从文件读取,加载数组

时间:2015-12-01 00:43:49

标签: java multidimensional-array bankers-algorithm

我试图在Java中实现Banker的算法,但是我在加载数组时遇到了问题。以下是我使用

的代码
public static void main(String[] args) throws FileNotFoundException {
    String filename = null;
    int need[][];
    int allocate[][];
    int max[][];
    int available[][];
    int n = 0;
    int m = 0;
    int lineCount = 0;
    Scanner in = new Scanner(System.in);

    System.out.println("Enter the file name.");
    filename = in.nextLine();

    File textFile = new File(filename);
    Scanner input = new Scanner(textFile);

    max = new int[n][m];
    allocate = new int[n][m];
    need = new int[n][m];
    available = new int[1][m];

    n = input.nextInt();
    m = input.nextInt();
    System.out.print("Number of Processes: " + n);
    System.out.print("\nNumber of Processes: " + m);

    max = new int[n][m];
    allocate = new int[n][m];
    need = new int[n][m];
    available = new int[1][m];

    String line = input.nextLine();

    while (line != null && lineCount < n) {

        String[] temp = line.split(" ");
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                allocate[i][j] = Integer.parseInt(line);
                System.out.println("here");
            }
            line = input.nextLine();
            lineCount++;
        }
    }
}

我的示例文件包含此数据。

5

4

0 0 1 2 1 0 0 0 1 3 5 4 0 6 3 2 0 0 1 4

0 0 1 2 1 7 5 0 2 3 5 6 0 6 5 2 0 6 5 6

1 5 2 0

1:0 4 2 0

因此,在尝试执行此操作时,我遇到了许多不同的错误。现在我得到一个NumberFormatException:对于输入字符串&#34;&#34;错误。非常感谢任何帮助。

1 个答案:

答案 0 :(得分:0)

你有一堆非常小的数组,你永远不会增加它们的大小:

int n = 0;
int m = 0;
...
max = new int[n][m];       // 0x0 array, unused
allocate = new int[n][m];  // 0x0 array, likely the culprit
need = new int[n][m];      // 0x0 array, unused
available = new int[1][m]; // 1x0 array, unused

在这些数组中,仅使用allocate,稍后您将在for循环中使用它:

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            // OutOfBounds is probably here:
            allocate[i][j] = Integer.parseInt(line);
            System.out.println("here");
        }
        line = input.nextLine();
        lineCount++;
    }

此外,您正在运行Integer.parseInt(line),它正在尝试解析整行。您应该一次解析一个令牌Integer.parseInt(temp[someindex])