java - Java 中的方法重载 : The method is not applicable for arguments

Question

我正在尝试使用谓词，但我不能，因为方法重载正在起作用...

我想对数组 (varargs) 使用 filter，并且我想在谓词中使用内置方法，过滤转换为列表的数组。

这是错误:类型 Predicates 中的方法 filter(Iterable, Predicate) 不适用于参数 (Class[], Predicate)

private static final Predicate<Method> isTestMethod = new Predicate<Method>() {
    @Override
    public boolean evaluate(Method input) {
        return input.isAnnotationPresent(Test.class);
    }
};

public static void testClasses(Class<?>... classes) {
    for (Method method : filter(classes, isTestMethod)) {

    }
}

这是谓词方法:

/**
 * Returns the elements of <tt>unfiltered</tt> that satisfy a predicate.
 * 
 * @param unfiltered An iterable containing objects of any type
 * that will be filtered and used as the result.
 * @param predicate The predicate to use for evaluation.
 * @return An iterable containing all objects which passed the predicate's evaluation.
 */
public static <T> Iterable<T> filter(Iterable<T> unfiltered, Predicate<T> predicate) {
    checkNotNull(unfiltered);
    checkNotNull(predicate);

    List<T> result = new ArrayList<T>();
    Iterator<T> iterator = unfiltered.iterator();
    while (iterator.hasNext()) {
        T next = iterator.next();
        if (predicate.evaluate(next)) {
            result.add(next);
        }
    }
    return result;
}

/**
 * Returns the elements of <tt>unfiltered</tt> that satisfy a predicate.
 * 
 * @param unfiltered An array containing objects of any type
 * that will be filtered and used as the result.
 * @param predicate The predicate to use for evaluation.
 * @return An iterable containing all objects which passed the predicate's evaluation.
 */
public static <T> Iterable<T> filter(T[] unfiltered, Predicate<T> predicate) {
    return filter(Arrays.asList(unfiltered), predicate);
}

Answer 1

您的过滤器适用于方法 - 但您有一组类。您不能将您的 isTestMethod 谓词应用于类...

您预计它会做什么？您是否正在寻找一个过滤器来匹配具有任何测试方法的类？