Insufficient String Buffer Declaration

Question

I use tool to check coding style And I got many advise :

StringBuffer constructor is initialized with size 16, but has at least 35 characters appended.

Here is some of my code:

final StringBuffer Contents = new StringBuffer();

WHy whould this happen?
How did it count 35 characters?
How can I edit the size of StringBuffer ?
Or What method should I use to solve this problem??

Answer 1

Changing the capacity of a StringBuffer after it has been created is more costly than creating it with the expected needed capacity.

Use this constructor to remove this warning:

    /**
     * Constructs a string buffer with no characters in it and
     * the specified initial capacity.
     *
     * @param      capacity  the initial capacity.
     * @exception  NegativeArraySizeException  if the <code>capacity</code>
     *               argument is less than <code>0</code>.
     */
    public StringBuffer(int capacity) {
        super(capacity);
    }