Lista.java

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package plp.imperative1.util;


public class Lista<T> {
        protected T head;
    protected Lista<T> tail;
    
    
    public Lista(){
        head = null;
                tail = null;
    }
    
    
    public Lista(T valor,  Lista<T> lista){
        this.head = valor;
        this.tail = lista;
    }
    
    
    public int length() {
       
        if ( head  == null) {
            return  0;
        }else if (tail == null) {
            return 1;
        } else {
            return 1 + tail.length();
        }
        
    }
    
    public  T getHead() { 
        return head;
    }
    
    public Lista<T> getTail() {  
        return tail;
    }
    
    public String toString(){
        StringBuffer resposta = new StringBuffer();
        resposta = this.getString(resposta);
        return resposta.toString();
    }
    
    private StringBuffer getString(StringBuffer resposta){ 
        if(head != null) {
            if ( tail != null) {
                resposta = tail.getString(resposta);
            }
            resposta.append(head.toString()+" ");
        }
        return resposta;
    }
        
}

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