Question 1: Consider the following java class public class Test { public static void main(String[] args) { try { System.out.println(1/0) ; } catch (NullPointerException ex) { System.out.println(NullPointerException); } catch (IndexOutOfBoundsException ex) { System.out.println("Exception IndexOutOfBoundsException "); } finally { System.out.println("Finally in main"); } System.out.println("End of main"); } 1.1 The output of the class is : . 1.2 Change the instruction System.out.println(1/0) thus the exception NullPointerException is caught. 1.3 Change the instruction System.out.println(1/0) thus the exception IndexOutOfBoundsException is caught. Question 2: user defined exception. Consider the following java classes: class NegativeException extends Exception { private int e; NegativeException (int num1) { e = num1; } public String toString() { return "(" + e +") is less than 0"; } } class Demo1 { static void sum(int num,int num1) throws NegativeException { if(num1<0) { throw new NegativeException (num1); } else { System.out.println(num+num1); } } public static void main(String[] args) { try { sum(-5, 4); } catch(NegativeException e1) { System.out.println(e1); } } } 2.1 : The class output is : 2.2 Similarly to the classes above write the following classes : - ZeroException class that prints the message the Number is Zero - DemoDivision that contains a method : - static int division(int num1,int num2) throws ZeroException {} that calculates num1/num2 and throws the ZeroException when the num2 is equal to 0. - Write the main function. Question 3: Working with Files 3.1 : Ordinary file creation - Create a new folder named FileDemo - Open NotePad and create in FileDemo a new file named fname.txt. Write your Student Id and Your name and save the file. - Check if the file fname.txt exists in the folder FileDemo. The size of the file is . - The absolute path to the file is . 3.2 : A java code to read the file content : import java.io.File; import java.util.Scanner; public class ReadFromFileUsingScanner { public static void main(String[] args) throws Exception { // pass the path to the file as a parameter File file = new File(".); Scanner sc = new Scanner(file); while (sc.hasNextLine()) System.out.println(sc.nextLine()); } } - The output is - Add 3 new names in the file and run the class. The new output is . 3.3 Write a text to a file public class WriteFile { // Main driver method public static void main(String[] args) { // Content to be assigned to a file // Custom input just for illustration purposes String text = " Salam Alaykom"; // Try block to check if exception occurs try { // Create a FileWriter object // to write in the file Path / file name FileWriter fWriter = new FileWriter( ."); fWriter.write(text); // Closing the file writing connection fWriter.close(); // Display message for successful execution of // program on the console System.out.println("File is created successfully with the content."); } // Catch block to handle if exception occurs catch (IOException e) { // Print the exception System.out.print(e.getMessage()); } } } - Complete the instruction FileWriter fWriter = new FileWriter( ."); and run your program - Check the content of your file. Conclude . - Write a new java code to append a new content to your file.