Question

Add appropriate descriptive comments to EACH line of the code in the project explaining why the code is in the application.

import java.io.*;

public class ExceptionTesterApp {

public static void main(String[] args) {
System.err.println("In main: calling method1.");
method1();
System.err.println("In main: returned from method1.");
}

public static void method1() {
System.err.println("\tIn method1: calling method2.");
try {
method2();
} catch (FileNotFoundException e) {
System.err.println(e.toString());
}
System.err.println("\tIn method1: returned from method2.");
}
public static void method2() throws FileNotFoundException {
System.err.println("\t\tIn method2: calling method3.");
method3();
System.err.println("\t\tIn method2: returned from method3.");
}

public static void method3() throws FileNotFoundException {
System.err.println("\t\t\tIn method3: Entering.");

// Add code to throw an exception here.
// System.out.println(1/0);
  
BufferedReader in = new BufferedReader(new FileReader("products.ran"));
  
System.err.println("\t\t\tIn method3: Exiting.");
}
}

Answer 1

The code is as follows for mentioned tasks :

/**
*
* @author Sumit Jain
*/

// READ ALL THE COMMENTS WHERE YOU HAVE ASKED FOR YOUR QUERY

import java.io.*;

public class ExceptionTesterApp {

public static void main(String[] args) {
System.err.println("In main: calling Method1.");
Method1();
System.err.println("In main: returned from Method1.");
}

public static void Method1() {
System.err.println("\tIn Method1: calling Method2.");
Method2();
System.err.println("\tIn Method1: returned from Method2.");
}

public static void Method2() {
System.err.println("\t\tIn Method2: calling Method3.");
Method3();
System.err.println("\t\tIn Method2: returned from Method3.");
}

public static void Method3() {
System.err.println("\t\t\tIn Method3: Entering.");

// CODE ADDED IS HERE
int x = 0;
int y = 10;
  
// UNCHECKED EXCEPTION IS THROWN HERE
int z = y / x;

System.err.println("\t\t\tIn Method3: Exiting.");
}
}

out put :