1. TRY CATCH BLOCK
By Kosala Rajapaksha

2. Program Errors Syntax Exceptions Logical Errors Errors
By Kosala Rajapaksha

3. Syntax Errors(Compile Time Errors)
Generated because of an invalid syntax. Compiler shows those. Program never compile.
Exceptions(Run Time Errors)
These type of errors generated while program is running. Compiler can’t detect those. So program is successfully compiled.
Logical Errors(Semantic Errors)
The program is compiled and run. But it generate unexpected results because of invalid logics. Also known as bugs.
By Kosala Rajapaksha

4. Try Catch Block is used to handle Exceptions.{
//statements which can generate Exceptions. }
catch(Exception x)
//statements to process the exception.
By Kosala Rajapaksha

5. Example public class Divide { public static void main(String[] ar)
int x=10;
int y=0;
try
int z=x/y;
System.out.println(z); }
catch(ArithmeticException ex)
System.out.println(“devide by 0”);
By Kosala Rajapaksha

6. Ex:-ArithmeticException ArrayIndexOutOfBoundsException
Exception Types
There are inbuilt child classes inherited from the Exception base class to catch specified exceptions.
Ex:-ArithmeticException
ArrayIndexOutOfBoundsException
NumberFormatException
NullPointerException
ClassNotFoundException
IOException
FileNotFoundException
You can declare your own Exception class inherited from Exception
Class.
By Kosala Rajapaksha

7. Concern
There can be multiple catch statements with a single try block.
Can’t be a catch without a try.
Propagate the exception is also another method to handle it. But this is not a good technique.
By Kosala Rajapaksha

8. Finally Block
Placed after the try catch block. The code inside will execute either exception generate or not.
public void Method1{
Try {
// some code(Possible to generate an exception) }
Catch(Exception x) {
// some code(Process the exception)
Finally
//this code will be executed whether or not an exception
is thrown or caught
By Kosala Rajapaksha

9. THANK YOU