CitiusTech Senior Software Developer Interview Questions and Answers

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Q1. How hashmap works in java?
Ans. 
HashMap in Java is a data structure that stores key-value pairs and allows fast retrieval of values based on keys.
• HashMap uses hashing to store key-value pairs in an array of linked lists.

• It allows null keys and values.

• HashMap provides constant-time performance for basic operations like get and put.

• Example: HashMap map = new HashMap<>(); map.put("key1", 1); int value = map.get("key1");
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Q2. Multithreading in java deadlock, wait and join,
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Q3. Java 8 feature like streams
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Q1. SQL Inner join, outer join
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Q2. Asked about my project
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Q1. JAVA 8 new features spring framework
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Q2. What is marker interface why we use
Ans. 
Marker interface is an empty interface used to mark classes for special treatment.
• Marker interface has no methods or fields, it is used to provide metadata about the class.

• It is used by frameworks or APIs to identify classes that implement the interface.

• Examples include Serializable interface in Java, which marks classes as serializable.
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Q1. Basic Angular and Javascript
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Q2. Data sharing angular components
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Q3. Css padding margin diff
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Q1. Just salary discussion
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