将类型传递给泛型方法(嵌套泛型)

public class GenericMethodExample {
    public static void main(String[] args) {
        // 调用泛型方法，指定类型参数为String
        GenericMethod<String> genericMethod = new GenericMethod<>();
        genericMethod.printList(Arrays.asList("Hello", "World"));
    }
}

class GenericMethod<T> {
    public void printList(List<T> list) {
        for (T item : list) {
            System.out.println(item);
        }
    }
}

public class GenericMethodExample {
    public static void main(String[] args) {
        // 调用泛型方法，指定类型参数为String和Integer
        GenericMethod<String, Integer> genericMethod = new GenericMethod<>();
        genericMethod.printMap(new HashMap<String, Integer>() {{
            put("Hello", 1);
            put("World", 2);
        }});
    }
}

class GenericMethod<K, V> {
    public void printMap(Map<K, V> map) {
        for (Map.Entry<K, V> entry : map.entrySet()) {
            System.out.println(entry.getKey() + " -> " + entry.getValue());
        }
    }
}