in java please

Refer to the program in #7 in CommonProgrammingErrors document. Without running the program, guess the output of the program? Output Run the program in #8 in Common ProgrammingErrors document. Explain why the error occurred? 7. Confusion over passing by value, and passing by reference Primitive types are passed by value, and objects are passed by reference. public class CommonMistakes { private static class SomeClass public int myInt; publis SomeClass (int x) my Int = x; public static void swapInt(int a, int b) int temp = a; a = b; b = temp; b public static void swapSomeClass (SomeClass a, SomeClass b) int temp = a.myInt; a.my Int = b.my Int; bimyInt = temp; public static void main(String[] args) int x = 10; int y = 20; System.out.println("Before Swap: x = " + x + " y = " + y); swap Int. (x, y); System.out.println("After Swap: x = " + x + " y = " + y); SomeClass p = new SomeClass(10); SomeClass q = new SomeClass (20); System.out.println("Before Swap: p = " + PomyInt + " q = " + 9.my Int); swapSomeClass IP, q); System.out.printin ("After Swap: p = " + P.myInt + " q = " + q.myInt); 8. NULL Pointer Exceptions String[] names = new String[5]; for (int k = 0; k