import java.util.Deque;
import java.util.ArrayDeque;

public class Exemple{
    public static void main(String[] args){
	// 3 + 4 × (2 − 1)
	// pas de parenthèse encore, je fais 3 + 4 * 2
	Deque<AbstractToken> expression = new ArrayDeque<AbstractToken>();
	expression.addLast(new TokenConstant(3));
	expression.addLast(new TokenOperator(Operator.ADD));
	expression.addLast(new TokenConstant(4));
	expression.addLast(new TokenOperator(Operator.MUL));
	expression.addLast(new TokenConstant(2));

	StringBuilder b = new StringBuilder();
	for(AbstractToken t : expression ){
	    b.append(t.toString());
	}
	System.out.println(b.toString());
	
    }
	
}