How can you query boolean values ​​of integers in Java?

The class “Quadrat” is what you have built in class, so of course I can’t tell exactly what methods it has. Did you implement a method with the signature “public boolean equals(boolean)” for the class? If yes, this is usually only used to compare a value, but not to write a value in the array.

With “new square[11][2], you’ll only create an empty array. You should write a new square object for each element. As you seem to only work with boolean values, it might be more skillful to use a boolean array.

As I understand the task, one should set the first element to true with a 50:50 probability and if it is true, one should set the second element to true again with a 50:50 probability. In your variant, however, one of the two elements is randomly selected, which is then set to false and then it is checked whether the first element false is the respective other one set to true.

So once your variant is rebuilt so that it can at least be compiled:

  public static void main(String[] args) {
    var feld = new boolean[2][11];
    var zufall = new Random();

    for (int i=0; i<11; i++) {
      if (zufall.nextInt(2) == 0) {
        feld[0][i] = false;
        feld[1][i] = true;
      } else {
        feld[0][i] = true;
        feld[1][i] = false;
      }
    }
  }

And once the variant I understand it:

  public static void main(String[] args) {
    var feld = new boolean[11][2];
    var zufall = new Random();

    for (int i = 0; i < 11; i++) {
      if (zufall.nextBoolean()) {
        feld[i][0] = true;
        if (zufall.nextBoolean()) {
          feld[i][1] = true;
        }
      }
    }
  }