HashMap转换成String数组并成对输出键值对

可以通过以下代码将HashMap转换成String数组并成对输出键值对：

HashMap<String, String> hashMap = new HashMap<>();
hashMap.put("key1", "value1");
hashMap.put("key2", "value2");
hashMap.put("key3", "value3");

String[] keyValuePairs = new String[hashMap.size()];
int i = 0;
for (Map.Entry<String, String> entry : hashMap.entrySet()) {
    keyValuePairs[i] = entry.getKey() + ":" + entry.getValue();
    i++;
}

for (String pair : keyValuePairs) {
    System.out.println(pair);
}

输出结果：

key1:value1
key2:value2
key3:value3