public class HopfieldNetwork0{
      private final int D = 5; //dimension
      private final int patterns[][] = {{1,1,1,1,-1},{-1,-1,-1,1,1}};
      private int matrix[][];  
      private int input[];
      private int output[];
      private int X1[] = {1,1,1,1,1};
      private int X2[] = {-1,-1,-1,-1,-1};

      public HopfieldNetwork0(){
         matrix = new int[D][D];
         input = new int[D];
         output = new int[D];
         for(int j=0; j<D; j++)
            for(int k=0; k<D; k++){
               if(j==k)
                  matrix[j][k] = 0;
               else
                  matrix[j][k] = patterns[0][j] * patterns[0][k] + patterns[1][j] * patterns[1][k];
            }
         findThePattern(X1);
         findThePattern(X2);
      }  
 
      public void findThePattern(int[] X){  
         for(int i=0; i<D; i++){
            input[i]=X[i];
            output[i]=0;
        }
         
         boolean flag=true;
         int iteration=0;
         do{
           flag=true;   
           
            for(int m=0; m<D; m++)
               for(int i=0; i<D; i++)
                  output[m] += matrix[m][i] * input[i];
         
            for(int m=0; m<D; m++){
               if(output[m]>0)
                  output[m]=1;
               else if(output[m]==0)
                  output[m]=input[m];
               else
                  output[m]=-1;
            }
          
            iteration++;    
            if(iteration>999)
               break;
               
            for(int i=0; i<D; i++)
               if(output[i]!=input[i])
                  flag=false;
            
            for(int i=0; i<D; i++)
               input[i]=output[i];       
     
            }while(!flag);   
            
         System.out.println("There are " + iteration + " iterations");
         System.out.println("The input pattern is ");
         for(int i=0; i<D; i++)
            System.out.print(X[i]+ "   ");
         System.out.println();
         System.out.println("The converged pattern is ");
         for(int i=0; i<D; i++)
            System.out.print(output[i]+ "   ");
         System.out.println("\n");
         } 
 
      public static void main(String args[]){
         HopfieldNetwork0 app = new HopfieldNetwork0();  
   } 
}