Discussion
The program is run with java -ea Sketch23 - what will be the output?
public class Sketch23
{
public static void main(String[] args)
{
Boolean b = null;
assert b;
System.out.println("ok");
}
}
Answer: C
A Boolean wrapper is accepted where a boolean is required because it is unboxed automatically, so this compiles. At runtime unboxing null calls booleanValue() on a null reference, which throws NullPointerException before the assertion can decide anything. Run without -ea it prints ok.
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