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BOOK: Professional Android 2 Application Development
This is the forum to discuss the Wrox book Professional Android 2 Application Development, 2nd Edition by Reto Meier; ISBN: 978-0-470-56552-0
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Old May 19th, 2011, 08:53 AM
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Default Is This Proper Java?

Is is acceptable in java to declare and type variables inside a while loop? This from Chapter 7 code:
Code:
if (toDoListCursor.moveToFirst())
    		do {
    			String task = toDoListCursor.getString(ToDoDBAdapter.TASK_COLUMN);
    			long created = toDoListCursor.getLong(ToDoDBAdapter.CREATION_DATE_COLUMN);
    			ToDoItem newItem = new ToDoItem(task, new Date(created));
    			todoItems.add(0, newItem);
    		} while (toDoListCursor.moveToNext());
    	aa.notifyDataSetChanged();
Should not
Code:
String task; long created; ToDoItem newItem;
appear before the loop and then just assignments made inside the loop? Seems like the loop will be creating hundreds of variables this way, unless Java somehow manages that automatically.
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Old May 25th, 2011, 02:52 PM
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It's proper Java. Variables should always be declared within the "tightest" scope possible. They don't get re-declared each time through the loop -- one copy of each variable is allocated each time the containing method is called.
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