java - 如何将包含整数和字符串的文本文件读入数组

Question

我读入了一个包含整数和字符串的文本文件，我需要使用所有四种信息来计算:

1. 吞吐量
2. 平均等待时间
3. 平均周转时间
4. 使用先来先服务和最短剩余时间处理器算法的操作系统的 CPU 空闲时间。 (此外，页面错误正在作为字符串读取，但在文本文件中看起来像这样:"12, 7, 5, 79")

我应该使用什么样的数组来执行此操作以及我应该如何实现它？这是我正在努力解决的部分。

这是我目前所拥有的:

import java.io.File;
import java.util.Scanner;

public class TextFile {
    public static void main(String[] args) throws Exception {
        Scanner input = new Scanner(new File("JobQueue.txt"));

        String jobName;
        int arrivalTime;
        int cpuTime;
        String pageFault;

        while (input.hasNext()) {
            jobName = input.next();
            arrivalTime = input.nextInt();
            cpuTime = input.nextInt();
            pageFault = input.next();

            System.out.printf("\n%s %d %d %s\n", jobName, arrivalTime, cpuTime, pageFault);
        }
    }
}

04/22 编辑:
异常:

java.util.InputMismatchException
    at java.util.Scanner.throwFor(Unknown Source)
    at java.util.Scanner.next(Unknown Source)
    at java.util.Scanner.nextInt(Unknown Source)
    at java.util.Scanner.nextInt(Unknown Source)
    at TextFile.main(TextFile.java:18)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at edu.rice.cs.drjava.model.compiler.JavacCompiler.runCommand(JavacCompiler.java:272)

这是我到目前为止编写的代码:

import java.io.File;
import java.util.ArrayList;
import java.util.Scanner;

public class TextFile {
    public static void main(String[] args) throws Exception {
        Scanner input = new Scanner(new File("JobQueue.txt"));
        ArrayList<DataObject> list = new ArrayList<DataObject>();

        while (input.hasNext()) {
            String jobName = input.next();
            int arrival = input.nextInt();
            input.nextLine();
            int cpuTime = input.nextInt();
            input.nextLine();
            String inturrupt = input.next();

            DataObject data = new DataObject(jobName, arrivalTime, cpuTime, pageFault);
            list.add(data);
        }
    }
}

和:

public class DataObject {
    private String jobName;
    private int arrivalTime;
    private int cpuTime;
    private String pageFault;

    public DataObject(String job, int arrival, int cpu, String interrupt) {
        jobName = job;
        arrivalTime = arrival;
        cpuTime = cpu;
        pageFault = interrupt;
    }

    public void setjobName(String job) {
        jobName = job;
    }

    public String getJobName() {
        return jobName;
    }

    public void setArrivalTime(int arrival) {
        arrivalTime = arrival;
    }

    public int getArrivalTime() {
        return arrivalTime;
    }

    public void setcpuTime(int cpu) {
        cpuTime = cpu;
    }

    public int getcpuTime() {
        return cpuTime;
    }

    public void setPageFault(String interrupt) {
        pageFault = interrupt;
    }

    public String getPageFault() {
        return pageFault;
    }

    public String toString() {
        return String.format("\n%s %d %d %s\n", getJobName(), getArrivalTime(), getcpuTime(), getPageFault());
    }
}

编辑 #2

import java.io.File;
import java.util.ArrayList;
import java.util.Scanner;
import java.io.IOException;

public class TextFile
 {
  public static void main(String[] args) throws IOException
  {
   Scanner input = new Scanner(new File("JobQueue.txt"));

   ArrayList<DataObject> list = new ArrayList<DataObject>(); 

   while(input.hasNext())
   {
    String jobName = input.next();
    int arrivalTime = input.nextInt();
    int cpuTime = input.nextInt();
    String pageFault = input.next();

    DataObject data = new DataObject(jobName, arrivalTime, cpuTime, pageFault);
    list.add(data);
   }
  }
 }

示例作业队列:

J1  0   90  "7,27,73,86"
J2  1   39  "12"
J3  2   195 "11,31,73,94,120,134,183"
J4  3   198 "7,25,57,83,112,138,190"
J5  4   103 "11,26,58,94"
J6  5   158 "15,39,63,79,120,144"
J7  6   168 "9,46,66,84,125,147"

Answer 1

为此，数据库 ORM 样式的方法是创建一个代表文件中每一行的类:

public class RecordObject {
    private String jobName;
    private int arrivalTime;
    private int cpuTime;
    private String pageFault;

    public RecordObject(String jobName, int arrivalTime, int cpuTime, String pageFault) {
        this.jobName = jobName;
        this.arrivalTime = arrivalTime;
        this.cpuTime = cpuTime;
        this.pageFault = pageFault;
    }

    // getters and setters
}

然后创建一个 ArrayList 来存储文件中任意数量的行:

ArrayList<RecordObject> list = new ArrayList<RecordObject>();

while(input.hasNext()) {           // <-- this is your original code
    jobName = input.next();
    arrivalTime = input.nextInt();
    cpuTime = input.nextInt();
    pageFault = input.next();

    RecordObject record = new RecordObject(jobName, arrivalTime, cpuTime, pageFault);
    list.add(record);
}

读取完整个文件后，您可以像这样遍历 ArrayList:

for (RecordObject record : list) {
    // compute throughput, average waiting time, etc...
}