JamaicaVM -- User Documentation: The Virtual Machine for Real-time and Embedded Systems | ||
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Prev | Chapter 3. Jamaica Builder | Next |
To illustrate the Builder tool, we want to build the rather simple example Figure HelloWorld.java:
After compilation of this class using javac, it can be executed using the Jamaica Virtual Machine as follows
> jamaicavm HelloWorld Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! ... |
During this execution, the class file HelloWorld.class and several system classes like String.class where loaded by Jamaica from the directories specified in the current CLASSPATH. To create a standalone application, we use the Builder:
> jamaica HelloWorld Jamaica Builder Tool + HelloWorld.c + HelloWorld.makefile Classfile compaction gain: 53.394516% (267947 ==> 124878) gcc "-O0" -o HelloWorld.o -c HelloWorld.c -DNDEBUG -I /fzi/swt/siebert/JamSun/src//bin/../include/ gcc -o HelloWorld /fzi/swt/siebert/JamSun/src//bin/../obj/32/java_lang_Class.o ... strip HelloWorld > |
The created file HelloWorld is a single executable file that contains all the classes required by the application to execute. It can directly be used to run the example:
> ./HelloWorld Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! ... |