How do you remove an element while iterating?
In Java 8, we can use the Collection#removeIf API to remove items from a List while iterating it.
- 2.1 removeIf examples. IteratorApp2A.java.
- 2.2 removeIf uses Iterator. Review the Java 8 Collection#removeIf method signature, and the API uses Iterator to remove the item while iterating it.
How can we remove an object from ArrayList while iterating?
The right way to remove objects from ArrayList while iterating over it is by using the Iterator’s remove() method. When you use iterator’s remove() method, ConcurrentModfiicationException is not thrown.
Can I remove an element while enumerating through a properties object?
So the answer is – yes, if you iterate through the Properties object.
How can you avoid ConcurrentModificationException while iterating a collection?
To Avoid ConcurrentModificationException in multi-threaded environment
- You can convert the list to an array and then iterate on the array.
- You can lock the list while iterating by putting it in a synchronized block.
- If you are using JDK1.
What is NSArray Objective C?
NSArray is Objective-C’s general-purpose array type. It represents an ordered collection of objects. NSArray is immutable, so we cannot dynamically add or remove items. Its mutable counterpart, NSMutableArray, will be discussed in the second part of this tutorial.
What happens if you modify the value of an element in a list while iterating using iterators?
The size of the List is not being changed, but the object at the index is changing, so technically the List is being modified.
Can you remove an element while enumerating through a properties object if so how if not how will I remove a element while enumerating !)?
This iterator implements the remove method. So the answer is – yes, if you iterate through the Properties object.
Can ConcurrentHashMap throws ConcurrentModificationException?
ConcurrentHashMap does not throw ConcurrentModificationException if the underlying collection is modified during an iteration is in progress. Iterators may not reflect the exact state of the collection if it is being modified concurrently. It may reflect the state when it was created and at some moment later.
How do I add elements to NSArray?
If you create an NSArray you won’t be able to add elements to it, since it’s immutable. You should try using NSMutableArray instead. Also, you inverted the order of alloc and init . alloc creates an instance and init initializes it.
How to remove items from a NSArray?
NSArray is not editable, so that you cannot modify it. You can copy that array to NSMutableArray and remove objects from it. And finally reassign the values of the NSMutableArray to your NSArray. From here you will get a better idea… NSArray + remove item from array Show activity on this post.
What is the difference between NSArray and nsmutablearray?
NSArray and its subclass NSMutableArray manage ordered collections of objects called arrays. NSArray creates static arrays, and NSMutableArray creates dynamic arrays. You can use arrays when you need an ordered collection of objects. NSArray is “toll-free bridged” with its Core Foundation counterpart, CFArray.
When should I use NSArray?
You can use arrays when you need an ordered collection of objects. NSArray is “toll-free bridged” with its Core Foundation counterpart, CFArray. See Toll-Free Bridging for more information on toll-free bridging.
How do I override primitive instance methods of an NSArray?
Any subclass of NSArray must override the primitive instance methods count and object (at:). These methods must operate on the backing store that you provide for the elements of the collection. For this backing store you can use a static array, a standard NSArray object, or some other data type or mechanism.