//: c10:FullConstructors.java

// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

// Creates an exception class with two constructors:  a no-argument
// constructor and one that takes a string argument.  
// Throws two exceptions - one using each constructor - and calls
// the printStackTrace method (inherited from base class Exception) 
// for each MyException object created (i.e., thrown).
// In the case where the string-arg constructor was called, the string
// parameter passed to the constructor is also printed..

class MyException extends Exception 
{
  public MyException() 				// no-arg constructor
  {}			
  
  public MyException(String msg) 	// string-arg constructor
  {  
	  super(msg);					// calls base class constructor and
  }									// passes string parameter to it
}

public class FullConstructors 
{
  public static void f() throws MyException 
  {
      System.out.println( "Throwing MyException from f()" ) ;
      throw new MyException() ;		// call no-arg constructor
  }
  
  public static void g() throws MyException 
  {
      System.out.println("Throwing MyException from g()" ) ;
      // call string-arg constructor
      throw new MyException("Originated in g()") ;
  }
  
  public static void main(String[] args) 
  {
      try 
      {
      	  f() ;
      } 
      catch(MyException e) 
      {
      	  e.printStackTrace(System.err) ;
      }
    
      try 
      {
      	  g() ;
      } 
      catch(MyException e) 
      {
      	  e.printStackTrace(System.err) ;
      }
  }
} ///:~

/*  program output:

Throwing MyException from f()
MyException
        at FullConstructors.f(FullConstructors.java:26)
        at FullConstructors.main(FullConstructors.java:39)
Throwing MyException from g()
MyException: Originated in g()
        at FullConstructors.g(FullConstructors.java:33)
        at FullConstructors.main(FullConstructors.java:46)
*/