java将方法拆分为数组

问题描述

我有如下数据：

3.3 John
3.9 Jim
3.5 Kathy
3.2 Steve
2.4 Stacy
2.8 Faith

代码：

File StudentGrade = new File("data.txt");
    Scanner reader = new Scanner(StudentGrade);
    int size = reader.nextInt();
    //debug: System.out.println(size);

    String[] gradeArr = new String[size];// array created for grades
    //debug: System.out.println(gradeArr);
    String[] nameArr = new String[size];//array created for name
    String[] temp = new String[100];// array created for temporary array
    int index = 0;//index indicator

    while (reader.hasNextLine()) {
        String s = reader.nextLine();
        //System.out.println(s);
        temp = s.split("\\s+");
        gradeArr[index] = temp[0];
        nameArr[index] = temp[1];
        System.out.println("grades= "+ gradeArr[index]+ " name = "+ nameArr);
        index++;
    }

必须将其拆分为2个数组，一个用于数字，另一个用于数字是为了名字。
我可以将数字转换为 temp [] ，但是我不知道如何将名称转换为另一个数组。请教我。

It has to be split to 2 arrays, one is for the numbers, another is for names.I can get the numbers to temp[], but I don't know how to convert names to another array. Please teach me.

推荐答案

调用 split（ \\s +），结果数组如下所示：

When you call split("\\s+"), the result array would look like this:

gradeArr[0] = 3.3;
gradeArr[1] = John;

因此，如果您调用 gradeArr [1]

您需要在<$ c之后调用 reader.nextLine（）; $ c> reader.nextInt（）; 。您需要在 int 之后读取回车符，这样您才能在.text文件的下一行。

You need to call reader.nextLine(); after your reader.nextInt();. You need to read the enter character after the int so you would be on the next line of the .text file.

以下代码有效：

File StudentGrade = new File("E:/workspace/Test/src/main/java/data.txt");
        Scanner reader = new Scanner(StudentGrade);
        int size = reader.nextInt();
        // debug: System.out.println(size);
        reader.nextLine();
    String[] gradeArr = new String[size];// array created for grades
    // debug: System.out.println(gradeArr);
    String[] nameArr = new String[size];// array created for name
    String[] temp = new String[100];// array created for temporary array
    int index = 0;// index indicator

    while (reader.hasNextLine()) {
        String s = reader.nextLine();
        // System.out.println(s);
        temp = s.split("\\s+");
        gradeArr[index] = temp[0];
        nameArr[index] = temp[1];
        System.out.println("grades= " + gradeArr[index] + " name = " + nameArr[index]);
        index++;
    }

这是结果：

grades= 3.3 name = John
grades= 3.9 name = Jim
grades= 3.5 name = Kathy
grades= 3.2 name = Steve
grades= 2.4 name = Stacy
grades= 2.8 name = Faith

数据.text：

6
3.3 John
3.9 Jim
3.5 Kathy
3.2 Steve
2.4 Stacy
2.8 Faith

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