Back command using Stack

Question

Hey guys posted on here last night, the replies were great..thanks for that...I got one minor problem...
private void goRoom(Command command)
        if(!command.hasSecondWord())
            // if there is no second word, we don't know where to go...
            System.out.println("Go where?");
            return;
        String direction = command.getSecondWord();
        // Try to leave current room.
        Room nextRoom = currentRoom.nextRoom(direction);
        if (nextRoom == null)
            System.out.println("There is no door!");
        else
            stack = new Stack();  <---------------------------------------------------makes a new stack
            currentRoom = nextRoom;  <-------------------------------------------this here takes the person into the next room
            System.out.println(currentRoom.longDescription());
            stack.push(currentRoom);   <------------------------------------------- everytime a person enters the next room it records it in a stack
    private void stepBack(Command command)
        if(stack.isEmpty()) {
            System.out.println("Sorry, cannot go back!");
            return;
        if(command.hasSecondWord()) {
            // if there is a second word, we cannot go back...
            System.out.println("I don't know what you mean...");
            return;
            stack.pop();            <------------------------------------------------------------------------------------------- I can now pop, but i need to use this value so it goes back in the room you came from
            currentRoom = ;      <------------------------------------------------------------------------------------------- What do i put as the syntax in here to successfully use the value from stack.pop() to go back in the previous room. Hope your able to help, thanks guys!!
            System.out.println(currentRoom.longDescription()); //print method where you are
        }

Answer 1

private void goRoom(Command command)
        if(!command.hasSecondWord())
            // if there is no second word, we don't know where to go...
            System.out.println("Go where?");
            return;
        String direction = command.getSecondWord();
        // Try to leave current room.
        Room nextRoom = currentRoom.nextRoom(direction);
        if (nextRoom == null)
            System.out.println("There is no door!");
        else
            stack = new Stack();
            currentRoom = nextRoom;
            stack.push(currentRoom);
            System.out.println(currentRoom.longDescription());
    private void stepBack(Command command)
        if(stack.isEmpty()) {
            System.out.println("Sorry, cannot go back!");
            return;
        if(command.hasSecondWord()) {
            // if there is a second word, we cannot go back...
            System.out.println("I don't know what you mean...");
            return;
            currentRoom = (Room)stack.pop();
            System.out.println(currentRoom.longDescription()); //print method where you are
        }I have this implemented, but everytime i type in back it doesnt actually move back to the previous room. Can anyone suggest why? or am I doing something wrong here, thanks!