ensureCapacity() vs setLength() vs trimToSize() StringBuffer

Before going into the table of ensureCapacity() vs setLength() vs trimToSize(), it is advised to refer the programs at:

1. ensureCapacity() StringBuffer Example
2. setLength() StringBuffer Example
3. trimToSize() StringBuffer Example

Following terminology is to be remembered:

1. Length: It is the number of characters present in the buffer (which generally be same or less than the capacity).
2. Capacity: It is the storing capacity of the StringBuffer object (which will be more than the length or same).

Table showing the differences ensureCapacity() vs setLength() vs trimToSize()

Property	ensureCapacity()	setLength()	trimToSize()
Capacity	Buffer capacity is set irrespective of length	Length (number of characters) is set. Buffer may be more than length	Extra buffer is deleted than required to store the characters
Length	Capacity cannot be less than length	Capacity can be more than length	Capacity and length will be same
Usage	Used to set extra buffer	Used to set the number of characters	Used to save buffer memory
Example Program	How to use ensureCapacity()?	How to use setLength()?	How to use trimToSize()?

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