Java遍历Map.Entry键值对方法

Map<String, Integer> map = new HashMap<>();
map.put("apple", 1);
map.put("banana", 2);
map.put("orange", 3);

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

Iterator<Map.Entry<String, Integer>> iterator = map.entrySet().iterator();
while (iterator.hasNext()) {
    Map.Entry<String, Integer> entry = iterator.next();
    System.out.println("Key: " + entry.getKey() + ", Value: " + entry.getValue());
    
    // 可以安全删除
    if ("apple".equals(entry.getKey())) {
        iterator.remove();
    }
}

map.forEach((key, value) -> {
    System.out.println("Key: " + key + ", Value: " + value);
});