创建构造函数以读取txt文件 [英] Creating a constructor to read a txt file

问题描述

我正在创建一个程序，将生成一个棒球队的统计

I am creating a program that will produces the statistics of a baseball team

我试图创建一个构造函数读取文件到teamName实例变量和battingAverages数组。

i am trying to create a constructor to read the file into the teamName instance variable and the battingAverages array.

txt文件包含团队的一个单词名称，后面是20个击球平均值。

the txt file contains the one word name of the team followed by 20 batting averages.

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

"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 "

我很难找到如何去做这个，它开始了？

I am struggling to find how to go about this and get it started?

推荐答案

我运行这个，这可能接近你想要的。

I ran this and this might be close to what you want. Instead of making a confusing constructor, make a private method that the constructor will call to read in the file into the array.

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



public class Baseball {

    private File textFile;
    private Scanner input;
    private String teamName;

    //this will only work if you know there will be 20 entries everytime
    //otherwise I recommend loading the data into an ArrayList
    private double []battingAvgs = new double[20];

    public Baseball(String file){
        textFile = new File(file);
        readInFile(textFile);

    }

    //private method that reads in the file into an array 
    private void readInFile(File textFile){
        try {
            input = new Scanner(textFile);

            //read first string into variable teamName
            teamName = input.next();

            int i=0;
            //iterate through rest of file adding it to an ArrayList
            while(input.hasNext()){
                battingAvgs[i] = input.nextDouble();
                i++;
            }

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

    //print out array
    public void printArray(){
        for(Double a: battingAvgs){
            System.out.println(a);
        }
    }

}

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