exception throw and catch in java, python 3, c++ and javascript

 Here is how you can throw and catch an exception in each of the languages you mentioned:

Java:

import java.io.IOException; 
public class Main { 
    public static void main(String[] args) { 
        try { 
            throw new IOException("An IOException occurred"); 
        } catch (IOException e) { 
            System.out.println("Caught IOException: " + e.getMessage()); 
        } 
    } 
}

Python 3:

try: 
    raise IOError("An IOError occurred") 
except IOError as e: 
    print(f'Caught IOError: {e}')

C++:

#include <iostream> 
#include <stdexcept> 
int main() { 
    try { 
        throw std::runtime_error("A runtime error occurred"); 
     } catch (const std::exception& e) { 
        std::cout << "Caught runtime error: " << e.what() << std::endl; 
    } 
    return 0; 
}

JavaScript:

try { 
    throw new Error("An error occurred"); 
} catch (e) { 
    console.log(`Caught error: ${e.message}`); 
}

I hope this helps! Let me know if you have any questions.