Page Rank Power Iteration

import java.util.Scanner;
import java.lang.Math;


class PowerIteration{

    public static void main(String args[]){
        Scanner scanner = new Scanner(System.in);
        int N,M;
        System.out.println("Enter Number of Nodes and Edges : ");
        N = scanner.nextInt();
        M = scanner.nextInt();

        PageRank pg = new PageRank(N,M);
        pg.input();

        //-- iterate 50 times or until no difference between two iteration.
        for(int i = 0; i < 50; i++){
            pg.iteration();
            System.out.println(i+" Iteration Done");
            if(pg.stop()){
                System.out.println("NO Differece between Iteration");
                break;
            }
        }
        pg.showPageRank();

    }

}

class PageRank{
    int Node=100,Edge=100;
    double epsilone = 0.0000000001;

    double[][] matrix = new double[Node][Edge];
    double[]  rank = new double[Node];
    double[]  old_rank = new double[Node];

    Scanner scanner = new Scanner(System.in);

    PageRank(int N,int M){
        Node = N;
        Edge = M;


        for(int i =0; i < Node; i++){
            rank[i] = 1/(double)Node;
            //old_rank[i] = 1/ Node;
        }
    }

    void input(){
        System.out.println("Input Value of Matrix\n");

        for(int i = 0 ; i < Node; i++){
            for(int j =0; j < Node; j++){
                System.out.print("Enter value for matrix["+i+"]["+j+"] : ");
                matrix[i][j] = scanner.nextDouble();
            }
        }

    }

    void show(){
        System.out.println("\nMatrix is :\n");
        for(int i = 0; i < Node; i++){
            for(int j = 0; j < Node; j++){
                System.out.print(matrix[i][j]+"  ");
            }
            System.out.println();
        }
    }

    boolean stop(){
        for(int i = 0; i < Node; i++){
            if(  Math.abs( rank[i] - old_rank[i]) < epsilone  )
                continue;
            else
                return false;
            }
        return true;
    }

    void iteration(){

        double[] product = new double[Node];
        for(int i = 0; i < Node; i++){
            old_rank[i] = rank[i];
            product[i] = 0;
            //System.out.print(rank[i]);
        }

        //--multiply


        for(int i =0; i < Node; i++){
            for(int j = 0; j < Node; j++){
                product[i] += rank[j] * matrix[i][j];
            }
        }
        //System.out.print("Now Rank is : ");
        for(int i =0 ; i < Node; i++){
            rank[i] = product[i];
            //System.out.print(product[i]+" ");
        }
    }

    void showPageRank(){
        System.out.println("Page Rank is:\n");
        for(int i = 0; i < Node; i++){
            System.out.println("["+rank[i]+"]");
        }
        }

}