Understanding References, Packages, and Javadoc in Java: A Comprehensive Guide, Slides of Java Programming

Download Understanding References, Packages, and Javadoc in Java: A Comprehensive Guide and more Slides Java Programming in PDF only on Docsity! References, packages and javadoc “pointers” are “references” memory locations Docsity.com Announcements HW 2 solutions on moodle ®& Docsity.com References - null If a variable references null, then you will crash your program if you use the reference For example: String x = null; int y = x.length(); Docsity.com References - copying Last week, we saw “=” just copies the reference like below: FakeClass x = new FakeClass(); FakeClass y; y=x; // variables simply have same reference Have to manually copy all the data in the class (See: CopyConstructor.java) Docsity.com References - leaking If data is private, then it can only be changed through methods, right? Classes are stored as references... If you give out its reference, then it can be changed (See: NextInLine.java and Counter.java) Docsity.com Packages Java files in a packages are grouped together and you can see and use classes in the same package Docsity.com javadoc and importing javadoc gives descriptions of how classes, methods, etc. should be used (See: SampleJavadoc.java) To import other packages and/or JARs (other people's Java code) in NetBeans, simply right click on the “Libraries” in the package Docsity.com