Map集合遍历的五种方式

1.通过Map.KeySet遍历key和value

for (String key : map.keySet()) {
            String value = map.get(key);
            System.out.println("key: " + key + " value: " + value);
        }

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2.通过Map.entrySet使用iterator遍历key和value

Iterator> iterator = map.entrySet().iterator();
        while (iterator.hasNext()) {
            Map.Entry entry = iterator.next();
            System.out.println("key: " + entry.getKey() + " value: " + entry.getValue());
        }

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3.通过Map.entrySet遍历key和value

for (Map.Entry entry : map.entrySet()) {
            System.out.println("key: " + entry.getKey() + " value: " + entry.getValue());
        }

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4.通过Map.values()遍历value,无法遍历key

for (String value : map.values()) {
            System.out.println(" value: " + value);
        }

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5.通过Map.keySet()key,无法遍历value

for (String key : map.keySet()) {
            System.out.println(" key: " + key);
        }
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原文：https://blog.csdn.net/yf_man/article/details/78183082