How to create an array of linked list reading data from a file

Hello,

I need to create a graph such that i read the number of vertices from a file and the edges too. Example "a b 5"--> means theres an edge from source 'a', destination 'b' and the edge weight is '5'. If i have some random number of vertices say 5, i need to create an adjacency list of the graph, using an array of linked lists. But i dont know how to use it!!

Could anybody help me with it?

Well, here i m trying store the vertices(4) in an array. and trying to read them. But i m getting an error of "Array Index out of Bounds Exception.
I know the error is in the line i have highlighted(red). And i have tried various methods. But not working.

Code:

---

public void readInput()
  {
          Scanner input = null;
        try
          {
          input = new Scanner(new FileInputStream("Test1.txt"));
                int vertex = input.nextInt();
                System.out.println("printing # of vertex "+vertex);
            String[] array = new String[vertex];
                System.out.println("array size "+ array.length);
               
                // reading vertex from file and storing them in the array
                for(int i=0;i<=array.length;i++)
                {
                  [COLOR="Red"]array[i]=input.nextLine();[/COLOR]
                  System.out.println("vertex "+array[i]);
                }

---

the error that i get is

Code:

---

returned from absgraph
printing # of vertex 4
array size 4
vertex
vertex a
vertex b
vertex c
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4
        at AbsGraph.readInput(AbsGraph.java:80)
        at DriverProgram.main(DriverProgram.java:12)

 ----jGRASP wedge2: exit code for process is 1.

---

what fuction should i use?