Advanto Software Java Developer Interview Questions and Answers

Q1. Hashmap internal working
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Q2. Default methods and multiple abstraction, asynchronous calls in java
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Q1. Basics of java like string ,string builder ,Buffer,scp
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Q2. Spring boot annotaions
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Q1. Explain how hashmap internally works
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HashMap internally uses an array of linked lists to store key-value pairs.
• HashMap uses hashing to determine the index of the key in the array.

• If multiple keys hash to the same index, a linked list is used to store them.

• When retrieving a value, the key is hashed to find the index and then the linked list is searched for the key.
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Q2. Difference between vector and Arraylist
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Vector is synchronized and slower, ArrayList is unsynchronized and faster.
• Vector is synchronized, ArrayList is not.

• Vector is slower due to synchronization, ArrayList is faster.

• Vector is legacy class, ArrayList is part of Java Collections framework.

• Vector doubles its size when full, ArrayList increases by 50%.
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Q1. Java & advance java,spring Boot
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I m to get yourlife company to work.
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Q2. Check my skills
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It's like technical round & Hr round , way of language speaking.
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Q3. I ability to doing work hard in this company
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Q4. I'm have read to extra work form this company
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Q5. I hope I think about me good everything it's OK thank you my side.
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Q1. Use of functional interface
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Functional interfaces in Java are interfaces with only one abstract method, used for lambda expressions and method references.
• Functional interfaces can be used with lambda expressions and method references to provide implementation for the single abstract method.

• Examples of functional interfaces in Java include Runnable, Callable, and Comparator.

• Functional interfaces can also have default and static methods in addition
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Q2. Can you use same static method in two different interface
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No, static methods cannot be overridden in interfaces.
• Static methods in interfaces are implicitly public and abstract, so they cannot be overridden.

• If two interfaces have the same static method signature, it will not cause any conflict.

• Implementing classes will have to provide their own implementation of the static method.
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Q1. What is Custom exception?
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Custom exception is a user-defined exception that extends the functionality of the built-in exceptions in Java.
• Custom exceptions are created by extending the Exception class or one of its subclasses.

• They allow developers to define their own exception types for specific scenarios.

• Custom exceptions can include additional methods and fields to provide more information about the exception.

• Example: public class CustomExcept...read more
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Q2. What is roles and responsibilities in your project?
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Q3. Find out duplicate element in array?
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Use a HashSet to find duplicate elements in an array of strings.
• Create a HashSet to store unique elements.

• Iterate through the array and check if the element is already in the HashSet.

• If it is, then it is a duplicate element.

• Example: String[] array = {"apple", "banana", "apple", "orange"};
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Q1. Reverse the array basic questions like star patterns abstraction inheritance polymorphism etc
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An exam used to determine by individual skills

Something assigned,as a particular task or duty