Substring Theory

[sub]STRING THEORY

An Extra Credit Assignment, created by 2 FCPS Students

Capture user input and display it on the screen. The user will be able to delete their typing with backspace, store it with enter, and manipulate it with keywords.

Part A

Create a program that displays the letters that you type. Also, if you press the Backspace key, it will delete the last letter input.

• To store the user’s input, you will need to create a String variable and use the key and keyPressed methods, as well as concatenation.
• The program should NOT display spaces or weird symbols when a key that isn’t a letter or number is pressed. To do this, you will have to use keyCode.
• To use backspace, you will have to use the substring command.

Part B

If the user presses the ENTER key, the current text input will be stored on the screen. Up to three lines may be stored at any given time. If a fourth line is stored, the first line disappears.

• To store the lines, three new String variables should be created.
• When ENTER is pressed, the current input should be stored to the first available line. Otherwise, it gets stored to the bottom and the other lines get bumped up.

Part C

If the user types in a certain keyword, it will change the display.

• At least three keywords must be created.
• For example, typing the word blue will make the text change to the color blue.
• This should stay in effect until another keyword is entered, NOT when the keyword disappears from the screen.
• Both the user’s text and the stored text will be affected by the change.