public static void main(String[] args) {
     // input data
    int[] array1 = new int[]{12, 23, -22, 0, 43, 545, -4, -55, 43, 12, 0, -999, -87};
    // how many negative and non-negative values there are
    int nonNegativeCount = 0;
    int negativeCount;

    // count non-negative
    for (int i = 0; i < array1.length; i++) {
      if (array1[i] >= 0) {
        nonNegativeCount++;
      }
    }
    // rest must be negative
    negativeCount = array1.length - nonNegativeCount;
    // declare arrays of correct length
    int[] arrayPlus = new int[nonNegativeCount];
    int[] arrayMinus = new int[negativeCount];

    // copy to appropriate arrays
    int plusCounter = 0; // pointer to current position in plus array
    int minusCounter = 0; // negative array pointer
    for (int i = 0; i < array1.length; i++) { // iterate through input
      if (array1[i] >= 0) { // if its non-negative
        arrayPlus[plusCounter] = array1[i]; // put in plus array
        plusCounter++; // and move on
      } else {
        arrayMinus[minusCounter] = array1[i];
        minusCounter++; // put in minus array
      }
    }

    System.out.println("Positive array numbers");
    for (int i = 0; i < nonNegativeCount; i++) {
      System.out.println(arrayPlus[i]);
    }


    System.out.println("Negative array numbers");
    for (int i = 0; i < negativeCount; i++) {
      System.out.println(arrayMinus[i]);
    }

  }