1-2 Java term Question solve 2021 session: 2020-2021

Here is the description video for the 3 questions.
Q-1:
Make a class Employee with a name and salary. Make a class Manager inherits from Employee. Add an instance variable, named department, of type String. Supply a method toString that prints the manager's name, department, and salary. Make a class Executive inherits from Manager. Supply appropriate toString methods for all classes. Supply a test program that tests these classes and methods.

Solve:
class Employee {
private String name;
private double salary;

public Employee(String name, double salary) {
this.name = name;
this.salary = salary;
}

public String toString() {
return "Name: " + name + ", Salary: " + salary;
}
}

class Manager extends Employee {
private String department;

public Manager(String name, double salary, String department) {
super(name, salary);
this.department = department;
}

public String toString() {
return super.toString() + ", Department: " + department;
}
}

class Executive extends Manager {

public Executive(String name, double salary, String department) {
super(name, salary, department);
}

public String toString() {
return "Executive: " + super.toString();
}
}

public class Q1 {
public static void main(String[] args) {
Employee emp = new Employee("Meena", 10000);
System.out.println(emp.toString());

Manager mng = new Manager("Raju", 20000, "Sales");
System.out.println(mng.toString());

Executive exec = new Executive("Mithu", 30000, "Marketing");
System.out.println(exec.toString());
}
}

Q-2:
Write a program MatrixSum (MatrixSum.java) that reads two input files which contain two matrices of size 3x4. Then write the sum of these two matrices into another file. For example, if you call

java MatrixSum A.txt B.txt C.txt

Then the program will read two input matrices from A. txt, B.txt and write the sum of these two input matrices into C.txt

#Solution:

Q-3:
Write a java class Example_throw, in which we have a method testMethod with an integer parameter. Declare two exceptions Exp1 and Exp2 using the throws keyword which will be activated depending on the value of the integer parameter. Then in the main function within ExceptionHandle class, the exceptions thrown are handled by the catch block.

Don't know why yt is not allowing to write the solutions of q-2,3 in the description.
Go through the video for the solutions