Repeat Programming Project 4 of Chapter 10, but write it as an applet.

Question

The first step is to design the user interface with appropriate buttons, labels, and text boxes and a good next step to write and test just the code to create them. After that, the action events such as opening a file to read, reading records, opening a file to write, writing records, etc., can be developed one at a time. Care must be taken to keep track of whether a file is open or not, and, if a file is open, whether it is a read file or a write file, so a character flag variable readOrWrite is used and assigned an appropriate value depending on the action taken. Another design issue to consider is how to display error messages. One alternative is to use pop-up windows, but the solution shown here takes a simpler approach by writing the messages to the text field at the top of the window.

Answer 1

See the code in SpeciesFileReadOrWriteAppket.java.