import java.util.List;
import java.util.Vector;

/**
 * {@link <a href=
 * "https://[Log in to view URL]"
 * target= "_blank">Primitive Vector<E></a>}
 * 
 * @author itammb ( Italia Massimiliano Buscati )
 * @version JDK 1.15
 *
 */
class Main {
	/**
	 * @see Vector#ensureCapacity(int)
	 * @see Vector#capacity()
	 *
	 */
	public static void applayMethodEnsureCapacity(Vector<Integer> buffer, int minCapacity) {
		buffer.ensureCapacity(minCapacity);
		applayLoop(buffer);
		System.out.println(buffer.capacity());
		buffer.add(4);
		buffer.add(5);
		System.out.println(buffer.capacity());
		applayLoop(buffer);
	}

	/**
	 * @see Vector#copyInto(Object[])
	 *
	 */
	public static void applayMethodCopyInto(Vector<Integer> buffer) {
		applayLoop(buffer);
		Object[] copy = new Object[buffer.size()];
		buffer.copyInto(copy);

		// verifica l'indipendenza della struttura
		println(copy);
		copy[0] = -1;

		println(copy);
		applayLoop(buffer);
	}

	/**
	 * @see List#size()
	 * @see List#get(int)
	 *
	 */
	public static void applayLoop(Vector<Integer> buffer) {
		if (buffer.isEmpty())
			System.out.print("[]");
		else
			for (int i = 0; i < buffer.size(); i++)
				System.out.print("[i=" + i + ", e=" + buffer.get(i) + "] ");

		println();
	}

	private static void println() {
		System.out.println();
	}

	private static void println(Object[] objArray) {
		for (int i = 0; i < objArray.length; i++)
			System.out.print("[i=" + i + ", e=" + objArray[i] + "] ");

		println();
	}

	/**
	 * @see Vector#add(Object)
	 *
	 */
	private static Vector<Integer> createBufferTest() {
		return new Vector<Integer>(4) {
			private static final long serialVersionUID = -69L;

			{
				add(1);
				add(2);
				add(3);
			}
		};
	}

	public static void main(String args[]) throws Exception {
		// Unit test - capacità di memorizzazione predefinita
		applayMethodEnsureCapacity(createBufferTest(), 4);
		// Unit test - copia di una struttura
		applayMethodCopyInto(createBufferTest());
	}
}