To replace an element in Java ArrayList, set() method of java.util. ArrayList class can be used. The set() method takes two parameters-the indexes of the element which has to be replaced and the new element. The index of an ArrayList is zero-based. So, to replace the first element, 0 should be the index passed as a parameter.
public Object set(int index, Object element)
Return Value: The element which is at the specified index
Exception Throws: IndexOutOfBoundsException
when the index is out of range
i.e, index < 0 or index >= size()
[A, B, C, D] [A, B, E, D] java.lang.IndexOutOfBoundsException: Index 6 out of bounds for length 4
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