the percolation.java consists the following code

/****************************************************************************** * Compilation: javac Percolation.java * Execution: java Percolation = n) return; // invalid row if (j = n) return; // invalid column if (!isOpen[i][j]) return; // not an open site if (isFull[i][j]) return; // already marked as full // mark i-j as full isFull[i][j] = true; flow(isOpen, isFull, i+1, j); // down flow(isOpen, isFull, i, j+1); // right flow(isOpen, isFull, i, j-1); // left flow(isOpen, isFull, i-1, j); // up } // does the system percolate? public static boolean percolates(boolean[][] isOpen) { int n = isOpen.length; boolean[][] isFull = flow(isOpen); for (int j = 0; j   These are the two deliverables: 1. Percolation2.java: Modify Percolation.java to simulate directed (down) percolation. That means the liquid flow can't go up. Name your class Percolation2.java. 2. Estimate. java: Based on PercolationProbability.java, write a program that uses both versions of percolation and compute the probability that a system percolates, but does not percolate directed downward, you need N and p from the command line. You need to generate random numbers based on the seed. The random number generator can be initialized using the following statement: private static final Random RNG = new Random (Long.getLong ("seed", System.nanoTime())); Here are some examples: Command (for Percolation2.java): java Percolation 2