Line number 11.
Although your source code is translated from text into bytecodes,
and it is the bytecodes that are executed by the Java virtual machine,
the file of bytecodes EchoSquare.class
retains some line number information which is displayed when your program crashes.
Here is another example. It asks the user for two integers which are then added together and the sum written out.
import java.util.Scanner; class AddTwo { public static void main (String[] args) { Scanner scan = new Scanner( System.in ); int first, second, sum ; // declaration of int variables System.out.println("Enter first integer:"); first = scan.nextInt(); // read chars and convert to int System.out.println("Enter second integer:"); second = scan.nextInt(); // read chars and convert to int sum = first + second; // add the two ints, put result in sum System.out.println("The sum of " + first + " plus " + second +" is " + sum ); } }
Here is a sample run:
Enter first integer: 12 Enter second integer: -8 The sum of 12 plus -8 is 4
(A slightly hard question: ) explain what happened in the following run of the same program:
Enter first integer: 12 -8 Enter second integer: The sum of 12 plus -8 is 4