Basic HTML version of Foils prepared 19 July 97

Foil 47 Java 1.0 System Packages

From Java Tutorial - Summer 1997 Part II: Java Language and Object-Oriented Concepts CEWES Tutorial -- July 22-25 1997. by Nancy J. McCracken,Geoffrey C. Fox


java.lang Contains essential Java classes and is by default imported into every Java file and so import java.lang.* is unnecessary. Thread, Math, Object and Type Wrappers are here
java.io contains classes to do I/O. This is not necessary (or even allowed!) for applets which can't do much I/O in Netscape!
java.util contains various utility classes that didn't make it to java.lang. Date is here as are hashtables
java.net contains classes to do network applications. This will be important for any distributed applications
java.applet has the classes needed to support applets
java.awt has the classes to support windowing -- The Abstract Windows Toolkit
java.awt.image has image processing classes
java.awt.peer is a secret set of classes with platform dependent details



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