HANDLING EXCEPTIONS AND EVENTS - Java Programming: From Problem Analysis to Program Design - page 754

public static void methodA() throws Exception
{

methodB();

}

public static void methodB() throws Exception
{

methodC();

}

public static void methodC() throws Exception
{

throw new Exception("Exception generated in method C");

}

}

Sample Run:
java.lang.Exception: Exception generated in method C caught in main
java.lang.Exception: Exception generated in method C
at PrintStackTraceExample1.methodC(PrintStackTraceExample1.java:30)
at PrintStackTraceExample1.methodB(PrintStackTraceExample1.java:25)
at PrintStackTraceExample1.methodA(PrintStackTraceExample1.java:20)
at PrintStackTraceExample1.main(PrintStackTraceExample1.java:9)
The preceding program contains the methods methodA , methodB , methodC ,and main .The
method methodC creates and throws an object of the class Exception .Themethod
methodB calls methodC , methodA calls methodB , and the method main calls methodA .
Because the methods methodA and methodB do not handle the exception thrown by
methodC , they contain the throws Exception clause in their heading. The method main
handles the exception thrown by methodC , which was propagated first by methodB and then
by methodA .The catch block in the method main first outputs the message contained in the
exception object and the string " caught in main" , then it calls the method
printStackTrace to trace the method calls (see the last four lines of the output).

The program in Example 11-10 is similar to the program in Example 11-9. The main
difference is that the exception thrown by methodC is caught and handled in methodA .
Note that the heading of methodA does not contain any throws clause.

EXAMPLE 11-10

import java.io.*;

public class PrintStackTraceExample2
{

public static void main(String[] args)
{

methodA();

}