Is NullPointerException a compile time error?

NullPointerException is a RuntimeException . Runtime exceptions are critical and cannot be caught at compile time. They crash the program at run time if they are not handled properly.

What are null pointer exceptions?

NullPointerException s are exceptions that occur when you try to use a reference that points to no location in memory (null) as though it were referencing an object. Calling a method on a null reference or trying to access a field of a null reference will trigger a NullPointerException .

Why is a NullPointerException an unchecked exception?

It’s not a checked exception (among other things) because it is extremely common. It can occur pretty much everywhere. If it were checked, then nearly every single method in every single Java program anywhere would have to declare that it throws NullPointerException .

What are runtime exceptions?

The Runtime Exception is the parent class in all exceptions of the Java programming language that are expected to crash or break down the program or application when they occur. It should be noted that when a program is running out of memory, a program error is thrown instead of showing it as a Runtime Exception.

Is RuntimeException subclass of exception?

RuntimeException is the superclass of those exceptions that can be thrown during the normal operation of the Java Virtual Machine. RuntimeException and its subclasses are unchecked exceptions.

Is ArrayIndexOutOfBoundsException a runtime exception?

If a request for a negative or an index greater than or equal to the size of the array is made, then the JAVA throws an ArrayIndexOutOfBounds Exception. The ArrayIndexOutOfBoundsException is a Runtime Exception thrown only at runtime. The Java Compiler does not check for this error during the compilation of a program.

What is a runtime exception Java?

RuntimeException is the superclass of those exceptions that can be thrown during the normal operation of the Java Virtual Machine. A method is not required to declare in its throws clause any subclasses of RuntimeException that might be thrown during the execution of the method but not caught.

Are runtime exceptions throwable?

Both Exception and Error classes are derived from class Throwable (which derives from the class Object ). And the class RuntimeException is derived from class Exception .