第五周作业

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.StringTokenizer;

public class GraphReverse {

private static int vNum;
private static int eNum;

public static void main(String[] args) {
int[][] a = getData();
for (int i = 0; i < a.length; i++) {
System.out.print(i + ":");
for (int j = 0; j < a[i].length; j++) {
if(a[i][j] == 1)
System.out.print(j + ".");
}
System.out.println();
}
}

private static int[][] getData() {
int[][] matrix = null;

try {
BufferedReader reader = new BufferedReader(new FileReader(new File("src/tinyDG.txt")));
vNum = Integer.valueOf(reader.readLine().trim());
eNum = Integer.valueOf(reader.readLine().trim());
matrix = new int[vNum][vNum];

String temp = "";
while((temp = reader.readLine()) != null) {
StringTokenizer str = new StringTokenizer(temp);

int[] points = new int[2];
int index = 0;

while (str.hasMoreElements()) {
points[index] = Integer.valueOf(str.nextToken());
index++;
}

matrix[points[0]][points[1]] =  1;
}

} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (NumberFormatException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

return matrix
}
}