Java如何实现作业调度

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Java实现作业调度

要求

Java实现SJF算法调度，要求测试数据可以随即输入或从文件中读入；

必须要考虑到作业的到达时间；

最终能够计算每一个作业的周转时间、带权周转时间，给代码加中文注释

参考代码

import java.util.ArrayList;import java.util.Comparator;import java.util.List;import java.util.Random;public class test {        static class Job {        public int jobId;        public int arriveTime;        public int needTime;        public int finishTime;        public int turnover;        public double weightTurnover;        public Job(int jobId, int arriveTime, int needTime) {            this.jobId = jobId;            this.arriveTime = arriveTime;            this.needTime = needTime;        }    }    public static void main(String[] args) {        List<Job> jobList = new ArrayList<>();        Random random = new Random();          int jobSize = 5;          int rangeArriveTime = 5;          int rangeNeedTime = 10;           for (int i = 0; i < jobSize; i++) {            Job job = new Job(i, random.nextInt(rangeArriveTime), random.nextInt(rangeNeedTime) + 1);            jobList.add(job);        }        jobList.sort(Comparator.comparingInt(o -> o.arriveTime));        int currentTime = 0;          int totalTurnover = 0;          double totalWeightTurnover = 0;          int completeJobNum = 0;          while (completeJobNum < jobList.size()) {            int shortestNeedTime = Integer.MAX_VALUE;            Job shortestNeedJob = null;                        for (Job job : jobList) {                if (job.finishTime > 0) {                     continue;                }                if (job.arriveTime <= currentTime && job.needTime < shortestNeedTime) {                      shortestNeedTime = job.needTime;                    shortestNeedJob = job;                }            }            currentTime += shortestNeedJob.needTime;              shortestNeedJob.finishTime = currentTime;              shortestNeedJob.turnover = shortestNeedJob.finishTime - shortestNeedJob.arriveTime;              shortestNeedJob.weightTurnover = (double) shortestNeedJob.turnover / shortestNeedJob.needTime;              totalTurnover += shortestNeedJob.turnover;              totalWeightTurnover += shortestNeedJob.weightTurnover;              completeJobNum++;          }        for (Job job : jobList) {            System.out.println("作业" + job.jobId + "的周转时间为" + job.turnover + "，带权周转时间为" + job.weightTurnover);        }        System.out.println("平均周转时间为" + (double) totalTurnover / jobList.size());        System.out.println("带权平均周转时间为" + totalWeightTurnover / jobList.size());    }}

运行效果

感谢各位的阅读，以上就是“Java如何实现作业调度”的内容了，经过本文的学习后，相信大家对Java如何实现作业调度这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是编程网，小编将为大家推送更多相关知识点的文章，欢迎关注！