错误：在我创建的类中读取文本文件时出现问题

Question

当我运行我的程序 (BaseballStatsClient) 时，我收到错误：找不到团队名称、最大值和最小值的符号

更新：

我现在在读取文本文件时遇到问题，当我运行程序时，团队名称的输出值为 tars.txt，最大值和最小值为 0.0。我认为在第一个代码中我没有正确读取文本文件

文本文件：

Tars 
0.592
0.427
0.194
0.445
0.127
0.483
0.352
0.190
0.335
0.207
0.116
0.387
0.243
0.225
0.401
0.382
0.556
0.319
0.475
0.279  

这是我创建的类文件，我认为它读取文本文件的方式存在问题：

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

public class BaseballStats {

  private String fileName;
  private String teamName;
  private double [] battingAverage;


  public BaseballStats ( String fileName ) {
    this.fileName = fileName;
    boolean firstLine = true;
    Scanner input = new Scanner(fileName);
    while (input.hasNextLine()) {
      String line = input.nextLine();
      if (firstLine) {
        setTeamName (line);
        firstLine = false;
        continue;
      }
      int i=0;
      while(input.hasNext()) {
        battingAverage[i] = input.nextDouble();
        i++;      
      }
    }
  }

  public String getTeamName( ) {
    return teamName;
  }

  public void setTeamName( String newTeamName ) {
    teamName=newTeamName;
  }

  public double findMaxAverage( ) {
    double max =battingAverage[0];
    for ( int i =1; i < battingAverage.length; i++) {
      if(battingAverage[i] >max)
        max= battingAverage[i];
    }
    return max;
  }
  public double findMinAverage( ) {
    double min =battingAverage[0];
    for ( int i =1; i < battingAverage.length; i++) {
      if(battingAverage[i] < min)
        min= battingAverage[i];
    }
    return min;
  }    
  public double spread( ) {
    //returns the difference between the highest and lowest batting averages
  }
  public int goodPlayers( ) {     
    //returns the number of players with an average higher than .300
  }
  public String toString( ) {  
   // returns a String containing the team name followed by all the batting averages  formatted to three decimal places.
  }
}

这是我正在运行的程序：

import java.util.Scanner;

public class BaseballStatsClient {  
  public static void main( String [] args ) {
    Scanner scan = new Scanner (System.in );
    System.out.println("What is the name of the file you would like to find the statistics of?");
    String fileName = scan.next( );

    BaseballStats newTeam = new BaseballStats(fileName);
    System.out.println("The " + newTeam.getTeamName() + " statistics are:");
    System.out.println("Highest Batting Average: " + newTeam.findMaxAverage( ));
    System.out.println("Lowest Batting Average: " + newTeam.findMinAverage( ));
  }
}

Answer 1

newTeam.getTeamName( );
System.out.println("The " + teamName + " statistics are:");
newTeam.findMaxAverage( );
System.out.println("Highest Batting Average: " + max);
newTeam.findMinAverage( );
System.out.println("Lowest Batting Average: " +min);

您尚未定义定义它们并尝试打印它们。

用返回值定义变量。

喜欢

   String teamName =newTeam.getTeamName( );
   System.out.println("The " + teamName + " statistics are:");

剩下的 min 和 max 变量也是如此。

而且你可以直接做

 System.out.println("The " + newTeam.getTeamName() + " statistics are:");

注意newTeam，可能是null。

Answer 2

您尚未定义返回值。

你可以这样做：

String returnValue =newTeam.getTeamName( );
System.out.println("The value is " + returnValue);