Throwable Class Example in Java

The Throwable class provides the following commonly used methods.

• String getMessage (): It returns the description of the exception. It includes fully qualified name of the Exception class and a brief description of the exception.

•  void printStackTrace(): Prints the Throwable object and its stack trace information on the console.

• String toString (): It returns the String object containing a description of the exception. This description includes the full name of the Exception class followed by comma and a space and the string returned from the getMessage () method.

• StackTraceElement [] getStackTrace(): It returns an array that contains the stack trace, one element at a time as an array of stack trace elements. The method at the top of the stack is the last method called before the exception was thrown.

• void printStackTrace (PrintStream s): This is same as printStackTrace () method except that you specify the output stream as an argument.

• Throwable fillInStackTrace (): It returns a Throwable object that contains a completed stack trace. This object can be rethrown.

The following program demonstrates the use of Throwable methods to display exception information when an exception is thrown.

public class ThrowableMethods 
 { 
        static void A() 
        { 
          int x = 12 ; 
          int y = 0 ; 
          int z = x/y; 
        } 
        public static void main(String[] args) 
        { 
             try 
             { 
                 A(); 
              } 
              catch(ArithmeticException e) 
             {  
                     System.out.println("Displaying stack trace information..."); 
                     e.printStackTrace(); 
                     System.out.println("\nDescription of the exception : "+e.getMessage()); 
                     System.out.println("\nString containong Description of the exception"); 
                     System.out.println(e.toString()); 
              } 
         } 
 }