如何只读取文件中的数据（忽略字符串）？

In java, how can you read only data from a file, and ignore the strings preceding it? Please guys, I did a lot of research but I couldn't seem to find it.

在java中,如何只读取文件中的数据,并忽略它前面的字符串?伙计们,我做了很多研究,但我似乎无法找到它。

Here is a sample textfile:

这是一个示例文本文件:

number of courses:3
course numbers:219 214 114
arrival Probabilities:0.4 0.6 0.8
min time:2
max time: 4
num cups:1
simulation time:50
number of tas:2

Now as you guys can see, I just want to read the numbers.

现在,你们可以看到,我只想阅读数字。

My current code is the following, but I run into an InputMismatchException due to obvious reasons (It reads string first instead of integer):

我当前的代码如下,但由于显而易见的原因我遇到了InputMismatchException(它首先读取字符串而不是整数):

//Read file
        while(input.hasNext()){
            //Read Number of Courses

            numCourses = input.nextInt();
            courseNumbers = new int[numCourses]; //Initialize the size of courseNumbers array.
            arrivalProbability = new double[numCourses]; //Initialize the size arrivalProbability array.

            //Read the CourseNumbers, numCourses times.
            for(int i = 0; i < numCourses; i++){
                courseNumbers[i] = input.nextInt();

            }

            //Read the arrivalProbability, numCourses times.
            for(int i = 0; i < numCourses; i++){
                arrivalProbability[i] = input.nextDouble();

            }

            //Read minTime
            minTime = input.nextInt();

            //Read maxTime
            maxTime = input.nextInt();

            //Read number of Coffee cups
            numCups = input.nextInt();

            //Read simulation time
            officeHrTime = input.nextInt();

            //Read the number of TAs
            numTAs = input.nextInt();
        }

Thanks for your help in advance!

感谢您的帮助!

1 个解决方案

#1

I would do it like this:

我会这样做:

read a line

读一条线

parse the line, determine which part is the label and which part is the data

解析该行,确定哪个部分是标签,哪个部分是数据

use the label to determine how to store the data

使用标签来确定如何存储数据

Don't use nextInt, use nextLine. You would need to do a lot more error checking than I have included here, but I would do it something like this:

不要使用nextInt,请使用nextLine。您需要进行比我在此处包含的更多错误检查,但我会这样做:

int numCourses;
int[] courseNumbers; // I would use a list here, but sticking with your data types for clarity.

while(input.hasNextLine()) {
    String line = input.nextLine();
    String[] lineParts = line.split(":");
    String label = lineParts[0];
    String value = lineParts[1];

    if(label.equals("number of courses")) {
        numCourses = Integer.parseInt(value);
    } else if(label.equals("course numbers")) {
        String[] courseNumberStr = value.split(" ");
        courseNumbers = new int[numCourses]; // you probably want to make sure numCourses was set and courseNumStr has the correct number of elements
        for(int i = 0; i < courseNumberStr.length; i++) {
            courseNumbers[i] = Integer.parseInt(courseNumberStr[i]);
        }
    } else if( /* handle the rest of the inputs */) {
        // etc
    }

#1