HANDLING EXCEPTIONS AND EVENTS - Java Programming: From Problem Analysis to Program Design - page 774

this .addWindowListener( new WindowAdapter()
{

public void windowClosing(WindowEvent e)
{

System.exit(0);

}

}

);

setVisible( true );

}

//Place the definition of the method actionPerformed
//as described here

//Place the definition of the method evaluate
//as described here

public static void main(String[] args)
{

Calculator C = new Calculator();

}

}

Sample Run 1: In this sample run (see Figure 11-9), the user entered the numbers
34 and 25 , the operation + , and = . The result is shown in the bottom screen.

FIGURE 11-9 Adding numbers 34 and 25

Sample Run 2: In this sample run (see Figure 11-10), the user attempted to divide
by 0 , resulting in an error message.