为什么我无法从主函数访问我的 getter 和 setter?

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英文:

Why cant I acess my getters and setters from the main?

问题

以下是您要翻译的内容:

我正在尝试解决一个问题,该问题从文件中收集信息并将其存储在ArrayList中。我似乎无法弄清楚为什么无法访问我创建的类中的方法。在文件的每一行中,您都有两个团队的名称以及每场比赛的得分。我需要询问用户他想要我查找哪个团队,如果我能找到该名称,就呈现团队所玩的总比赛次数。我还需要比较比分并打印赢得的总比赛次数和输掉的总比赛次数。我的想法是创建一个方法来将字符串拆分为多个部分,并将这些信息作为属性添加到ArrayList中的新对象中。

以下是类Game:

public class Game {
    String homeTeam;
    String visitorTeam;
    int homePoints;
    int visitorPoints;

    public Game(String home, String visitor, int hPoints, int vPoints){
        this.homeTeam = home;
        this.visitorTeam = visitor;
        this.homePoints = hPoints;
        this.visitorPoints = vPoints;
    }

    public String getHomeTeam() {
        return homeTeam;
    }

    public String getVisitorTeam() {
        return visitorTeam;
    }

    public int getHomePoints() {
        return homePoints;
    }

    public int getVisitorPoints() {
        return visitorPoints;
    }

    @Override
    public String toString(){
        return homeTeam + visitorTeam + homePoints + visitorPoints;
    }
}

以下是目前为止的主要内容:

import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Scanner;

public class SportStatistics {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        System.out.println("File:");
        String file = scan.nextLine();

        System.out.println("Team:");
        String team = scan.nextLine();

        ArrayList<Game> gameInfo = readRecordsFromFile(file);
        System.out.println(gameInfo);

        gameInfo.getHomeTeam();

    }

    public static ArrayList<Game> readRecordsFromFile(String file) {
        ArrayList<Game> information = new ArrayList<>();
        try (Scanner read = new Scanner(Paths.get(file))) {
            while (read.hasNextLine()) {
                String info = read.nextLine();

                if (info.isEmpty()) {
                    continue;
                }

                String[] parts = info.split(",");
                String homeTeam = parts[0];
                String visitorTeam = parts[1];
                int homePoints = Integer.valueOf(parts[2]);
                int visitorPoints = Integer.valueOf(parts[3]);

                information.add(new Game(homeTeam, visitorTeam, homePoints, visitorPoints));
            }

        } catch (Exception e) {

        }
        return information;

    }

}
英文:

I am trying to solve a problem that collects information from a file and stores it in an ArrayList. I cant seem to figure out why I cant access the methods from the class I created. In each line of the file you have the name of two teams and its scores in each game. I need to ask the user which team he wants me to look for and if I can find the name, present the totalGames the team played. I would also need to compare the scores and print total games won and total games lost. My idea was creating a method to split the string in multiple parts and add those info as attributes to a new object in an ArrayList.

Here is the class Games:

    public class Game {
String homeTeam;
String visitorTeam;
int homePoints;
int visitorPoints;
public Game(String home, String visitor,int hPoints,int vPoints){
this.homeTeam = home;
this.visitorTeam = visitor;
this.homePoints = hPoints;
this.visitorPoints = vPoints;
}
public String getHomeTeam() {
return homeTeam;
}
public String getVisitorTeam() {
return visitorTeam;
}
public int getHomePoints() {
return homePoints;
}
public int getVisitorPoints() {
return visitorPoints;
}
@Override
public String toString(){
return homeTeam + visitorTeam + homePoints + visitorPoints;
}
}

and here is how my main is looking like so far:

import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Scanner;
public class SportStatistics {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
System.out.println(&quot;File:&quot;);
String file = scan.nextLine();
System.out.println(&quot;Team:&quot;);
String team = scan.nextLine();
ArrayList&lt;Game&gt; gameInfo = readRecordsFromFile(file);
System.out.println(gameInfo);
gameInfo.getHomeTeam();
}
public static ArrayList&lt;Game&gt; readRecordsFromFile(String file) {
ArrayList&lt;Game&gt; information = new ArrayList&lt;&gt;();
try ( Scanner read = new Scanner(Paths.get(file))) {
while (read.hasNextLine()) {
String info = read.nextLine();
if (info.isEmpty()) {
continue;
}
String[] parts = info.split(&quot;,&quot;);
String homeTeam = parts[0];
String visitorTeam = parts[1];
int homePoints = Integer.valueOf(parts[2]);
int visitorPoints = Integer.valueOf(parts[3]);
information.add(new Game(homeTeam, visitorTeam, homePoints, visitorPoints));
}
} catch (Exception e) {
}
return information;
}
}

答案1

得分: 0

gameInfo在这里是ArrayList类型。您将需要首先迭代该列表,然后才能调用getter和setter方法。

gameInfo.forEach(ob -> System.out.println(ob.getHomeTeam()));
英文:

gameInfo is of type ArrayList here. You will have to iterate the list first the you will be able to call getters and setters.

gameInfo.forEach(ob-&gt;System.out.println(ob.getHomeTeam()));

答案2

得分: 0

for(Game g : gameInfo){
   System.out.println(g.getHomeTeam());
}

This should do it a simple for each loop to grab each game out of the list (g) and prints the home team for each game.

You can also do

for(int i = 0; i < gameInfo.size(); i++){
    System.out.println(g.getHomeTeam());
}
英文:
for(Game g : gameInfo){
System.out.println(g.getHomeTeam());
}

This should do it a simple for each loop to grab each game out of the list (g) and prints the home team for each game.

You can also do

for(int i = 0; i &lt; gameInfo.size(); i++){
System.out.println(g.getHomeTeam());
}

答案3

得分: 0

gameInfo是一个Game类的数组列表。您需要遍历该列表以获取对象。只有使用这些对象,才能访问其getter和setter方法。
您可以使用for循环或for-each循环来实现此目的。

英文:

gameInfo is a arrayList of class Game. You will have to iterate through the list to get the object. The getters and setters can only be accessed with these objects.
You can use a for loop or a for-each loop for this purpose.

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  • 本文由 发表于 2020年10月17日 02:53:19
  • 转载请务必保留本文链接:https://go.coder-hub.com/64394868.html
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