Unilog Content Solutions interview question

Java questions: What is bytecode? Explain singleton class. Can we achieve singleton without private constructor? Explain wrapper class in Java? What is Just in time compiler? String s ="nfs" vs String s = new String()? JS questions: Difference between "==" and "===" in JS What are Data types in Javascript? JS vs JQuery Struts questions: Significance of properties file in Struts. Struts explain flow. Filters vs interceptors in struts redirect vs redirectAction in struts Explain what Value stack is SQL: Sql query to get col values that start with ‘a’ What is right join?