Objective: To use the e.printStackTrace() method to aide in locating the source of errors.

	Java keeps track of the program by managing a stack in memory containing all processes going on in your program. The *e.printStackTrace() method can then be very useful. In this exercise, you will see how to use _e.printStackTrace(); to print out the stack history.

The stack trace is a very simple statement.

e.printStackTrace();

Follow this with the name of the program: StackTrace.

Use good comments in the body of the program.

Insert the e.printStackTrace() in each catch block of the try-catch framework.

Cause the program to catch an exception (of the type that the try-catch is set up for.).

You should see a listing of the lines executed just prior to the exception. It should look similar to the list below:

at java.util.Scanner.throwFor(Scanner.java:840)

at java.util.Scanner.next(Scanner.java:1461)

at java.util.Scanner.nextInt(Scanner.java:2091)

at java.util.Scanner.nextInt(Scanner.java:2050)

at C8PATryCatch.getInt(C8PATryCatch.java:26)

at C8PATryCatch.main(C8PATryCatch.java:14)

The program to use is below

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import javax.swing.JOptionPane;

public class StackTrace

{

public static void main(String[] args)

{

try

{

Divison divison = new Divison();

int firstNum = Integer.parseInt(JOptionPane.showInputDialog("Enter the first Number:"));

int secondNum = Integer.parseInt(JOptionPane.showInputDialog("Enter the second Number:"));

divison.setFirstNum(firstNum);

divison.setSecondNum(secondNum);

JOptionPane.showMessageDialog(null, divison);

}

catch (Exception e)

{

}

}

}

class Divison

{

//division setup

private int firstNum;

private int secondNum;

public Divison()

{

this.firstNum = 0;

this.secondNum = 1;

}

public Divison(int firstNum, int secondNum)

{

this.firstNum = firstNum;

this.secondNum = secondNum;

}

//return firstNum

public int getFirstNum()

{

return firstNum;

}

//return secondNum

public int getSecondNum()

{

return secondNum;

}

//set firstNum

public void setFirstNum(int firstNum)

{

this.firstNum = firstNum;

}

//set secondNum

public void setSecondNum(int secondNum)

{

this.secondNum = secondNum;

}

public double getDivison()

//math w/ if-else and try-catch

{

if (getSecondNum() != 0)

{

return (double) getFirstNum() / (double) getSecondNum();

}

else

{

try

{

throw new ArithmeticException("Cannot be zero");

} catch (ArithmeticException e)

{

System.out.println(e.getMessage());

}

}

return 0;

}

@Override

public String toString()

//solution output

{

return getFirstNum() + " Divided By " + getSecondNum()

+ " Equals: " + getDivison();

}

}