indexOf(Object o ... returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element. 2. lastIndexOf(Object o) : This method returns ...

The characters in a string have indices that run from 0 to string.length() - 1. The method charAt() returns the character at a specified index. The boolean operator ( == ) returns true only if the two ...

int indexOf(Object o) : method is used to check and find the occurrence of a particular element in the list. If the element is present then the index of the first occurrence of the element is returned ...