QMetry Java Developer Interview Questions and Answers

Prepare basic like core java , spring boot and MySQL.

Q1. What is hashcode method does?
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Q2. What is internal workingd of Hashmap
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.
• HashMap uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine its index in the array.

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

• To retrieve a value, the key is hashed again to find the correct index and then the l...read more
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Q3. What is method overriding and overloading
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Method overriding is when a subclass provides a specific implementation of a method that is already provided by its parent class. Method overloading is when multiple methods have the same name but different parameters.
• Method overriding is used for runtime polymorphism.

• Method overloading is used for compile-time polymorphism.

• Example of method overriding: public class Animal { public void sound() { System.out...read more
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Q1. Focus on core java , Like string , and java collections , and spring , spring boot
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