Given the following declarations:
StringBuilder buffer = new StringBuilder("Testing Testing");
Buffer.setLength(7);
Buffer.ensureCapacity(5);
Which of the following is true?
A) buffer has capacity 5.
B) buffer has capacity 31.
C) buffer has content "Testin".
D) buffer has length 15.

Question

Given the following declarations: 
StringBuilder buffer = new StringBuilder("Testing Testing");
Buffer.setLength(7);
Buffer.ensureCapacity(5);
Which of the following is true?
A) buffer has capacity 5.
B) buffer has capacity 31.
C) buffer has content "Testin".
D) buffer has length 15.

Quizplus · Accepted Answer

The initial capacity of a StringBuilder is 16 plus the length of the string. "Testing Testing" has length 15, so the initial capacity is 31. The setLength(7) method sets the length to 7, but does not affect capacity. The ensureCapacity(5) method does not change the capacity because it is already greater than 5.

Given the Following Declarations