hasmap中的hashmap打印输出

HashMap<String, Integer> hashMap = new HashMap<>();
hashMap.put("Apple", 10);
hashMap.put("Orange", 15);
hashMap.put("Banana", 20);

Iterator<Map.Entry<String, Integer>> iterator = hashMap.entrySet().iterator();
while (iterator.hasNext()) {
    Map.Entry<String, Integer> entry = iterator.next();
    System.out.println(entry.getKey() + " : " + entry.getValue());
}

HashMap<String, Integer> hashMap = new HashMap<>();
hashMap.put("Apple", 10);
hashMap.put("Orange", 15);
hashMap.put("Banana", 20);

hashMap.forEach((key, value) -> System.out.println(key + " : " + value));

Apple : 10
Orange : 15
Banana : 20