Does isEmpty check for NULL?

isEmpty() Returns true if the string is null or empty.

How do I check if a string is empty or null?

Using the isEmpty() Method The isEmpty() method returns true or false depending on whether or not our string contains any text. It’s easily chainable with a string == null check, and can even differentiate between blank and empty strings: String string = “Hello there”; if (string == null || string.

How do I check if a collection is empty?

The isEmpty() of java. util. Collection interface is used to check if the Collection upon which it is called is empty or not. This method does not take any parameter and does not returns any value.

How do you check if an ArrayList contains null?

ArrayList isEmpty() in Java with example The isEmpty() method of ArrayList in java is used to check if a list is empty or not. It returns true if the list contains no elements otherwise it returns false if the list contains any element. Parameter: It does not accepts any parameter.

When to use collectionutils.isnotempty ( Coll )?

If the collection coll is not null but it is empty, nor Branch1 either Branch2 is executed, because the condition coll != null is true, but in loop for there is not even one pass. Of course, if expression coll != null && coll.isNotEmpty () doing the same work as CollectionUtils.isNotEmpty (coll).

How to check if a list is empty in collectionutils?

isNotEmpty () method of CollectionUtils can be used to check if a list is not empty without worrying about null list. So null check is not required to be placed everywhere before checking the size of the list.

When to use null check in Commons Collections?

So null check is not required to be placed everywhere before checking the size of the list. coll − The collection to check, may be null. True if empty or null. The following example shows the usage of org.apache.commons.collections4.CollectionUtils.isEmpty () method.

Which is better a null or a collectionutils?

Even if there is, it would be extremely small. It just prevents the creation of an Iterator and executing a branch instruction, that’s all there is to it. This small advantage occurs only when the collection is empty. The following loop: for (String str : coll) {