Can anyone clarify me about the api Object[] toArray(Object[])

There are two apis in Collections framework to convert the Collection elements into an array
1. Object[] toArray()
2. Object[] toArray(Object[])
Can some one explain me what does the second api - Object[] toArray(Object[]) does ?

Just read the javadoc API of the Collection interface: toArray() just returns an Object[]. But if you need for example a String[] as result use
String[] sa = o.toArray(new String[0]);

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