venshine.cn@gmail.com
 *
 * 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.Map;

public class Main {
    private static final String DELIMITER = ",";

    public static <K, V> String traverseMap(Map<K, V> map) {
        if (!isEmpty(map)) {
            int len = map.size();
            StringBuilder builder = new StringBuilder(len);
            int i = 0;
            for (Map.Entry<K, V> entry : map.entrySet()) {
                if (entry == null) {
                    continue;
                }
                builder.append(entry.getKey().toString() + ":"
                        + entry.getValue().toString());
                i++;
                if (i < len) {
                    builder.append(DELIMITER);
                }
            }
            return builder.toString();
        }
        return null;
    }

    /**
     * Judge whether a map is null or size is 0
     *
     * @param map
     * @param <K>
     * @param <V>
     * @return
     */
    public static <K, V> boolean isEmpty(Map<K, V> map) {
        return (map == null || map.size() == 0);
    }
}

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