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Exception handler in Java

EXCEPTION HANDLER IN JAVA


Excepiton: In Java, an exception is an event that disrupts the normal flow of the program. It is an object which is thrown at runtime.

Exception hadnling: The Exception Handling in Java is one of the powerful mechanism to handle the runtime errors so that normal flow of the application can be maintained.

Exception Handling is a mechanism to handle runtime errors such as ClassNotFoundException, IOException, SQLException, RemoteException, etc.

Example for exception handling in Java:

public class JavaExceptionExample{
  public static void main(String args[])
  {
   int a = 10;
   try
   {
      int z= a/0;
   }

   catch(ArithmeticException e)
   {
       System.out.println(e);}
   }
  }

Types of Java Exceptions:

  1. Checked Exception
  2. Unchecked Exception
1. Checked Exception: The classes which directly inherit Throwable class except RuntimeException and Error are known as checked exceptions e.g. IOException.. 
Checked exceptions are checked at compile-time.

2. Unchecked Exception: The classes which inherit RuntimeException are known as unchecked exceptions e.g. ArithmeticException, ArrayIndexOutOfBoundsException etc. Unchecked exceptions are not checked at compile-time, but they are checked at runtime.

Java exception keywords:
  1. try
  2. catch
  3. fanally
  4. throw
  5. throws

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