Why i'm getting this output in exception handling in Java

Question

Can anybody explain to me what is happening here? Output I'm getting is

generic exception caught

public class TestingString {
    static void testCode() throws MyOwnException {
        try {
            throw new MyOwnException("test exception");
        } catch (Exception ex) {
            System.out.print(" generic exception caught ");
        }
    }
    public static void main(String[] args) {
        try {
            testCode();
        } catch (MyOwnException ex) {
            System.out.print("custom exception handling");
        }
    }

}

class MyOwnException extends Exception {
    public MyOwnException(String msg) {
        super(msg);
    }
}

You throw it then immediately catch it. Not sure what you're struggling with. — Dawood ibn Kareem, Dec 15 '18 at 06:35
The output you are receiving is correct. What output are you expecting and why? — Nicholas K, Dec 15 '18 at 07:15

score 1 · Answer 1 · answered Dec 15 '18 at 06:53

1

You throw the MyOwnException object in the testCode() method, which is caught immediately by catch (Exception ex) that is the reason why System.out.print(" generic exception caught "); is excuted , which finally leads to the output.

answered Dec 15 '18 at 06:53

ZhaoGang

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elbraulio · Accepted Answer · 2018-12-15T14:45:31.273

if you want to get the output custom exception handling. You have to throw the exception in testCode like this

public class TestingString {
    static void testCode() throws MyOwnException {
        try {
            throw new MyOwnException("test exception");
        } catch (Exception ex) {
            System.out.print(" generic exception caught ");
            // throw the exception!
            throw ex;
        }
    }
    public static void main(String[] args) {
        try {
            testCode();
        } catch (MyOwnException ex) {
           System.out.print("custom exception handling");
        }
    }
}

class MyOwnException extends Exception {
    public MyOwnException(String msg) {
        super(msg);
    }
}

when you catch the exception you can throw it again. In your original code you are not re-throwing the exception, that is why you only got one message.

After you've changed the exception catches, the message is no longer `"generic exception caught"` — Andrew Tobilko, Dec 15 '18 at 09:54

Why i'm getting this output in exception handling in Java

2 Answers2