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社区首页 >问答首页 >在java中从文本文件中读取字符串和整数

在java中从文本文件中读取字符串和整数
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Stack Overflow用户
提问于 2013-10-24 09:50:39
回答 1查看 9.4K关注 0票数 1
代码语言:javascript
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/*This assignment is to create 2 parallel arrays – jobs& salaries
*Read file from “careers.txt” into arrays
*one line – job
*next line –salary
*Sort Salaries {from highest}
*then swap jobs if salary swapped
*Display output of careers and salaries from the highest on a formatted table.
* 
 */
package assignment7;
import java.util.*;//importing Scanner


public class Coordinator 
{


    public static void main(String[] args) throws Exception
    {// the main method creates the arrays and calls on each method to perform 
        //its work.
     String [] job = new String[20];//creating a string array having 20 spaces
     int[] salary = new int[20];//creating an integer array having 20 spaces
     int count;// number of spaces actually occupied in the array

     **count = readFile(job, salary);**// calling a method to read text into both
                                   //arrays and return the number of spaces 
                                   //occupied in the array

     sorter(job,salary,count);// calling on method to arrange file from highest
     //to lowest

     display(job, salary,count);// calling on method present the output


    }
    public static int readFile(String[] jobber, int[] salaro) throws Exception
    { // this method reads a text file and copies into arrays and also
        //returns the number of spaces occupied in the array
            int n = 0; //keeps track of number of times a line is fed into an 
            //array

            //set up a file class object linked up to the name of the file to 
            //be read
            java.io.File unread = new java.io.File("career.txt");

            // create a scanner instance to read the input from the file
            Scanner infile = new Scanner(unread);

            /*This while loop reads line of text into the arrays, it uses 
             * boolean
             * function hasNextLine() and the created scanner instance.
             */
            while (infile.hasNextLine() || infile.hasNextInt())
            {
                jobber[n] = infile.nextLine();
                **salaro[n] = infile.nextInt()**;
                n++;
            }//end while
            infile.close();//close scanner class
            return n;// return number of spaces filled

    }//end of readFile method


    public static void sorter(String[] jobestic, int[] salawe, int z) 
            throws Exception
    {// this method sorts the array from the highest paid job to the lowest.

      boolean swapped;// keeps track of when a swap takes place
      int i;// variable fo for loop
      int temp;// helps in swap
      String temp2;// helps in swap

      do
      {
          swapped = false;
          for (i= 0; i < z-1; i++)// a pass through the array
          {
              if (salawe[i+1] > salawe[i])
              // if the number before it is less they swap
              {
                  //swap starts
                  temp = salawe[i+1];
                  salawe[i+1] = salawe[i];
                  salawe[i] = temp;
                  //swaps the jobs too if the salary is swapped
                  temp2 = jobestic[i+1];
                  jobestic[i+1] = jobestic[i];
                  jobestic[i] = temp2;

                  swapped = true;
              }// end if


          }// end for

      } while (swapped);
   }// end sorter method

   public static void display(String[] jobo, int[] salary5 ,int k) throws Exception
   {

       //this method displays the output as a formatted table
       int i;
       System.out.printf("%-60s%15s%n", "Job", "Salary");





       for(i=0; i<k; i++)



           System.out.printf("%-60s%,15d%n", jobo[i], salary5[i]);

   }








}

伙计们,这段代码有什么问题?我绞尽脑汁一遍又一遍,想不出哪里出了问题……我运行了这段代码,但一直收到错误...错误总是指示粗体线条。我尝试读取的文本文件如下所示。我希望将职位存储在一个数组中,将相应的薪水存储在另一个数组中。就像并行阵列一样。请问代码有什么问题?我希望将薪水存储为整数,因为我在显示输出时已将其格式化为整数。谢谢。

代码语言:javascript
复制
Computer and Information Research Scientists
102190
Computer and Information Analysts
80460
Computer Systems Analysts
79680
Information Security Analysts
86170
Software Developers and Programmers
87100
Computer Programmers
74280
Software Developers(Applications)
90060
Software Developers(Systems Software)
99000
Web Developers
62500
Database and Systems Administrators and Network Architects
76880
Database Administrators
77080
Network and Computer Systems Administrators
72560
Computer Network Architects
91000
Computer Support Specialists
48900
Computer User Support Specialists
46420
Computer Network Support Specialists
59090

错误:

代码语言:javascript
复制
Exception in thread "main" java.util.InputMismatchException 
at java.util.Scanner.throwFor(Scanner.java:909) 
at java.util.Scanner.next(Scanner.java:1530) 
at java.util.Scanner.nextInt(Scanner.java:2160) 
at java.util.Scanner.nextInt(Scanner.java:2119) 
at assignment7.Coordinator.readFile(Coordinator.java:56)
at assignment7.Coordinator.main(Coordinator.java:25)
EN

回答 1

Stack Overflow用户

发布于 2013-10-24 11:35:18

这个问题,或者等同的问题,似乎每隔几天就会被问一次。

当您调用nextInt()时,您的扫描仪在该数字之后停止。然后,当您随后立即调用nextLine()时,实际上是在读取带有数字的行尾的换行符。你没有读下一行。因此,在循环的下一次迭代中,当扫描仪中的下一个非数字文本排成一行时,将调用nextInt()

在每次调用nextInt()之后添加一个对nextLine()的额外调用,只是为了读取额外的换行符。

票数 1
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页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接:

https://stackoverflow.com/questions/19555490

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