Just Java™ 2

Exercises

1. Take the MyFrame program that demonstrates the thread bug and update it to reproduce the race condition more easily. Change the arithmetic that updates variable i into two statements, and put a sleep() or a yield() statement between them. Observe the failure.

2. Update the MyFrame program to remove the race condition by making the reading and writing of the variables mutually exclude each other. Test your code by running it on a version of the program that quickly reproduces the race condition failure.

3. Write a small Java program to capture the screen, display it in a scroll panel inside a frame, and allow the user to trim its size. Write the cropped region to a file on request. Allow the user to choose any output file format ...