java - 比较Java中列表映射中的每个对象

Question

我有一个 Java 程序，其 Map 类型<String, Project>包含所有 Project 对象，并且 Project 的每个对象都包含一个相关 Process 对象的列表，即List<Process>.

public class Project {
    private String name;
    private Path path;
    private List<Process> processes;
        \\ getters and setters follow

和

public class Process {
    private String name;
    private String path;
    private String flow;
        \\getters and setters follow

我正在编写一个函数来查找每个（跨所有项目）JaroWinklerDistance之间的字符串距离（使用）。我想出了以下内容：flowProcess

    public void compareAllProcesses(Map<String, Project> projects) {
        Iterator<Project> projIter1 = projects.values().iterator();
        while(projIter1.hasNext()) {
            Project proj1 = projIter1.next();
            Iterator<Process> procIter1 = proj1.getProcesses().iterator();
            while(procIter1.hasNext()) {
                Process proc1 = procIter1.next();
                Iterator<Project> projIter2 = projects.values().iterator();
                while(projIter2.hasNext()) {
                    Project proj2 = projIter2.next();
                    Iterator<Process> procIter2 = proj2.getProcesses().iterator();
                    while(procIter2.hasNext()) {
                        Process proc2 = procIter2.next();
                        //use JaroWinklerDistance to compare proc1.getFlow() with proc2.getFLow()
                    }
                }
            }
        }
    }

有没有更有效和更优雅的方式来实现这一目标？

标签： javaperformancearraylisthashmapiterator

Answer 1

也许与Streams：

projects.values()
        .stream()
        .flatMap(p->p.getProcesses().stream())
        .forEach(proc1 ->  projects.values()
                                   .stream()
                                   .flatMap(p->p.getProcesses().stream())
                                   .forEach(proc2 -> {/*do something with proc1 and proc2*/});