Stack.java

public class Stack {
	
	private Element top;
	private Integer tam;
	private Element temp;
	
	public Stack(){
		this.top = null;
		this.tam = 0;
	}
	
	public boolean empty(){
		if(tam == 0){
			return true;
		}else{
			return false;
		}
	}
	
	public void add(Element element){
		if(empty()){
			tam++;
			top = element;
			element.setAntElement(null);
		}else{
			tam++;
			temp = top;
			top = element;
			element.setAntElement(temp);
		}
	}
	
	public Integer getTopValue(){
		if(!empty())
			return this.top.getElementValue();
		else
			return null;
	}
	
	public Element getTop(){
		return this.top;
	}
	
	public boolean remove(){
		if(empty()){
			return true;
		}else{
			top = getTop().getAntElement();
			tam--;
			return true;
		}
	}
	
	public String search(Integer elm){
		if(empty()){
			return "Pilha Vazia";
		}else{
			Element temp = getTop();
			Integer temp_tam = tam;
			while(temp_tam > 0){
				if(temp.getElementValue() == elm)
					return "Achou -> " + temp.getElementValue();
				temp_tam--;
				temp = temp.getAntElement();
			}
		}
		return null;
			
	}
	
	public Integer tamanho(){
		return this.tam;
	}
}