Java Exception Handling - 1

Explanation
In the hierarchy of Exceptions, it all starts with Object class (which is a superclass of all classes), and the follows Throwable class.

Explanation
Checked Exception - the name itself suggests it is checked by the Java compiler!! You can not move ahead with execution of your program if you have these exceptions in your coding.

Explanation
When a statement tries to divide by zero, the exception thrown is ArithmeticException. This exception occurs when an arithmetic operation in Java has an illegal or undefined result, such as division by zero. In this case, since the statement is attempting to divide by zero, it will throw an ArithmeticException.

Explanation
An instance of "Error" describes system errors. If this type of error occurs, there is little you can do beyond notifying the user and trying to terminate the program gracefully. Errors are typically caused by serious problems that cannot be easily recovered from, such as out of memory errors or stack overflow errors. They are not meant to be caught and handled like exceptions, but rather indicate a severe problem that may require intervention from the developer or system administrator.

Explanation
In Java, there are two main types of exceptions that should ideally be dealt with in a program: Checked Exceptions and Runtime Exceptions. Checked Exceptions are the exceptions that are checked at compile-time and are required to be handled or declared in the method signature. They are typically used to handle anticipated errors or exceptional conditions that can occur during the execution of a program. Runtime Exceptions, on the other hand, are not checked at compile-time and do not require explicit handling. They are usually caused by programming errors or unexpected conditions that may occur during the runtime of a program. Therefore, it is important to handle both types of exceptions to ensure proper error handling and program stability.

Explanation
Try blocks must have at least one corresponding catch block in Java language because try blocks are used to enclose the code that may throw an exception, and the catch block is used to handle the exception that is thrown. Without a catch block, the code would not be able to handle the exception and would result in a compilation error. Therefore, it is necessary to have a catch block for every try block to handle the potential exceptions.