Important: Please, I need Answers Within 30 Minutes.

A) Class UnderGrad is a subclass of Class Student. It introduces an instance variable major, defines a constructor to initialize all its instance variables when an object of this subclass is created, and overrides its toString method. Write the code for class UnderGrad accordingly.

public class Student {

private String name;

private int id;

public Student (String name, int num) {

this.name = name;

id = num;

}

...

public String toString() {

return "Name: " + name + "; Id: " + id;

}

}

public class Undergrad{

...

}

B)Assume that code in the try block below may throw an exception.

public int doIt ( ) {// a method

int n = 0;

try {

...// code that may throw an exception

n = 1;

return 0;

}

catch (ArithmeticException e ) {

...// some actions

n = 2;

}

finally {

...// some actions

n = 3;

}

}

In this method, a value is assigned to variable n for more than once. Show all the values that are assigned to n in the order in which they are assigned under each condition given below:

a.If no exception is thrown.

b.If an ArithmeticException is thrown.

c.If anArrayIndexOutOfBoundsExceptionis thrown.