foreach循环map

Map<String, Integer> map = new HashMap<>();
map.put("one", 1);
map.put("two", 2);

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

map = {"one": 1, "two": 2}

for key, value in map.items():
    print(f"Key: {key}, Value: {value}")

const map = new Map([["one", 1], ["two", 2]]);

for (const [key, value] of map) {
    console.log(`Key: ${key}, Value: ${value}`);
}

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

List<Integer> newList = new ArrayList<>();
for (Integer value : originalList) {
    newList.add(value * 2); // 假设我们要将每个元素乘以2
}
originalList = newList;