HashMap的getOrDefault()方法

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wx628dd70197058 2022-05-26 01:48:01 博主文章分类：安全领域 ©著作权

文章标签 hashmap 可靠获取值 文章分类 OpenStack 云计算

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HashMap的getOrDefault()方法

    /**
     * Created by 谭健 2017/8/24. 21:42.
     * All Rights Reserved
     */
    public static void main(String[] args) {
        HashMap hashMap = new HashMap<>();
        hashMap.putIfAbsent("orderId", "20170824222735412201");
        hashMap.putIfAbsent("userId","1012758623");
        hashMap.putIfAbsent("mobilePhone", "15197447018");
        hashMap.getOrDefault("orderId", "19700000000000000000");
        hashMap.getOrDefault("userId", "1000000000");
        hashMap.getOrDefault("mobilePhone", "10000000000");
        // old
        if (hashMap.containsKey("orderId")) {
            String orderId = (String) hashMap.get("orderId");
            if (null == orderId || "".equals(orderId)) {
                orderId = "19700000000000000000";
            }
        }
    }