java遍历map的几种方法

以下是Java遍历Map对象的几种方法：
1. 使用for-each循环遍历Map对象

Map<String, Integer> map = new HashMap<>();
for (Map.Entry<String, Integer> entry : map.entrySet()) {
    String key = entry.getKey();
    Integer value = entry.getValue();
    System.out.println("Key: " + key + ", Value: " + value);
}

2. 使用Lambda表达式遍历Map对象

Map<String, Integer> map = new HashMap<>();
map.forEach((key, value) -> System.out.println("Key: " + key + ", Value: " + value));

3. 使用Iterator迭代器遍历Map对象

Map<String, Integer> map = new HashMap<>();
Iterator<Map.Entry<String, Integer>> iterator = map.entrySet().iterator();
while (iterator.hasNext()) {
    Map.Entry<String, Integer> entry = iterator.next();
    String key = entry.getKey();
    Integer value = entry.getValue();
    System.out.println("Key: " + key + ", Value: " + value);
}

4. 使用Stream API遍历Map对象

Map<String, Integer> map = new HashMap<>();
map.entrySet().stream().forEach(entry -> System.out.println("Key: " + entry.getKey() + ", Value: " + entry.getValue()));