How to switch the class in java

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Java

Hello coders, I want to refactor the switch statement to a enum class. The result of the code: creates a box and put particles inside the box, then make particles move freely and if two particles collide a new particle will be added inside the box. Help us some hints to do. One more, I knew when I pasted my code in here (I asked my team and they agreed), it will be copied easily by another person. How can I prevent that? Thanks.

What I have tried:

Box class:

import java.util.Random;

public class box{
	private final int WIDTH = 25;
	private final int HEIGHT = 6;
	private final int PARTICLE_MAX = 300;
	private static box box;
	private particle[] particleList = new particle[PARTICLE_MAX];
	private Random r = new Random();
	
	private box(){
		for(int i = 0; i<3;i++){
			addNewParticle();
		}
	}
	
	public int getWidth(){
		return WIDTH;
	}
	
	public int getHeight(){
		return HEIGHT;
	}
	
	public int getParticleMax(){
		return PARTICLE_MAX;
	}
	
	public static box getInstance(){
		if(box == null)
			box = new box();
		return box;
	}
	
	public void makeParticlesMove(){
		int n;
		for(particle particle:particleList){
			if(particle != null){
				n = r.nextInt(8)+1;
				switch(n){
					case 1: if(particle.getY()-1 > 0){
								particle.north();
								
							}
							break;
					case 2: if(particle.getY()-1 > 0 && particle.getX()+1 < WIDTH-1){
								particle.northeast();
								
							}
							break;
					case 3: if(particle.getX()+1 < WIDTH-1){
								particle.east();
								
							}
							break;
					case 4: if(particle.getY()+1 < HEIGHT-1 && particle.getX()+1 < WIDTH-1){
								particle.southeast();
								
							}
							break;
					case 5: if(particle.getY()+1 < HEIGHT-1){
								particle.south();
								
							}
							break;
					case 6: if(particle.getY()+1 < HEIGHT-1 && particle.getX()-1 > 0){
								particle.southwest();
								
							}
							break;
					case 7: if(particle.getX()-1 > 0){
								particle.west();
								
							}
							break;
					case 8: if(particle.getY()-1 > 0 && particle.getX()-1 > 0){
								particle.northwest();
								
							}
							break;
				}
			}
		}
		collisionCheck();
	}
	
	public int particleCount(){
		int p = 0;
		for(particle particle:particleList){
			if(particle !=null){
				p++;
			}
		}
		return p;
	}
	
	public void showParticles(){
		char[][] map = new char[WIDTH][HEIGHT];
		for(particle p:particleList){
			if(p != null){
				int x = p.getX();
				int y = p.getY();
				map[x][y] = '*';
			}
		}
		for(int i = 0; i < WIDTH; i++)
			System.out.print("-");
		System.out.println();
		
		for(int j = 1; j < HEIGHT-1; j++){
			System.out.print("|");
			for(int c = 1; c < WIDTH-1; c++){
				if(map[c][j] == '*')
					System.out.print("*");
				else
					System.out.print(" ");
			}
			System.out.println("|");
		}
		for(int i = 0; i < WIDTH; i++)
			System.out.print("-");
		System.out.println();
	}
	
	public void collisionCheck(){
		boolean[][] map = new boolean[WIDTH][HEIGHT];
		for(int i =0; i<HEIGHT; i++){
			for(int j = 0; j<WIDTH; j++)
				map[j][i] = false;
		}
		for(particle p:particleList){
			if(p != null){
				int x = p.getX();
				int y = p.getY();
				if(map[x][y]) {
					System.out.println("Collided!!!!");
					addNewParticle();
				}
				else
					map[x][y] = true;
			}
		}
	}
	
	public void addNewParticle(){
		for(int i = 0; i < PARTICLE_MAX; i++){
			if(particleList[i] == null){
				particleList[i] = new particle(r.nextInt(WIDTH-2)+1, r.nextInt(HEIGHT-2)+1);
				break;
			}
		}
		
	}
}

particle class:

public class Particle{
	private int x;
	private int y;
		
	public Particle(int x, int y){
		this.x = x;
		this.y = y;
	}
	
	public void setX(int x){
		this.x = x;
	}
	
	public void setY(int y){
		this.y = y;
	}
	
	public int getX(){
		return x;
	}
	
	public int getY(){
		return y;
	}
	
	public void north(){
		y-=1;
	}
	
	public void northeast(){
		y-=1;
		x+=1;
	}
	
	public void east(){
		x+=1;
	}
	
	public void southeast(){
		y+=1;
		x+=1;
	}
	
	public void south(){
		y+=1;
	}
	
	public void southwest(){
		y+=1;
		x-=1;
	}
	
	public void west(){
		x-=1;
	}
	
	public void northwest(){
		y-=1;
		x-=1;
	}
}

test:

public class Main{	
	public static void main(String[] args){
		Box b = Box.getInstance();
		do{
			System.out.println("Particle count: " + b.particleCount());
			b.makeParticlesMove();
			b.showParticles();
			try{
				Thread.sleep(300);
			}catch (Exception e){
				System.out.println(e);
			}
		}while(b.particleCount() < b.getParticleMax());
	}
}