Java如何实现作业调度-java教程-PHP中文网

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

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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 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

Java如何实现作业调度