How does autoboxing work in java What causes JavaChamp Team Flash

Question 130 / 297: What causes the compilation to fail?
Choose 2

public class Tester {

	public static void main(String[] args) {

		Long var = (long) 999; // Line 3

		long x1 = var.longValue(); // Line 5

		double x2 = var.longValue(); // Line 7

		double x3 = (double) var.longValue(); // Line 9

		Double x4 = Long.valueOf("999"); // Line 11

		Number x5 = Integer.parseInt("999"); // Line 13

		Long x6 = Integer.parseInt("999"); // Line 15
	}

}

Line 3

Line 5

Line 7

Line 9

Line 11

Line 13

Line 15

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Explanation:

Double x4 = Long.valueOf("999");

the right hand side returns a Long which cannot be widen to a Double

Long x6 = Integer.parseInt("999");

the right hand side returns an int value which be wrapped to an Integer but cannot be widen to a Long

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