Java Core Classes and Threads

The method 'toLowerCase()' converts all the characters in a string from uppercase to lowercase.

The 'ensureCapacity()' method is used to set the size of the buffer.

The 'reverse()' method is used to reverse the characters within a StringBuffer() object.

The 'insert()' method inserts one string into another. It is overloaded to accept value of all the simple types, plus Strings & Objects.

The 'delete()' method deletes a sequence of characters from the invoking object.

 The 'getChars()' method is used to copy a substring of a StringBuffer into an array.

The 'regionMatches()' method compares a specific region inside a string with another specific region in another string.

The 'append()' method concatenates the string representation of any other type of data to the end of the invoking StringBuffer object.

The 'startWith()' method determines whether a given string begins with a specified string.

The 'endWith()' method determines whether the string in question ends with a specified string.

This exception is thrown when an application attempts to use null where an object is required.

All are the true statement.

StringTokenizer class belongs to this package.

Circular linked list is efficient as compared to others because it has same time complexity for insertion at the first, middle and end.

This method raises deprecation warning.