Checked Exceptions

Checked exceptions are the objects of the Exception class or any of its subclasses excluding the Runtime Exception class. Checked Exceptions are the invalid conditions that occur in a java program due to invalid user input, network connectivity problem or database problems.

Java uses the try-catch block to handle the checked exceptions. The statements within a program that throw an exception are placed in the try block. You associate an exception-handler with the try block by providing one or more catch handlers immediately after the try block.Various checked exceptions defined in the java.lang.package are,

1.        ClassNotFoundException

2.        IllegalAccessException

3.        InstantiationException

4.        NoSuchMethodException

5.        IOException

Unchecked Exceptions

Unchecked exceptions are the run-time errors that occur because of programming errors, such as invalid arguments passed to a public method. The java complier does not check the unchecked exceptions during program compilation.Various Unchecked Exceptions are,

1.        ArithmeticException

2.        ArrayIndexOutOfBoundsException

3.        ArrayStoreException

4.        ClassCastException

5.        IllegalArgumentException

6.        NegativeArraySizeException

7.        NullPointerException

8.        NumberFormatException