How to optimize this code to make it faster

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I am a really really new noobie high school student in java and we're currently optimizing a project but I'm stuck now. I think I've down everything I can do. Below are my 3 classes. PS, These codes print out the time spent in while loop and I'm trying to get it down to less than 1 sec on my computer. It's running between 1.49 and 1.38 currently.


public class code {
    public static void main(String[] args) {
        int numRows = 30;
        int numCols = 30;
        int start = 31;
        int exit = 868;
        int numKittens = 30_000;
        KittenBox box = new KittenBox(numRows, numCols, start, exit, 
        double a = 10;;

import java.util.SplittableRandom;

public class Kitten {

private int rows;
private int columns;
public int square;
private SplittableRandom a;

public Kitten(int rows, int columns, int square) {
    this.rows = rows;
    this.columns = columns;
    this.square = square;
    a = new SplittableRandom();

public int move() {
    int i = a.nextInt(1, 5);
    return (i == 1 && (!(this.square < columns))) ? 
            this.square -= rows : ((i == 2 && (!(this.square >= columns * 
            (rows - 1)))) ? this.square += rows : ((i == 3 && (!(this.square
            % rows == 0))) ? this.square -= 1 : ((!(this.square % rows == 
            rows - 1)) ? this.square += 1 : this.square)));


public class KittenBox {

    private ArrayList<Kitten> kitten;
    private int numRows;
    private int numCols;
    private int start;
    private int exit;
    private int numKittens;

    public KittenBox(int numRows, int numCols, int start, int exit, int numKittens) {
        this.numRows = numRows;
        this.numCols = numCols;
        this.start = start;
        this.exit = exit;
        this.numKittens = numKittens;
        kitten = new ArrayList<>();

    public void play() {
        for (int i = 0; i < numKittens; i++) {
            kitten.add(new Kitten(numRows, numCols, start));
        long startTime = System.nanoTime();
        while (!kitten.isEmpty()) {
            for (int i = 0; i < kitten.size(); i++) {
                if (kitten.get(i).square == exit) {
        long endTime = System.nanoTime();
        System.out.format("Kittens took %f seconds to escape.\n",
                (endTime - startTime) / 1000000000.0);

but I still can't speed my code up to the benchmark. is there any way that's faster?

thanks a lot.

You can opt for:

Math.random() // it has reliable efficiency.

you can refer following program:

        int max = 5; 
        int min = 1; 
        int range = max - min + 1; 

        // generate random numbers within 1 to 10 
        for (int i = 0; i < max; i++) { 
            int rand = (int)(Math.random() * range) + min; 

            // Output is different everytime this code is executed 

Make Java fast: Optimize!, Make Java fast: Optimize! How to get the greatest performance out of your code through low-level optimizations in Java -- complete with a� Also, this helps in refactoring the code to make it faster. We will get to it later. 2. Get the code working first. People have their own coding styles. Use the coding style that you are most comfortable with. For the first iteration, make the code work, at least and make the submission. See if it passes for all the test cases.

Not sure how fast this is, but you could try this

int randomNumber = (int)(Math.random() * range_size + starting_num);
int one_to_four = (int)(Math.random() * 4 + 1);

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