Handling exceptions.

In java we use try catch to handle exception. In try we write the code which we think can/might cause the exception and in catch we write the solution to fix if the exception occurs.

class TryCatchTest{
 
 public static void main(String[] args){
  try{
   double value = Double.parseDouble(args[0]);
   double result = Math.sqrt(value);
   System.out.printf("Square-root of %f is %f%n", 
                        value, result);
  }catch(ArrayIndexOutOfBoundsException e){
   System.out.println("USAGE: java TryCatchTest number");
  }catch(Exception e){
   System.out.printf("ERROR: %s!%n", e);
  } 
  System.out.println("Done!");
 }
}

To compile:

javac TryCatchTest.java

To run:

java TryCatchTest