Accessor Methods

AP Computer Science A· difficulty 3/5

public class Wrap {
    private StringBuilder b = new StringBuilder("hi");
    public StringBuilder getB() { return b; }
}
// ...
Wrap w = new Wrap();
w.getB().append("!");
System.out.println(w.getB());

What is printed?

A
$hi!$
check_circle
B
$!$
C
$hi$
D
$Compile-time error$

Explanation

The getter returns the same mutable reference; appending modifies the underlying StringBuilder.

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