It checks whether the string contains the specified sequence of char values. If yes then it returns true else false. It throws NullPointerException of ‘s’ is null. This method searches the specified ...

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 ...

The DefaultFieldSet.indexOf() method should perform field name lookups in O(1) time complexity using a precomputed index map, rather than the current O(n) linear search through the names list.