Home » Oracle » 1z0-803 » Which statement initializes a stringBuilder to a capacity of 128?
Which statement initializes a stringBuilder to a capacity of 128?
A. StringBuilder sb = new String ("128");
B. StringBuilder sb = StringBuilder.setCapacity (128);
C. StringBuilder sb = StringBuilder.getInstance (128);
D. StringBuilder sb = new StringBuilder (128);
Correct Answer: D
Explanation/Reference:
Explanation:
StringBuilder (int capacity)
Constructs a string builder with no characters in it and an initial capacity specified by the capacity argument.
Note: An instance of a StringBuilder is a mutable sequence of characters.
The principal operations on a StringBuilder are the append and insert methods, which are overloaded so as to accept data of any type. Each effectively converts a given datum to a string and then appends or inserts the characters of that string to the string builder. The append method always adds these characters at the end of the builder; the insert method adds the characters at a specified point.
Incorrect answers:
StringBuilder sb = new String("128");
StringBuilder not String is required.
setCapacity or getInstance do not work.
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