Java built-in exceptions

Built-in exceptions are the exceptions which are available in Java libraries. Java defines several exception classes in the standard java.lang package. The most general of these exceptions are subclasses of the standard type RuntimeException. Since java.lang is implicitly imported into all Java programs, most exceptions derived from RuntimeException are automatically available.

The following is the Example of Built in Exceptions

  • Arithmetic exception
  • ArrayIndexOutOfBounds Exception 
  • ClassNotFoundException
  • FileNotFoundException
  • IOException
  • InterruptedException 

 

Arithmetic exception Example

class ArithmeticExceptionDemo {

public static void main(String args[])

    {

        try {

            int a = 10, b = 0;

            int c = a / b; // cannot divide by zero

            System.out.println("Result = " + c);

        }

        catch (ArithmeticException e) {

            System.out.println("Can't divide a number by 0");

        }

    }

}

 

ArrayIndexOutOfBounds Exception  Example

class ArrayIndexOutOfBoundDemo {

public static void main(String args[])

    {

        try {

            int a[] = new int[3];

            a[7] = 9; // accessing 8th element in an array of

            // size 3

        }

        catch (ArrayIndexOutOfBoundsException e) {

            System.out.println("Array Index is Out Of Bounds");

        }

    }

}

 

Output

Array Index is Out Of Bounds

 

Java defines several other types of exceptions that relate to its various class libraries. Following is the list of Java Unchecked RuntimeException

Numbering exception class describe
1 ArithmeticException Arithmetic errors, e.g. dividing by zero.
2 ArrayIndexOutOfBoundsException Array index is out of range (out of bounds).
3 ArrayStoreException An array element of an incompatible type was allocated.
4 ClassCastException Invalid type conversion.
5 IllegalArgumentException A method was called with illegal parameters.
6 IllegalMonitorStateException Illegal watch operations, such as waiting for an unlocked thread.
7 IllegalStateException The environment or application is in an incorrect state.
8 IllegalThreadStateException The requested operation is not compatible with the current thread state.
9 IndexOutOfBoundsException An index of some type is out of range (out of bounds).
10 NegativeArraySizeException Create arrays with negative sizes.
11 NullPointerException Invalid use of a null reference.
12 NumberFormatException Invalid string converted to number format.
13 SecurityException Attempt to violate security regulations.
14 StringIndexOutOfBounds An attempt was made to index outside the bounds of the string.
15 UnsupportedOperationException An unsupported operation was encountered.

Following is the list of Java checked exceptions defined in java.lang 

Numbering exception class describe
1 ClassNotFoundException class not found exception
2 CloneNotSupportedException Attempt to clone an object that does not implement the Cloneable interface.
3 IllegalAccessException Access Denied class exception.
4 InstantiationException Attempting to create an object of an abstract class or interface exception.
5 InterruptedException A thread is interrupted by another thread.
6 NoSuchFieldException The requested field does not exist.
7 NoSuchMethodException The requested method does not exist.

 

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