Thread: ArrayList Troubles.

I just learned about ArrayLists from my book and how to implement them and such. Please tell me whats different (besides the ammount and names) of these two pieces of code:

	ArrayList<String> coordsComp = new ArrayList<String>();
 
	String space11 = "(1,1)";
	String space12 = "(1,2)";
	String space13 = "(1,3)";
	String space21 = "(2,1)";
	String space22 = "(2,2)";
	String space23 = "(2,3)";
	String space31 = "(3,1)";
	String space32 = "(3,2)";
	String space33 = "(3,3)";
 
	coordsComp.add(space11);
	coordsComp.add(space12);
	coordsComp.add(space13);
	coordsComp.add(space21);
	coordsComp.add(space22);
	coordsComp.add(space23);
	coordsComp.add(space31);
	coordsComp.add(space32);
	coordsComp.add(space33);

and

		ArrayList<String> test = new ArrayList<String>();
 
		String hi = "HI!";
		String hi2 = "(1,2)";
 
		test.add("Hi!");
		test.add(hi);
		test.add(hi2);
		System.out.println("test: " +test);

The problem i am having is that the top one won't compile but the bottom one will and i can't see the difference is. Please help! If you need to know the error i get says:

 

compMove.java:17: <identifier> expected

        coordsComp.add(space11);

                      ^

compMove.java:17: <identifier> expected

        coordsComp.add(space11);

                              ^

compMove.java:18: <identifier> expected

        coordsComp.add(space12);

                      ^

compMove.java:18: <identifier> expected

        coordsComp.add(space12);

                              ^

compMove.java:19: <identifier> expected

        coordsComp.add(space13);

                      ^

compMove.java:19: <identifier> expected

        coordsComp.add(space13);

                              ^

compMove.java:20: <identifier> expected

        coordsComp.add(space21);

                      ^

compMove.java:20: <identifier> expected

        coordsComp.add(space21);

                              ^

compMove.java:21: <identifier> expected

        coordsComp.add(space22);

                      ^

compMove.java:21: <identifier> expected

        coordsComp.add(space22);

                              ^

compMove.java:22: <identifier> expected

        coordsComp.add(space23);

                      ^

compMove.java:22: <identifier> expected

        coordsComp.add(space23);

                              ^

compMove.java:23: <identifier> expected

        coordsComp.add(space31);

                      ^

compMove.java:23: <identifier> expected

        coordsComp.add(space31);

                              ^

compMove.java:24: <identifier> expected

        coordsComp.add(space32);

                      ^

compMove.java:24: <identifier> expected

        coordsComp.add(space32);

                              ^

compMove.java:25: <identifier> expected

        coordsComp.add(space33);

                      ^

compMove.java:25: <identifier> expected

        coordsComp.add(space33);

                              ^

18 errors

Press any key to continue . . .

The carrot points to right before and after space(#) not anywhere else

It compiles fine for me?!

	public static void main(String[] args) {
 
		ArrayList<String> coordsComp = new ArrayList<String>();
 
	    String space11 = "(1,1)";
	    String space12 = "(1,2)";
	    String space13 = "(1,3)";
	    String space21 = "(2,1)";
	    String space22 = "(2,2)";
	    String space23 = "(2,3)";
	    String space31 = "(3,1)";
	    String space32 = "(3,2)";
	    String space33 = "(3,3)";
 
	    coordsComp.add(space11);
	    coordsComp.add(space12);
	    coordsComp.add(space13);
	    coordsComp.add(space21);
	    coordsComp.add(space22);
	    coordsComp.add(space23);
	    coordsComp.add(space31);
	    coordsComp.add(space32);
	    coordsComp.add(space33);
 
	    System.out.println(coordsComp);
	}

Console output:

 

[(1,1), (1,2), (1,3), (2,1), (2,2), (2,3), (3,1), (3,2), (3,3)]

Originally Posted by sp11k3t3ht3rd

I was being an idiot and I forgot to put it into a method...

Glad it's resolved. I have marked this thread as solved