Java Interview Prep
Your one-page roadmap for Java interviews — the most-asked question collections, the core concepts interviewers probe, and the coding questions that come up again and again. Updated September 2026.
Interview question collections
- 30 Core Java Basic Interview Questions for Freshers
- Top 20 Java Exception Handling Interview Questions
- Java J2EE Interview Questions for Experienced
- JSP Servlet Interview Questions for Freshers — Series 1
- JSP Servlet Interview Questions for Freshers — Series 2
- Java BFSI (Banking/Finance) Domain Interview Questions
- Big Data Hadoop Interview Questions
Core concepts interviewers ask about
Strings and immutability
- Why String is Immutable in Java
- How to Create an Immutable Class in Java
- Immutable Classes in Java — Examples
Collections
- HashMap vs Hashtable
- HashMap in Java with Example
- Hashtable in Java with Example
- LinkedHashMap in Java with Example
- How to Sort a HashMap in Java
- Ways to Iterate a HashMap
- Comparable vs Comparator
- Fail-Fast vs Fail-Safe Iterators
- Why the equals() Method?
- Why the hashCode() Method?
Serialization
- What is Serialization in Java
- Serializable vs Externalizable
- The Externalizable Interface
- What is serialVersionUID
- The transient Keyword with Example
Exception handling
- Java Exception Tutorial
- Checked Exceptions in Java
- Runtime Exceptions in Java
- Checked vs Unchecked Exceptions
- How to Create a Custom Exception
- ClassNotFoundException vs NoClassDefFoundError
- What is Fail-Fast in Java
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