what is wrong with his-declared two checked and two unchecked but still not verifying

Question about the task

We're all friends here, even the exceptions

Under discussion

package com.codegym.task.task09.task0918; /* We're all friends here, even the exceptions */ import java.io.*; public class Solution { public static void main(String[] args) { } static class MyException extends Exception { public void test(){ try{ int a=10; int b=0; int c=a/b; } catch(ArithmeticException e){ } } } static class MyException2 extends Exception { public void test1(){ try{ String arr[]={"1","2","3"}; String s=arr[4]; }catch(ArrayIndexOutOfBoundsException e1){ } } } static class MyException3 extends Exception{ public static void method1() throws FileNotFoundException { //Throws FileNotFoundException if the file doesn't exist FileInputStream fis = new FileInputStream("C2:\badFileName.txt"); } } static class MyException4 extends Exception { public void test3() throws IOException { FileInputStream fis = null; fis = new FileInputStream("B:/myfile.txt"); int k; while(( k = fis.read() ) != -1) { System.out.print((char)k); } fis.close(); } } }

There are four classes: MyException, MyException2, MyException3, and MyException4.
Inherit the classes so that you get any two checked exceptions and any two unchecked exceptions.

Hint:
Carefully study the Exception1, Exception2, and Exception3 classes from the second task in this lesson.

Requirements:

The Solution class must have 4 nested classes: MyException, MyException2, MyException3, and MyException4.
All the nested classes must inherit exception classes.
Two of the four classes must be checked exceptions.
Two of the four classes must be unchecked exceptions.

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Sela

Level 20 , Poland

6 July 2020, 12:37

Ankush Rajput is right. just extend the methods leaving empty body. which is check, which unchecked is depicted below:

hidden #10574078

Level 10

28 December 2019, 10:32

https://www.baeldung.com/java-checked-unchecked-exceptions Check out this link. The exception is separated into two categories: the checked and the unchecked one. The superclass of the checkend one is Exception while the unchecked one is the Runtime Exception.

Kisszol

Level 15 , Toeroekbalint, Hungary

27 March 2019, 08:41

Esperanto: Gxi estas tre malfacila ekzerco, sed mi solvis (poste du horoj): public static void method1() throws MyException, MyException2, MyException3, MyException4 { int i = (int) (Math.random() * 4); if (i == 0) throw new MyException(); if (i == 1) throw new MyException2(); if (i == 2) throw new MyException3(); if (i == 3) throw new MyException4(); ; } static class MyException extends Exception { } static class MyException2 extends MyException { } static class MyException3 extends RuntimeException { //RuntimeException() } static class MyException4 extends MyException3 { }

Ankush Rajput

Level 25 , Bhopal, India

21 October 2018, 16:52

Question only requires two classes to be Checked Exception and two classes to be Unchecked Exception. No need to calculate or display or throw anything. For how to solve this, first look into two classes - Exception class and Runtime Exception class. If any class extends Exception class, it will be checked and if any class extends RuntimeException class, it will be unchecked. So, inherit one class from Exception and one from RuntimeException and then nest remaining two as per requirements.

+13

Tayyab Mubeen

Level 16 , Lahore, Pakistan

21 October 2018, 12:59

am also stuck in this task..!!! https://codegym.cc/help/827

Learner

Level 16 , India

10 October 2018, 05:16

1. You have to make the classes nested. For example: class MyException 2 extends MyException 2. Two classes must be Checked Exception while two must be Unchecked. Checked exceptions are checked during compile time while Unchecked exceptions are not checked during compile. For example; 10/0 will compile fine but will throw an ArithmeticException during run time only. This is unchecked exception. While for Checked exception, when you use FileReader, your code will not compile until you declare FileNotFoundException in the code because FileReader() throws this Checked Exception.