java - Java中自定义对象的数组排序

Question

我正在尝试按从最小到最大值的顺序对项目结束时间进行排序。

我创建了一个名为 Project 的自定义对象列表，并尝试根据访问器返回的值对它们进行排序。我已经重载了比较函数并收到错误:

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

我的主要代码如下所示，感谢任何和所有帮助。

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:

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;
}

Answer 1

Collections.sort operates on a List, and Arrays.sort operates on an array

需要更改Project.class，实现Comparable接口(interface)

class Project implements Comparable<Project> {

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

然后在你的main.class

Arrays.sort(projectList);