What is the number exception in Java?

What is the number exception in Java?

I'm happy to help you with that!

In Java, an exception is a situation where something unexpected happens while your program is running. This "something" can be anything from a missing file to a piece of code not working as expected.

Let's dive deeper! There are two types of exceptions in Java: checked and unchecked.

When you catch these exceptions, you should either fix the issue or rethrow the exception to let it bubble up the call stack.

You can still catch these exceptions if you want to handle them in some way, but you don't have to.

Now, let's talk about the most popular exception class in Java: RuntimeException. This is a subclass of Exception and has an unchecked type. It's often used for programming errors like null pointer or invalid logic.

Some other important exceptions in Java include:

Exceptions can be thrown by methods using the throw keyword. You can also create custom exception classes if needed.

Handling exceptions is crucial in Java programming. When an exception occurs, it's like hitting a speed bump on the road – you need to slow down and deal with the issue before continuing. You can either catch and handle the exception or let it propagate up the call stack until it reaches a main method that handles it.

In summary, exceptions are situations where something unexpected happens in your Java program. There are checked and unchecked types of exceptions, with RuntimeException being a popular subclass. Understanding how to throw and handle exceptions is vital for writing robust and reliable code in Java!

How many exceptions are there in java with examples

I'd be happy to provide you with the information you're looking for.

In Java, an exception is an event that occurs during the execution of a program and disrupts the normal flow of instructions. Exceptions can be thrown by the programmer or caught by the programming language itself.

Here are some examples of exceptions in Java:

Example:

    try {
int result = 10 / 0; // Division by zero
} catch (ArithmeticException e) {
System.out.println("Error: " + e.getMessage());
}

Example:

    try {
int[] arr = {1, 2, 3};
System.out.println(arr[-1]); // Array index out of bounds
} catch (ArrayIndexOutOfBoundsException e) {
System.out.println("Error: " + e.getMessage());
}

Example:

    try {
Class.forName("com.example.MyClass"); // MyClass not found
} catch (ClassNotFoundException e) {
System.out.println("Error: " + e.getMessage());
}

Example:

    try {
FileWriter fw = new FileWriter("test.txt"); // File not found
} catch (IOException e) {
System.out.println("Error: " + e.getMessage());
}

Example:

    try {
String str = null;
System.out.println(str.length()); // Null pointer
} catch (NullPointerException e) {
System.out.println("Error: " + e.getMessage());
}

Example:

    try {
AccessController.checkPermission(new Permission()); // Permission denied
} catch (SecurityException e) {
System.out.println("Error: " + e.getMessage());
}

Example:

    try {
String str = "Hello";
char c = str.charAt(-1); // String index out of bounds
} catch (StringIndexOutOfBoundsException e) {
System.out.println("Error: " + e.getMessage());
}

Example:

    try {
Thread.sleep(1000); // Sleep timeout
} catch (InterruptedException e) {
System.out.println("Error: " + e.getMessage());
}

Example:

    try {
InetAddress addr = InetAddress.getByName("unknownhost"); // Unknown host
} catch (UnknownHostException e) {
System.out.println("Error: " + e.getMessage());
}

Example:

    try {
int num = Integer.parseInt("abc"); // Invalid number
} catch (NumberFormatException e) {
System.out.println("Error: " + e.getMessage());
}

And many more. There are 39 built-in exceptions in Java.

Java provides several mechanisms for handling exceptions, including:

Remember, exceptions should be used sparingly and only for exceptional situations that cannot be handled normally by the program.