Appendix JETS (pages 92-onward) contains an explanation of JETS -
that is the subset of Java required for the IB Exams.  

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Below are links to the Java source code for the algorithms from Appendix 2 of the IBO Comp Sci Guide.

Hello.java

IBIO.java

Quadratic.java

NameSaver.java

Encrypt.java

FileSorter.java

FactorTree.java

Calendar.java

WorkDays.java