Core Java

What the function of capacity() method of StringBuilder class in java?

This is used to return the current capacity.

What the function of reverse() method of StringBuilder class in java?

What the function of delete(int startIndex, int endIndex) method of StringBuilder class in java?

What the function of replace(int startIndex, int endIndex, String str) method of StringBuilder class in java?

What the function of insert(int offset, String s) method of StringBuilder class in java?

What the function of append(String s) method of StringBuilder class in java?