import java.util.Vector;

public class StackTest extends Vector<Object> {

	public void push(Object o) {
		this.addElement(o);
	}

	public Object pop() {
		Object o = this.peek();
		int len = this.size();

		if (o != null)
			this.remove(len - 1);
		return o;
	}

	public Object peek() {
		int len = this.size();

		if (len > 0) {
			return elementAt(len - 1);
		}
		return null;
	}

	public int search(Object o) {
		int i = this.lastIndexOf(o);

		if (i >= 0) {
			return size() - i;
		}
		return -1;
	}

	public boolean empty() {
		return this.size() == 0;
	}

	public static void main(String[] args) {
		StackTest s = new StackTest();
		int len=10;
		for(int i=0; i< len; i++){
			s.push(new Integer(i));
		}
		
		System.out.println("Spitze(1): " + ((Integer) s.peek()).intValue());
		for(int i=0; i<4; i++){
			System.out.println("entnehme: " + s.pop());
		}
		System.out.println("Spitze(2): " + ((Integer) s.peek()).intValue());
		System.out.println("3 an Position: " + s.search(new Integer(3)));
	}
}