com.meizu.maegis.captcha.sdk.utils.CollectionUtils Maven / Gradle / Ivy

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package com.meizu.maegis.captcha.sdk.utils;

import java.util.Collection;
import java.util.List;
import java.util.Map;

/**
 * Created by wangxinguo on 2016-8-23.
 */
public class CollectionUtils {


    /**
     * Return {@code true} if the supplied Collection is {@code null}
     * or empty. Otherwise, return {@code false}.
     *
     * @param collection the Collection to check
     * @return whether the given Collection is empty
     */
    public static boolean isEmpty(Collection collection) {
        return (collection == null || collection.isEmpty());
    }

    /**
     * Return {@code true} if the supplied Map is {@code null}
     * or empty. Otherwise, return {@code false}.
     *
     * @param map the Map to check
     * @return whether the given Map is empty
     */
    public static boolean isEmpty(Map map) {
        return (map == null || map.isEmpty());
    }

    public static boolean isNotEmpty(Map map) {
        return !isEmpty(map);
    }


    /**
     * 将List中的数据组成用逗号分隔的字符串，如a,b,c
     *
     * @param strList
     * @return
     */
    public static String list2Str(List strList) {
        String resultStr = "";
        if (!CollectionUtils.isEmpty(strList)) {
            for (int i = 0; i < strList.size(); i++) {
                resultStr = resultStr + strList.get(i) + ',';
            }
            resultStr = resultStr.substring(0, resultStr.length() - 1);
        }
        return resultStr;
    }
}