Example of Using a JVM COBOL Wrapper Class

The following example illustrates how you can expose a procedural program to JVM COBOL applications by wrapping the program in a JVM COBOL wrapper class first. You then let other managed applications talk to the wrapper class using Object-Oriented (OO) syntax. The wrapper class, in its turn, talks to the procedural program.

There are different ways to write wrapper classes and this example demonstrates two of them.

You are going to use a simple procedural COBOL program, a calculator, which performs the basic arithmetic operations. You will use Visual COBOL to create a JVM COBOL project to hold the code of the procedural program and a JVM COBOL wrapper class for the procedural code. You will also create a project for a JVM COBOL front-end application that will communicate with the procedural module using the wrapper class.