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Many of the container type data structures in Java come with a clear() method. For example, we can call clear() on a Vector we want to clear out all the contents in the Vector. My question is after applying the clear() method, does the content in the vector get nulled out or are they still being referenced? Thanks.
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clear() deletes every element from the collection and removeAll() one only removes the elements matching those from another Collection.
The clear() method removes all the elements from a list.
The clear() of java. util. Collection interface is used to clear the Collection upon which it is called. This method does not take any parameter and does not returns any value.
StringBuffer: Java is popular. Updated StringBuffer: In the above example, we have used the delete() method of the StringBuffer class to clear the string buffer. Here, the delete() method removes all the characters within the specified index numbers.
They are no longer referenced by the Collection, but if you have any references anywhere in your code, that reference continues to exist as it was.
As mentioned, Vector's source does call:
// Let gc do its work
for (int i = 0; i < elementCount; i++)
elementData[i] = null;
However, this is setting it's internal reference to null (pass-by-value) and will not affect any external references.
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