Fujitsu J Adapter Class Generator Developing an Application That Uses an Adapter Class

22 Chapter 3. Developing Programs
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REPOSITORY.
CLASS J-OBJECT AS "java-lang-Object"
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LINKAGE SECTION.
01 P1-OUTPUTSTREAM OBJECT REFERENCE J-OBJECT.
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Developing an Application That Uses an Adapter Class
This section explains how to develop a program that uses an adapter class.
Outline
The flow of program processing using the adapter class is as follows:
1. Initialization of the Java VM.
2. In the case of a multithreaded application, connection of the current thread to
the Java VM .
3. Generation of the object.
4. Calling the method.
5. In the case of a multithreaded application, disconnection from the Java VM .
6. Termination of the Java VM.
Also, be careful when performing the following operations:
• Manipulating a variable
• Comparing object references
• Assignment to a subclass
• Mapping java.lang.String into PIC X.
• End control of character string
• Exception processing
Initializing the Java VM
To use an adapter class, the Java virtual machine (VM) must first be initialized . Use
the JVM-INIT method or the JVM-ATTACH method of the FJ-JAVA-CONTROL class to
initialize the Java VM.
A coding sample is shown below:
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REPOSITORY.
CLASS FJ-JAVA-CONTROL
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PROCEDURE DIVISION.
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INVOKE FJ-JAVA-CONTROL "JVM-INIT".
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