过去5-8个小时,我一直在努力解决这项任务,但无济于事。 我被分配阅读一个txt文件,该文件包含约50行的“ carModel,carColor”,并创建一个[8] x [8] 2d数组,该数组的每个汽车模型都位于矩阵顶部,每个汽车颜色都位于矩阵顶部。二维矩阵的左侧,均已排序。然后,每次选择某些“ carModel,carColor”时,它们各自的carModel和carColor都会更新1。就像汽车库存表一样。
我已经从两个单独的ArrayList创建了一个String的2D数组,并填充了应该为所有零的空空间,即字符串“ 0”。但是现在我在读取文件时遇到了麻烦,因此每次选择特定的“ carModel,carColor”时,它都会更新原始的[8] x [8]字符串数组。我在哪里错了,我该怎么做才能使此操作更容易/更有条理?
这是我当前整个作业的代码:
public class Cars1 {
public static void main (String [] args) throws Exception
{
String [][] cars = new String [8][8];
ArrayList <String> colors = new ArrayList<>();
colors.add("BLUE ");
colors.add("BLACK ");
colors.add("BROWN ");
colors.add("GREEN ");
colors.add("RED ");
colors.add("SILVER");
colors.add("WHITE ");
Collections.sort(colors);
ArrayList <String> models = new ArrayList<>();
models.add("Escape ");
models.add("Explorer");
models.add("F150 ");
models.add("F250 ");
models.add("Flex ");
models.add("Mustang ");
models.add("Taurus ");
Collections.sort(models);
cars [0][0] = "_____ ";
for (int a = 1; a < cars.length; a++)
{
cars[0][a] = (models.get(a-1)) + " ";
}
for (int b = 1; b < cars.length; b++)
{
cars[b][0] = (colors.get(b-1)) + " ";
}
for (int fir = 1; fir < cars.length; fir++)
{
for (int sec = 1; sec < cars[1].length; sec++)
{
if (cars[fir][sec] == null)
{
cars[fir][sec] = "0 ";
}
}
}
for (int first = 0; first < cars.length; first++)
{
for (int second = 0; second < cars[first].length; second++)
{
System.out.print(cars[first][second]);
}
System.out.println();
}
File file = new File ("/Users/blakells/NetBeansProjects/Examples/cars.txt");
Scanner sc = new Scanner(file);
String ab = sc.nextLine();
int[][]count = new int [8][8];
while (ab != null)
{
String model = ab.substring(0,ab.indexOf(",")).toLowerCase();
// I get the exception here
String color = ab.substring(ab.indexOf((",")+1)).toLowerCase();
int row = colors.indexOf(color.toLowerCase());
int col = models.indexOf(model.toLowerCase());
count[row][col]++;
}
}
}