Java Programming Examples

• Hello.java, a simple stand-alone application that asks your age and makes decisions based on it. Note that it uses text I/O, which really isn't Java's strong point....
• HelloApplet.java, essentially the same thing implemented as an Applet using AWT
• HelloJApplet.java, essentially the same thing implemented as a JApplet using Swing (which is more up-to-date, and generally preferred over AWT)
• HelloJFrame.java, essentially the same thing implemented as a stand-alone GUI application using Swing
• UseUpMem.java, a program that repeatedly allocates memory without ever explicitly deallocating it; the program does not run out of memory and crash; compare with the C version, which does run out of memory and crash (so would C++).
• ArrayTest.java, a demonstration of declaring, initializing, passing, receiving, and looping through arrays. Note that in Java, arrays know their own length.
• inheritance.zip, a collection of examples presented in class on November 3-5, 2003, illustrating constructors, default arguments, inheritance, abstract methods, abstract classes, invoking constructors and other methods from the superclass, and interfaces. You can also browse these examples in the inheritance folder.
• applet_examples.zip, a collection of examples presented in class on November 7, 2003, illustrating Applets, paint() methods, repaint() as a form of animation, GUI components, listeners, and inner classes. You can also browse these examples in the applet_examples folder.
• IO.zip, a collection of examples, mostly presented in class in November 10, 2003 (but somewhat improved and expanded after class) dealing with console, file, and network I/O in Java.