Java, ArrayList

import org.graphstream.graph.Edge;
import org.graphstream.graph.Node;
import org.graphstream.graph.implementations.SingleGraph;

import java.io.FileWriter;
import java.io.IOException;

import java.util.Random;

public class FileManage 
{
    private final SingleGraph myGraph;
    
    private final int[][] myTab;
    
    public FileManage(int dim,String fileName)
    {
        myTab = createMatrix(dim,0,9);
        saveMatrix(dim,myTab,fileName);
        myGraph = createGraph(dim,myTab,"My Graph");
        myGraph.display(false);
    }
        
    public static int [][] createMatrix(int dim, int minValue, int maxValue)
    {
        int[][] myTab= new int[dim][dim];
         
        Random rd = new Random();
        
        for (int i=0; i<dim; i++)
        for (int j=0; j<dim; j++)
            myTab[i][j] = rd.nextInt(maxValue+1-minValue)+minValue;

        return myTab;
    }
         
    public static boolean saveMatrix(int dim, int[][] mat, String fileName)
    {
        try
        {
            String endl = System.getProperty("line.separator");
            
            FileWriter filew = new FileWriter(fileName);

            for(int i=0; i<dim; i++)
            {
                for(int j=0; j<dim; j++)
                    filew.write(mat[i][j]+"\t");
                
                filew.write(endl);
            }
            
            filew.close();
            
            return true;
        }
        catch (IOException e)
        {
            System.err.println(e);
            return false;
        }
    }
    
    private static String ID(int i,int j)
    {
        return "("+i+","+j+")";
    }
    
    private static String ID(int i1,int j1,int i2,int j2)
    {
        return ID(i1,j1)+"-"+ID(i2,j2);
    }
    
    public static SingleGraph createGraph(int dim, int[][] mat, String graphName)
    {
        SingleGraph g = new SingleGraph(graphName);
        
        // création des noeuds
        //--------------------
        
        for (int i=0; i<dim; i++)
        for (int j=0; j<dim; j++)
        {
            String id = ID(i,j);
            Node n = g.addNode(id);
            
            n.addAttribute("xyz",j,-i,0); // la position du noeud dans l'espace
            n.addAttribute("val",mat[i][j]); // le poids du noeud
            n.addAttribute("label",id+"["+mat[i][j]+"]"); // l'étiquette du noeud pour l'affichage
            
            // un noeud normal en noir
            n.setAttribute("ui.style","size:8px; fill-color:black; text-color:black; text-size:12px;");
        }

        // le noeud de départ en vert
        g.getNode(ID(0,0)).setAttribute("ui.style","size:10px; fill-color:green; text-color:green; text-size:12px;");
        
        // le noeud d'arrivée en rouge
        g.getNode(ID(dim-1,dim-1)).setAttribute("ui.style","size:10px; fill-color:red; text-color:red; text-size:12px;");
        
        // création des arêtes
        //--------------------
        
        for (int i=0; i<dim; i++)
        for (int j=0; j<dim; j++)
        {
            // arete horizontale
            if (j<dim-1)
            {                
                Edge e = g.addEdge(ID(i,j,i,j+1),ID(i,j),ID(i,j+1));
                e.setAttribute("ui.style","size:1px; fill-color:black;");
            }
            
            // arete verticale
            if (i<dim-1)
            {
                Edge e = g.addEdge(ID(i,j,i+1,j),ID(i,j),ID(i+1,j));
                e.setAttribute("ui.style","size:1px; fill-color:black;");
            }
        }
        
        return g;
    }
    
    public static void main(String...args)
    {
        new FileManage(5,"C:\\fichier.txt");
    }
}