如何减少碰撞机会??

import java.util.*;



class  t1

{

	public static void main(String[] args) 

	{

		Object[][][] ojb1 = new Object[10][5][9];

		Object[][][] ojb2 = new Object[7][5][9];

		Object[][][] ojb3 = new Object[6][5][9];

		int total = 0;

		int count = 0;



		for(int i=0; i<104; i++ ){



			while(count < 100){

				int x = (int) (Math.random() * 5);

				int y = (int) (Math.random() * 9);

				int z = (int) (Math.random() * 10);

				int m = (int) (Math.random() * 7);

				int n = (int) (Math.random() * 6);

				

				if(ojb1[z][x][y] == null && ojb1[m][x][y] == null && ojb3[n][x][y] == null){

					ojb1[z][x][y] = new String("No Empty");

					ojb1[m][x][y] = new String("No Empty");

					ojb1[n][x][y] = new String("No Empty");

					System.out.println("Added "  + i);

					break;

				}else{

					count+=1;

				}

			}





			if(count >=100){

				System.out.println("Conflict "  + i);

				total +=1;

			}



		}



		System.out.println("Total of conflict: " + total);

	}

}