Question

有人可以帮我把这些数据输入到ArrayList中的3个对象中（每个玩家一个）吗？

文本文件示例：

 Steve| Barkley| 258| 300
 Carl |Johnson |142
 Frank|Davidson

Java代码：

   //couldn't write the normal jfilechoose code above due to space
   File playerFile = new File(selectedFile.getAbsolutePath());

    Scanner in = new Scanner(playerFile);

     String[] playerData; //array to hold data

     while (in.hasNext()) {
         String data = in.nextLine();

         playertData = data.split("\\|");
         playerData = Arrays.copyOf(playerData,playerData.length+1);

        String firstName = playerData[0];
        String lastName  = playerData[1];

      double playererayear1 = Double.parseDouble(playerData[2]==null?"0":playerData[2]);
        double playererayear2 = Double.parseDouble(playerData[3]==null?"0":playerData[3]);

        double playererayear3 = Double.parseDouble(playerData[4] == null?"0":playerData[4]);

Answer 1

您可以创建一个单独的类来保存有关播放器的信息。

public class Player {
  private String firstName;
  private String lastName;
  private double playerEraYear1;
  private double playerEraYear2;
  private double playerEraYear3;

  public String getFirstName() {
    return firstName;
  }

  public void setFirstName(String firstName) {
    this.firstName = firstName;
  }

  public String getLastName() {
    return lastName;
  }

  public void setLastName(String lastName) {
    this.lastName = lastName;
  }

  public double getPlayerEraYear1() {
    return playerEraYear1;
  }

  public void setPlayerEraYear1(double playerEraYear1) {
    this.playerEraYear1 = playerEraYear1;
  }

  public double getPlayerEraYear2() {
    return playerEraYear2;
  }

  public void setPlayerEraYear2(double playerEraYear2) {
    this.playerEraYear2 = playerEraYear2;
  }

  public double getPlayerEraYear3() {
    return playerEraYear3;
  }

  public void setPlayerEraYear3(double playerEraYear3) {
    this.playerEraYear3 = playerEraYear3;
  }
}

现在你可以解析文件，为每个玩家创建一个Player对象并将它们添加到列表中

public void parseFile() {
    File playerFile = new File(selectedFile.getAbsolutePath());
    Scanner in = new Scanner(playerFile);
    List<Player> players = new ArrayList<>();
    while (in.hasNext()) {
      String data = in.nextLine();
      String[] playerData = data.split("\\|");

      Player p = new Player();
      p.setFirstName(playerData[0]);
      p.setLastName(playerData[1]);

      if (playerData.size >= 3) {
        double playererayear1 = Double.parseDouble(playerData[2] == null ? "0" : playerData[2]);
        p.setPlayerEraYear1(playererayear1);
      }

      if (playerData.size >= 4) {
        double playererayear2 = Double.parseDouble(playerData[3] == null ? "0" : playerData[3]);
        p.setPlayerEraYear2(playererayear2);
      }

      if (playerData.size >= 5) {
        double playererayear3 = Double.parseDouble(playerData[4] == null ? "0" : playerData[4]);
        p.setPlayerEraYear3(playererayear3);
      }

      players.add(p);
   }
}

Answer 2

package com.aegle.validator;

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

public class Test {
    public static void main(String[] args) throws FileNotFoundException {
        List<Player> playerList = new ArrayList<Player>();
        File playerFile = new File("");//Set your file path
        Scanner in = new Scanner(playerFile);

        while (in.hasNext()) {
            String[] data = in.nextLine().split("\\|");
            Player player = new Player(data[0], data[1]);
            player.setYears(Arrays.copyOfRange(data, 2, data.length));
            playerList.add(player);
        }

        System.out.println(playerList);//Just to test
    }
}

class Player {
    String firstName;
    String lastName;
    String[] years;

    public Player(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }

    public void setYears(String[] years) {
        this.years = years;
    }

    //Introduce getters as you need

    @Override
    public String toString() {
        return "Player{" +
                "firstName='" + firstName + '\'' +
                ", lastName='" + lastName + '\'' +
                ", years=" + Arrays.toString(years) +
                '}';
    }
}

读取文本文件（使用filechooser）并存储到ArrayList中（每行是arraylist中的新对象

2 个答案: