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Examples might be simple to improve reading and basic understanding.
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Collection of technical and non technical and Free tutorials and reference manuals with examples for Java8.
XStream, Scrum, Guava, Memcached, Neo4J, CICS, Fortran, EasyMock.
Apache POI, Signals and Systems, JOGL, DB2, PhoneGap, SVG, VSAM
but other than this there are many more tutorials which u can read for free.
COBOL, XSD, XPath, Redis, Java XML, VBA, JFreeChart, Lucene, Selenium.