How to print a method in java

First your method won’t print the good fibonnaci numbers, and to print it you need to instanciate a FibonacciSequence Object since the method is not static :

public int fibonacci(int numArray[]) {
    for (int i = 1; i < numArray.length - 1; i++) {
        System.out.print(numArray[i] + numArray[i - 1] + " ");
    }
    return numArray[10];
}

public static void main(String[] args) {
    FibonacciSequence fbs = new FibonacciSequence();
    fbs.fibonacci(new int[]{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10});      
}

Prints : 1 3 5 7 9 11 13 15 17

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If you don’t want to use recursion, you can do like this (and see how to print easily an array):

public int[] fibonacci(int size) {
    int[] res = new int[size];
    res[0] = 0;
    res[1] = 1;
    for (int i = 2; i < size; i++) {
        res[i] = res[i - 1] + res[i - 2];
    }
    return res;
}

public static void main(String[] args) {
    FibonacciSequence fbs = new FibonacciSequence();
    int[] arrayREs = fbs.fibonacci(10);
    System.out.println(Arrays.toString(arrayREs));
}

Prints : [0, 1, 1, 2, 3, 5, 8, 13, 21, 34]