Collections.max() 不正确的参数

发布于 2024-10-24 09:55:55 字数 383 浏览 0 评论 0原文

我只是想找到“官员”列表的最大值。我正在处理的任务的规格不允许我对军官进行比较，因此我使用比较器来比较它们。

然而，编译器抱怨我的参数类型。谁能看出出了什么问题吗？（不用担心返回...我还没有这样做。）

在下面的片段之外，军官是列表<军官>；已初始化。

Collections.max(officers, new Comparator<Officer>()
    {
        public int compare( Officer a, Officer b )
        {
           return -1; //will do after
        }
    }
);

任何建议将不胜感激！

原文

I'm simply trying to find the max of a list of "Officers". The specs of the assignment I'm working on don't allow me to make the Officers comparable, so instead I'm using a Comparator to compare them.

However, the compiler is complaining about the types of my arguments. Can anyone see what's wrong? (Don't worry about the return... I haven't done that yet.)

Outside of the fragment below, officers is a List<Officer> which has been initialized.

Collections.max(officers, new Comparator<Officer>()
    {
        public int compare( Officer a, Officer b )
        {
           return -1; //will do after
        }
    }
);

Any suggestions would be appreciated!

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梦明 2024-10-31 09:55:55

这编译得很好。这是 ideone.com 演示

import java.util.*;

class Officer {
}

public class Test {

    public static void main(String[] args) {

        List<Officer> officers = new ArrayList<Officer>();

        Collections.max(officers, new Comparator<Officer>()
                {
                    public int compare( Officer a, Officer b )
                    {
                       return -1; //will do after
                    }
                }
            );
    }
}

因此，您发布的代码没有任何问题。一定是其他什么地方出了问题。

This compiles just fine. Here's an ideone.com demo

import java.util.*;

class Officer {
}

public class Test {

    public static void main(String[] args) {

        List<Officer> officers = new ArrayList<Officer>();

        Collections.max(officers, new Comparator<Officer>()
                {
                    public int compare( Officer a, Officer b )
                    {
                       return -1; //will do after
                    }
                }
            );
    }
}

So, nothing wrong with the code you posted. Must be something else that's wrong.

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