java - 将信息读入多个数组

Question

该程序的目的是从文件中获取有关音乐 Collection 的信息并将其转换为三个数组。

>4
>141 Pure Heroine:Lorde
>171 Lights Out:Ingrid Michaelson
>270 Unorthodox Jukebox :Bruno Mars
>190 Head Or Heart:Christina Perri

在文件中，4 代表数组的长度，数字是一个数组，专辑标题是另一个数组，艺术家姓名是最终的数组。标题和艺术家姓名的数组由冒号分隔。虽然我可以为数字创建数组，但给我带来麻烦的是如何为名称和标题创建单独的数组。我知道我必须将其转换为字符串并使用冒号作为分隔符，但我不确定如何转换。

import java.util.*;
import java.io.*;

public class tunes {

public static void main(String[] args) throws FileNotFoundException {
    int size; //Determines the size of the arrays
    Scanner input = new Scanner(new File("music.txt"));
    size = input.nextInt();
    int[] time = new int[size];
    for (int i = 0; i < time.length; i++) { // Creates an array for the numbers
        time[i] = input.nextInt();
        input.nextLine();
    }
    String[] artist = new String[size]; 
    for (int i = 0; i <artist.length; i++) { 
        while (input.hasNextLine()){

        }
     } 
    System.out.println();
    System.out.println("TOTAL TIME\t\t\t\t" + calcTotalTime(time));
    System.out.println();
    System.out.println();
    System.out.println("LONGEST TRACK");
    System.out.println("-------------");
    System.out.println();
    System.out.println();
    System.out.println("SHORTEST TRACK");
    System.out.println("--------------");

}

public static void printTable(int[] time, String[] artist, String[] title) {
    System.out.println("TITLE\t\t\t" + "ARTIST\t\t\t    " + "TIME");
    System.out.println("-----\t\t\t" + "------\t\t\t    " + "----");
    for (int i = 0; i < time.length; i++) {
        System.out.println(title[i] + "\t" + artist[i] + "\t" + time[i]);
    }
}

public static int calcTotalTime(int[] time) {
    int sum = 0;
    for (int i = 0; i < time.length; i++) {
        sum = sum + time[i];
    }
    return sum;
}

public static int findLongest(int[] time) {
    int longest = 0;
    for (int i = 1; i < time.length; i++) {
        if (time[i] > time[longest]) {
            longest = i;
        }
    }
    return longest;
}

public static int findShortest(int[] time) {
    int shortest = 0;
    for (int i = 1; i < time.length; i++) {
        if (time[i] < time[shortest]) {
            shortest = i;
        }
    }
    return shortest;
}
}

输出的示例如下

>Pure Heroine       Lorde              141
>Lights Out         Ingrid Michaelson  171
>Unorthodox Jukebox Bruno Mars         270
>Head or Heart      Christina Perri    190

Answer 1

您可以在文本上使用 String.split(":") 将艺术家/标题 String 拆分为 String[]数组。

例如:

System.out.println(Arrays.toString("Head Or Heart:Christina Perri".split(":")));

输出

[Head Or Heart, Christina Perri]