Lecture 14

Computer Science 252
Problem Solving with Java

Fall 2015, The College of Saint Rose

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Lecture 14: More Interfaces; Java Swing
Date: Tuesday, October 20, 2015

Agenda

Announcements
Lab 7: Bubble Blower is on the late clock
Lab 8: Furious Fowl continues
Lecture 13 assignment recap
Handling arrow keys - using a Java interface
Introduction to Swing components
In-class Exercise 14 - (10 lecture assignment points) due before the end of class.
Go way back in time to an example such as Scribble or SpiralLines and add at least 2 Java Swing components. For example, you might choose to add a "Clear" JButton that will clear the canvas, and a JComboBox select from among several colors to use for the next created scribble.

Please demonstrate your program or submit only the file you modify by email before you leave class. Email submissions should use a meaningful subject line, clearly indicating the course number and assignment name.

Due at the start of class, Thursday, October 22.

Please submit answers to these questions either as a hard copy (typeset or handwritten are OK) or by email to terescoj AT strose.edu by the start of class. Please use a clear subject line when submitting by email (e.g., CSC 252 Lecture 14 Assignment , Joe Student). We will discuss these questions at the start of class, so no late submissions are accepted.

Which operations must be supported by an Objectdraw object in order for it to be draggable? (3 points)
Write a Java interface called Draggable that includes those needed methods. (3 points)
Suppose your WindowController class has an instance variable of type Draggable and its begin method assigns that variable to refer to some object that implements the Draggable interface. Write the onMousePress, onMouseDrag, and onMouseRelease methods to support dragging of that object. List any additional instance variables you'll need. (6 points)

Terminology

virtual key codes
graphical user interface components

Examples