lab-java-interfaces-and-abstract-classes/IntList.java at main · Joseph0x90/lab-java-interfaces-and-abstract-classes · GitHub

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interface IntList {
    void add(int number);
    int get(int id);
}

class IntArrayList implements IntList {
    private int[] array;
    private int size;

    public IntArrayList() {
        this.array = new int[10];
        this.size = 0;
    }

    @Override
    public void add(int number) {
        if (size == array.length) {
            int[] newArray = new int[array.length + array.length / 2];
            System.arraycopy(array, 0, newArray, 0, array.length);
            array = newArray;
        }
        array[size++] = number;
    }

    @Override
    public int get(int id) {
        if (id < 0 || id >= size) {
            throw new IndexOutOfBoundsException("Invalid index: " + id);
        }
        return array[id];
    }
}

class IntVector implements IntList {
    private int[] array;
    private int size;

    public IntVector() {
        this.array = new int[20];
        this.size = 0;
    }

    @Override
    public void add(int number) {
        if (size == array.length) {
            int[] newArray = new int[array.length * 2];
            System.arraycopy(array, 0, newArray, 0, array.length);
            array = newArray;
        }
        array[size++] = number;
    }

    @Override
    public int get(int id) {
        if (id < 0 || id >= size) {
            throw new IndexOutOfBoundsException("Invalid index: " + id);
        }
        return array[id];
    }
}