java - 将字符串数组转换为二维数组

Question

我有一个像这样的字符串数组

3
1 5 5
2 -2 -3
15 -100 20

如何将其转换为二维数组

1 5 5
2 -2 -3
15 -100 20

3是2d的大小

public static class convert(String[] lines){
    int n = Integer.parseInt(lines[0]);             
    int[][] matrix = new int[n][n];
    for (int j = 1; j < n; j++) {
        String[] currentLine = lines[j].split(" ");
        for (int i = 0; i < currentLine.length; i++) {
            matrix[j][i] = Integer.parseInt(currentLine[i]);
        }
    }
}

Answer 1

罪恶，

您有几个 Off-by-one errors .

试试这个:

int n = Integer.parseInt(lines[0]); 
int[][] matrix = new int[n][n];
for (int j = 1; j <= n; j++) {
                String[] currentLine = lines[j].split(" ");
                for (int i = 0; i < currentLine.length; i++) {
                    matrix[j-1][i] = Integer.parseInt(currentLine[i]);
                }
}

如果您有任何疑问，请告诉我!