JMock with（instanceOf（Integer.Class））在Java 8中无法编译

Question

The method with(Matcher<Object>) is ambiguous for the type new Expectations(){}

它是由以下方法调用引起的：

import org.jmock.Expectations;

public class Ambiguous {
    public static void main(String[] args) {
        Expectations expectations = new Expectations();
        expectations.with(org.hamcrest.Matchers.instanceOf(Integer.class));
    }
}

似乎with是从返回的instanceOf()与with()期望的内容不明确，反之亦然。有办法解决吗？

Answer 1

有一些简单的方法可以帮助编译器。

将匹配器分配给局部变量：

public static void main(String[] args) {
    Expectations expectations = new Expectations();
    Matcher<Integer> instanceOf = Matchers.instanceOf(Integer.class);
    expectations.with(instanceOf);
}

可以使用类型见证符指定类型参数,如下所示：

public static void main(String[] args) {
    Expectations expectations = new Expectations();
    expectations.with(Matchers.<Integer>instanceOf(Integer.class));
}

public static void main(String[] args) {
    Expectations expectations = new Expectations();
    expectations.with(instanceOf(Integer.class));
}

public static <T> Matcher<T> instanceOf(Class<T> type) {
    return Matchers.instanceOf(type);
}