With its central and unique ability to execute bytecode on any platform, the Java programming language has gained increasing popularity in a wide area of computation especially in internet-related applications. Even with its broad applicability, the standard Java virtual machine is deficient in the capability to express real-time constraints. In this study, a specification language is suggested to specify real-time constraints, which generates skeletal Java code containing the invocation of real-time APIs. The use of multithreading is proposed to implement real-time APIs without modifying the current Java semantics. This approach may expand the application area of Java applet with existing language features especially to specify soft real-time constraints for visual specification or modeling based on internet. With the suggested technique we can specify timing semantics including maximum, minimum, durational, and relative timing constraints. The detailed execution orders of multithreads to express many forms of timing constraints have been packaged into API libraries for maintainability and readability.
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