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156 java back end developer interview questions shared by candidates

Coding: the problem received a string, like "a b1 c2", output is "cba". The input contains character, space, and number. We need to only use the letter part and reverse the string. differences between StringBuffer and StringBuilder. And some database questions, such as JOIN.
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Java Back-end Developer

Interviewed at Antra

4.1★
Sep 12, 2022

Coding: the problem received a string, like "a b1 c2", output is "cba". The input contains character, space, and number. We need to only use the letter part and reverse the string. differences between StringBuffer and StringBuilder. And some database questions, such as JOIN.

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?
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Back-end Java Developer

Interviewed at Unilog Content Solutions

3.5★
Jul 9, 2021

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?

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