我已经读取了一个包含整数和字符串的文本文件,我需要使用所有四个信息来计算:
- 吞吐量
- 平均等待时间
- 平均周转时间
- 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,页面错误作为字符串读入,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完成这个任务,该如何实现呢?这是我遇到困难的部分。
以下是我目前的进展:
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);
}
}
}
编辑于04/22:
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)
这是我目前编写的代码:
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);
}
}
}
并且:
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);
}
}
}
样例作业队列:
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"
TextFile
代码中的含义是jobName
和arrival
在一行上,cpuTime
是第二行,而interrupt
则在第三行上。然而,您遇到的InputMismatchException
可能是由于试图将String
读取为int
引起的。请发布您的输入文件JobQueue.txt
,以便我们查看。 - Tim BiegeleisenArrayList
,要么可以查看使用Apache Commons CollectionUtils包。 - Tim Biegeleisen