Java中自定义对象的排序数组 [英] Sorting Array of Custom Object in Java

问题描述

我正在尝试将项目结束时间从最小到最大排序。

I am trying to sort the Project end times from smallest to largest values.

我创建了一个名为Project的自定义对象列表，并尝试根据由访问器返回的值。我已经重载了compare函数并收到错误：

I have created a list of custom objects called Project and am attempting to sort them based on a value returned by an accessor. I have overloaded the compare function and am receiving the error:

Collections类型中的sort（List，Comparator）方法不适用于参数（Project []，new Comparator（）{}）

The method sort(List, Comparator) in the type Collections is not applicable for the arguments (Project[], new Comparator(){})

下面显示了我主要代码，所有帮助

The code from my main is shown below, any and all help appreciated.

Collections.sort(projectList, new Comparator< Project>(){

    @Override
    public int compare(Project project1, Project project2)
    {   
       return compareProjects(project1, project2);}
    }
);

public static int compareProjects(Project project1, Project project2)
{ 
    if (project1.getEndTime() > project2.getEndTime())
        return 1;
    else
        return 0;
}

和我的项目类别：

public Project(int projectNum, int start, int end)
{
    this.projectNum = projectNum;
    this.start = start;
    this.end = end;
    this.length = end - start;
}

public static int getEndTime()
{
    return end;
}

推荐答案

Collections.sort对列表进行操作，而Arrays.sort对数组进行操作

需要更改 Project.class ，实现 Comparable interface

class Project implements Comparable<Project> {

    @Override
    public int compareTo(Project o) {
        if (this.getEndTime() > o.getEndTime())
        return 1;
    else
        return 0;
    }
}

然后在您的 main中。 class

Arrays.sort(projectList);

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