not even getting this to compile and I am completely lost.

Question about the task

Under discussion

I thought I understood what was being asked of me but apparently, I haven't a clue. I don't even know where to begin asking questions. I'm sorry for the vagueness and I hope there is somewhere someone can start with helping me solve this. Thanks in advance!

package com.codegym.task.task09.task0917;

/*
Catching unchecked exceptions

*/

public class Solution {
    public static void main(String[] args) {
        handleExceptions(new Solution());
    }

    public static void handleExceptions(Solution obj) {
        try {
            obj.method1();
            obj.method2();
            obj.method3();
        }
        catch (NumberFormatException e) {
            printStack(e);
        }
        catch (IndexOutOfBoundsException e) {
            printStack(e);
        }
        catch(NullPointerException e) {
            printStack(e);
        }


    }

    public static void printStack(Throwable throwable) {
        System.out.println(throwable);
        for (StackTraceElement element : throwable.getStackTrace()) {
            System.out.println(element);
        }
    }

    public void method1() {
        throw new NullPointerException();
    }

    public void method2() {
        throw new IndexOutOfBoundsException();
    }

    public void method3() {
        throw new NumberFormatException();
    }
}

Comments (9)

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Almaz Temirkanov

Level 24 , Bishkek, Kyrgyzstan

18 July 2019, 11:21

try { obj.method1(); obj.method2(); obj.method3(); } catch (RuntimeException r) { printStack(r); }

Deepak Chandra

Level 16 , Visakhapatnam, India

17 July 2019, 13:34

Hey buddy you have to use only one try- catch block instead of catching induvidual exceptions like this

try {
           obj.method1();
           obj.method2();
           obj.method3();
       }
       catch (NumberFormatException e) {
           printStack(e);
       }
       catch (IndexOutOfBoundsException e) {
           printStack(e);
       }
       catch(NullPointerException e) {
           printStack(e);
       }

you can catch a single Exception which equals catching all other Exceptions like this

try {
           obj.method1();
           obj.method2();
           obj.method3();
       }
       catch (Exception e){
           printStack(e);
       }

Note : Since all the exceptions inherit from a Single Exception Class hence you can catch all exceptions using Exception class. And read conditions perfectly since condition 4 says that you should usy only one try-catch block but you are using one try block and three catch block's

Jason

Level 26 , Rancho Cucamonga, United States

17 July 2019, 23:40

java.lang.NullPointerException com.codegym.task.task09.task0917.Solution.method1(Solution.java:35) com.codegym.task.task09.task0917.Solution.handleExceptions(Solution.java:15) com.codegym.task.task09.task0917.Solution.main(Solution.java:10) Process finished with exit code 0 That is the result with that code and the other code. It comes out the same^^^^

Jason

Level 26 , Rancho Cucamonga, United States

17 July 2019, 23:41

package com.codegym.task.task09.task0917;

/*
Catching unchecked exceptions

*/

public class Solution {
    public static void main(String[] args) {
        handleExceptions(new Solution());
    }

    public static void handleExceptions(Solution obj) {
        try {
            obj.method1();
            obj.method2();
            obj.method3();
        }
        catch (Exception e) {
            printStack(e);
        }



    }

    public static void printStack(Throwable throwable) {
        System.out.println(throwable);
        for (StackTraceElement element : throwable.getStackTrace()) {
            System.out.println(element);
        }
    }

    public void method1() {
        throw new NullPointerException();
    }

    public void method2() {
        throw new IndexOutOfBoundsException();
    }

    public void method3() {
        throw new NumberFormatException();
    }
}

Deepak Chandra

Level 16 , Visakhapatnam, India

18 July 2019, 04:03

Ok now i get it try this And iam sure your task is done now

int i = 1;
       while(i <= 3)
       {
           try{
           if (i == 1)
                obj.method1();
           else if (i == 2)
                 obj.method2();
           else if (i == 3)
                   obj.method3();
           }
           catch(Exception ex)
           {
             ex.printStackTrace();
           }
           i++;
       }

Jason

Level 26 , Rancho Cucamonga, United States

7 August 2019, 09:15

Hey! it looks like you got it figured out. Sorry, I just now noticed the notification. :/ but thank you for posting your results once you got it figured out. : )

Almaz Temirkanov

Level 24 , Bishkek, Kyrgyzstan

17 July 2019, 08:09

1 catch method use RuntimeException

Jason

Level 26 , Rancho Cucamonga, United States

18 July 2019, 00:06

Tried it. It's still not working look at the comments above I posted when I tried with Exception and then Tried RunTimeException as well to no avail. :/

prathameshbagekari

Level 17 , Mumbai, India

2 August 2019, 15:21

public static void main(String[] args) throws Exception {
        handleExceptions(new Solution());
    }

    public static void handleExceptions(Solution obj) throws Exception {
        try {
            obj.method1();
            obj.method2();
            obj.method3();
        }
        catch (Exception e) {
            printStack(e);
        }

Try the above code block or I think the below one should work too..Please tell me about the below one..

public static void main(String[] args) throws Exception{
        try {
            handleExceptions(new Solution());
        }
        catch (Exception e)
        {
            printstack(e);
        }
    }

    public static void handleExceptions(Solution obj) {
            obj.method1();
            obj.method2();
            obj.method3();
    }