reading input from text file java

This is my input file:

4 4 3 2   //edges//vertex//must visit node//case
1 2 4// this are the graph node and its a directed weighted grap//
1 3 20
2 3 4 
3 4 4
1 4// source 1 to 4//
2 4 // source  2 to 4//

how to read the input file ?
1.for the first line user give the vertices,edges,a must visit node,case
2.
3.those line are representing graph vertices ,edges and weight between them
4.
5.
using dijkstra algo from source 1 and destination 4
for last two line
6.

7.
i upload the new edited code also facing problem can you please go through it

import java.util.*;
import java.io.*;
public class Adjacency_matrix {
/**
* @param args the command line arguments
*/
static int a[][];
private static boolean[] checks;
public static void main(String[] args) {
// TODO code application logic here
try {
FileReader f = new FileReader("E:\\dijkstra.txt");
BufferedReader b = new BufferedReader(f);
//    int[]v=new int[4];
String[] v = b.readLine().split(" ");
for (int i = 0; i < v.length; i++) {
int ver = Integer.parseInt(v[0]);
int edg = Integer.parseInt(v[1]);
int x = Integer.parseInt(v[2]);
int test = Integer.parseInt(v[3]);
a = new int[ver][ver];
}
String[] v1 = b.readLine().split(" ");
for (int i = 0; i < 4; i++) {
int ver1 = Integer.parseInt(v1[0]);
int edg1 = Integer.parseInt(v1[1]);
int w = Integer.parseInt(v1[2]);
a[ver1][edg1] = w;
}
String s;
while ((s = b.readLine()) != null) {
StringTokenizer st = new StringTokenizer(s, " ");
int src = Integer.parseInt(st.nextToken());
int d = Integer.parseInt(st.nextToken());
}
System.out.println("Adjacency Matrix");
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
System.out.print(a[i][j]);
}
System.out.println();
}
} catch (Exception e) {
System.out.println(e);
}
}
}

1. You're parsing 4 elements on the first line when there are only 3 (try changing the catch block to e.printStackTrace() to see where the program crashes).
2. You're not using e (the one you define, not the exception) or c in this code. That may be because you haven't provided the entire thing.
3. Commenting out the assignment to c, your array assignment fails because you are assigning indices based on token1 and token2 assuming a 1-based array instead of a 0-based array, thus it will throw ArrayIndexOutOfBoundsException for the input line 3 4 4
4. It then fails on the next line because there is no cost associated with 1 4, yet your while condition will continue to add graph elements until there is no more input.