Discussion
Which line contains the error?
public class Sample79
{
public static void main(String[] args)
{
Integer a = null;
int b = true ? 1 : a;
assert b == 1;
System.out.println(b);
}
}
Answer: C
Mixing an int and an Integer in a conditional forces binary numeric promotion, so BOTH branches are unboxed even though only the first is chosen. Unboxing the null throws NullPointerException before the assertion is reached. Keeping both branches the same type avoids it.
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