Using LRStruct to pass a test

MFlood7356

1. Define this method so that it adds the Strings in inputto an initially empty LRStruct<String> so that they appearin the same order. Example: if input contains "a", "b" and "c", in that order, the returned list must contain "a", "b" and "c", in that order.

LRStruct Class: http://www.cs.rice.edu/~mgricken/res.../LRStruct.html

Test:

Code:

@Test
	public void testABC() {
		_input.add("a");
		_input.add("b");
		_input.add("c");
		LRStruct<String> answer = _fwl.addInOrder(_input);
		String expected = "(a b c)";
		String actual = answer.toString();
		assertTrue("I thought answer would be "+expected+" but it was "+actual, expected.equals(actual));
	}

2. Here's my attempt at the method addInOrder. All I'm getting is the string c to add to the LRStruct. Not sure why my if statement isn't working correctly.

Code:

public LRStruct<String> addInOrder(List<String> input) {
	
		LRStruct<String> lrstruct = new LRStruct<String>();
		int counter = 2;
		
		if(counter>=0){
			lrstruct.insertFront(input.get(counter));
			counter--;
		}
		
		return lrstruct;
	}

JaWiB

I think what you're looking for is a loop. I.e.:

Code:

int counter = 2;

if(counter>=0){
			lrstruct.insertFront(input.get(counter));
			counter--;
		}

will do the exact same thing as

Code:

lrstruct.insertFront(input.get(2));

MFlood7356

Okay I understand that but thats the exact same thing I wrote. That's not helping me.

JaWiB

You need a loop

Doesn't Java have while loops, or for loops? Or for-each loops?

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JaWiB	I think what you're looking for is a loop. I.e.: Code: int counter = 2; if(counter>=0){ lrstruct.insertFront(input.get(counter)); counter--; } will do the exact same thing as Code: lrstruct.insertFront(input.get(2));

MFlood7356	Okay I understand that but thats the exact same thing I wrote. That's not helping me.

JaWiB	Using LRStruct to pass a test You need a loop Doesn't Java have while loops, or for loops? Or for-each loops?