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Java
Java is a coding language developed by Sun Microsystems.
It is commonly used to code 'Applets' or as part of JSP.
Many non-Internet applications are also coded using Java.
JavaScript
JavaScript is an 'in-page' coding language that allows interaction within web-pages.
Generally, it is ignored by search engines, as it is used to manipulate content and change it, which is not something that search engine robots can easily calculate,
nor search engine algorithms weight in SERP's.
JavaScript is best used for dHTML, which allows the manipulation of Content, while keeping all content in HTML, where search engines can read it.
For more information...