Java JUnit:方法 X 对于类型 Y 不明确 [英] Java JUnit: The method X is ambiguous for type Y

问题描述

我有一些测试工作正常.然后，我将它移到另一个包中，现在出现错误.代码如下:

I had some tests working fine. Then, I moved it to a different package, and am now getting errors. Here is the code:

import static org.junit.Assert.*;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.jgrapht.Graphs;
import org.jgrapht.WeightedGraph;
import org.jgrapht.graph.DefaultWeightedEdge;
import org.jgrapht.graph.SimpleWeightedGraph;
import org.junit.*; 

@Test
    public void testEccentricity() {
        WeightedGraph<String, DefaultWeightedEdge> g = generateSimpleCaseGraph();
        Map<String, Double> eccen = JGraphtUtilities.eccentricities(g);

        assertEquals(70, eccen.get("alpha"));
        assertEquals(80, eccen.get("l"));
        assertEquals(130, eccen.get("l-0"));
        assertEquals(100, eccen.get("l-1"));
        assertEquals(90, eccen.get("r"));
        assertEquals(120, eccen.get("r-0"));
        assertEquals(130, eccen.get("r-1"));
    }

错误信息是这样的:

assertEquals(Object, Object) 方法对于 JGraphtUtilitiesTest 类型不明确

我该如何解决这个问题?为什么当我将类移到不同的包时会出现这个问题?

How can I fix this? Why did this problem occur as I moved the class to a different package?

推荐答案

assertEquals(Object, Object) 方法对于类型不明确...

The method assertEquals(Object, Object) is ambiguous for the type ...

此错误意味着您将 double 和 Double 传递给具有两个不同签名的方法:assertEquals(Object, Object) 和 assertEquals(double, double) 由于自动装箱，这两个都可以被调用.

What this error means is that you're passing a double and and Double into a method that has two different signatures: assertEquals(Object, Object) and assertEquals(double, double) both of which could be called, thanks to autoboxing.

为避免歧义，请确保您调用 assertEquals(Object, Object)(通过两个双精度)或 assertEquals(double, double)(通过两次双打).

To avoid the ambiguity, make sure that you either call assertEquals(Object, Object) (by passing two Doubles) or assertEquals(double, double) (by passing two doubles).

因此，在您的情况下，您应该使用:

So, in your case, you should use:

assertEquals(Double.valueOf(70), eccen.get("alpha"));

或者:

assertEquals(70.0d, eccen.get("alpha").doubleValue());

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