Exception Handling in C++ and Java

Exception Handling in JAVA:

Exception handling in Java is the method to handle the run-time error and is the most efficient method to handle an exception. There are various types of errors that generally occurs during execution. Some are ClassNotFoundException, IOException, SQLException, RemoteException, etc.

Java's exception handling contains the same three keywords try, throw, and catch. And their functioning is the same as it is in C++.

Now we will see some differences between exception handling in C++ and Java.

Fibonacci Series in C++

Difference between C++ and Java exception handling:

Following are the differences between exception handling in C++ and Java: 

These are some differences between exception handling in C++ and Java.

Now we will understand the exception handling through code both in C++ and Java.

Exception handling in C++

Code:

#include <iostream>
using namespace std;
int main()
{
int temp = 0;
try {
if (temp < 1) {
throw temp;
}
}
catch (int temp) {
cout << "Exception occurred at value " << temp << endl;
}
getchar();
return 0;
}

You can also try this code with Online C++ Compiler

Run Code

Output for the given code is

And, as one of the differences mentioned, any type of exception can be thrown; this wouldn't work on Java.

Now, let's have a look at the catch-all block in C++:

Code:

#include <iostream>
using namespace std;
int main()
{
int temp = 0;
char* ptr;
ptr = new char[256];
try {
if (temp < 1) {
throw temp;
}
if (ptr == NULL) {
throw " ptr is NULL ";
}
}
catch (...) 
{
cout << "Exception occurred" << endl;
exit(0);
}
getchar();
return 0;
}

You can also try this code with Online C++ Compiler

Run Code

The output of the above code is 

Now let's have a look at exception handling in Java.

Exception Handling in Java

Code:

class Test extends Exception {
}
class Main {
public static void main(String args[])
{
try {
throw new Test();
}
catch (Test t) {
System.out.println("Test exception");
}
finally {
System.out.println("Inside finally block ");
}
}
}

You can also try this code with Online Java Compiler

Run Code

Output for the above Java program that contains the finally block.

These were some exception handling examples in Java and C++. Try and compile with online c++ compiler.

Let us see some frequently asked questions related to the topic.

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FAQs:

1. What is an exception?
   An exception is an unexpected event that occurs during the execution of a program that is at run-time.
2. What is an error?
   Error is irrecoverable. Some example of errors are OutOfMemoryError, VirtualMachineError, AssertionError etc.
3. What is exception handling?
   Exception Handling is a way to handle run-time errors so that the remaining code works correctly.
4. What is the finally block?
   Java finally blocks a block used to execute necessary code, such as closing the connection.
5. What are the keywords for handling an exception in Java?
   Keywords that we generally use are Try, Throw, and Catch. But we often use finally and throws accordingly.

Let us summarize the article.

Key Takeaways:

In this article, we have extensively discussed exception handling in C++ and Java. At first, we have seen some brief explanations about exception handling in C++ and Java separately. Then we discussed differences between them. And at last some programs as an example of exception handling.

C++ vs Java

Also check out this article - Pair in C++

Ninjas! Do not stop here. Learn more about Exception Handling.

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