How to set up this 2D Boolean Array?

so I have to do this problem, but these arrays are confusing me because I’m not sure how to combine a boolean with arrays and then have them properly organized. I know this is a completely incorrect code, but I really don't know what to do. These are the instructions:

Declare a 2D boolean array of size 5 and 10

Fill out the array with true if a random value is 0.5 else false

Print number of false in the array

Print the array one line per row

Print the array indexes one line per row

Print only the index of the cells with true value

  public class DoubleArray {

  public static void main(String [] args) {


  double [][] a = new double[10][15];
  int zeroCount = 0;               
  for (int i= 0; i<a.length;i++)
   {                               
      if (Math.random()>0.5)  {

           System.out.println("1" + "\t" + "1");
       }
    else 
    {

        zeroCount++;    // increment
        System.out.println("0" + "\t" + "0");

    }
}
System.out.println("Number of zeros is " + zeroCount);  

}
}