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DJ: A Java-based Constraint Language and System

DJ (Declarative Java) is an extension of Java that supports constraint programming. With DJ, users do not need to learn the complicated class hierarchy of the AWT package or Java's layout managers. To construct a GUI, users only need to specify the components that compose the GUI and the relationship among the components by using constraints. As a constraint language, DJ can be used not only to solve Constraint Satisfaction Problems (CSPs) but also to specify how solutions are displayed graphically. DJ is a compiling language that uses Java as the object language. Because of this, solutions of CSPs can be disseminated on the Internet easily.