Java String数组不起作用。代码包括在内

Question

public static void main(String[] args) {
    int LENGTH=0;
    int currentSize=0;
    String[] albumArray = new String[LENGTH];

    Scanner sc = new Scanner(System.in);

    System.out.println("How many tracks are in your album?");
    LENGTH=sc.nextInt();
    System.out.println("Thanks.");
    System.out.println("Please enter " + LENGTH + " track names to add to the album: ");

    //Prompts user to enter values until the array is filled. Repeats until filled.
    while (currentSize < LENGTH){
        System.out.print("Enter track name "+(currentSize+1)+":\t");
        albumArray[currentSize] = sc.nextLine();
        currentSize++;
    }

    for (int i =0; i<LENGTH;i++){
        System.out.println(albumArray[i]);
        System.out.println();
    }

}

}

好的，基本上这个程序允许用户创建一个专辑。用户设置数组中的轨道数（LENGTH），然后为数组中的每个索引分配一个String值。

我在第18行下收到错误

"albumArray[currentSize] = sc.nextLine();"

有谁知道我在这里做错了什么？提前谢谢。

Answer 1

int LENGTH=0;
int currentSize=0;
String[] albumArray = new String[LENGTH]; //can't do this yet, LENGTH is still 0

Scanner sc = new Scanner(System.in);

System.out.println("How many tracks are in your album?");
LENGTH=sc.nextInt();

您需要在知道长度后创建数组。

int LENGTH=0;
int currentSize=0;

Scanner sc = new Scanner(System.in);

System.out.println("How many tracks are in your album?");
LENGTH=sc.nextInt();
String[] albumArray = new String[LENGTH];

Answer 2

您正在将albumArray初始化为零长度。请在收到用户输入后进行初始化。