Mutator Methods

AP Computer Science A· difficulty 2/5

public class Switch {
    private boolean on;
    public void toggle() { on = !on; }
    public boolean isOn() { return on; }
}
// ...
Switch s = new Switch();
s.toggle(); s.toggle(); s.toggle();
System.out.println(s.isOn());

What is printed?

A
$Compile-time error$
B
$false$
C
$1$
D
$true$
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Explanation

Starting from false: toggle to true, toggle to false, toggle to true. Final value true.

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