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18 Mostly Used Java List Methods for QA during Interview Here are 18 most used methods that you should know: 1. add(E element) - Adds the specified element to the end of the list. 2. addAll(Collection<? extends E> c) - Adds all elements of the specified collection to the end of the list. 3. remove(Object o) - Removes the first occurrence of the specified element from the list. 4. remove(int index) - Removes the element at the specified position in the list. 5. get(int index) - Returns the element at the specified position in the list. 6. set(int index, E element) - Replace the element at the specified position in the list with the specified element. 7. indexOf(Object o) - Returns the index of the first occurrence of the specified element in the list. 8. contains(Object o) - Returns true if the list contains the specified element. 9. size() - Returns the number of elements in the list. 10. isEmpty() - Returns true if the list contains no elements. 11. clear() - Removes all elements from the list. 12. toArray() - Returns an array containing all the elements in the list. 13. subList(int fromIndex, int toIndex) - Returns a view of the portion of the list between the specified fromIndex, inclusive, and toIndex, exclusive. 14. addAll(int index, Collection<? extends E> c) - Inserts all elements of the specified collection into the list, starting at the specified position. 15. iterator() - Returns an iterator over the elements in the list. 16. sort(Comparator<? super E> c) - Sorts the elements of the list according to the specified comparator. 17. replaceAll(UnaryOperator<E> operator) - Replaces each element of the list with the result of applying the given operator. 18. forEach(Consumer<? super E> action) - Performs the given action for each element of the list until all elements have been processed or the action throws an exception. LinkedIn Guide to Creating

QA Knowledge: Unique interview question Question: Explain the differences between == and equals() in java. Answer: In Java, both `==` and `equals()` are used for comparison, but they serve different purposes and work in different ways. Here's a detailed explanation: 1. `==` Operator: Purpose: The `==` operator is used to compare primitive data types and to check reference equality for objects. Primitive Types: When used with primitive data types (e.g., int, char, boolean, etc.), `==` compares the actual values. For eg: int a=5; int b=5; System.out.println(a == b); // true Objects: When used with objects, `==` checks whether the two references point to the same memory location (i.e., whether they are the same object). For eg: Strings1=newString("hello"); Strings2=newString("hello"); System.out.println(s1 == s2); // false, because s1 and s2 reference different objects. 2. `equals()` Method Purpose: The `equals()` method is used to compare the content or state of two objects, not their memory addresses. Default Behavior: The default implementation of `equals()` in the Object class compares memory addresses (similar to `==`). However, many classes (like String, Integer, etc.) override this method to compare the actual content of the objects. For eg: String s1 = new String("hello"); String s2 = new String("hello"); System.out.println(s1.equals(s2)); // true, because the content of s1 and s2 is the same **Key Differences: `==`: Checks if two references point to the same object in memory (reference equality). `equals()`: Checks if two objects are equivalent in terms of their content (logical equality). In summary, use `==` when you want to compare the memory addresses (i.e., check if two references point to the same object), and use `equals()` when you want to compare the actual content of the objects.

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Hello, Connections !! We are Hiring. Profile : Python + AWS  Experience: 5+ Years Location: Hybrid (Pune,Mumbai, Jaipur) Description: AWS (Strong) SNS lambda APIGateway EC2, ECS, CloudWatch - Should have hands on experience Good understanding about S3, SNS, Lambda, EMRs, Redshift, CloudWatch, Athena, Glue, API Gateway, Terraform and moreover hands on experience in these services. For example, one of our positions (AWS + Python/Django) - basic understanding about how to use API Gateway to expose GET, PUT end points. Creating a Lambda to process files as soon as notification arrives. Should know how to troubleshoot failures related to EMR job failures and understand how to use CloudWatch for debugging. Django Web programming Python Django (strong) Create web and API application - using Python, Django, how to get endpoints, expose end-points Understanding of Microservices should be clear Database (Average) Diff types of joins, schemas, group by, having, CTE, temp table, fact table, partitioning, sharding - Basic experience and understanding of this. Better to have PostgreSQL and Redshift data warehouse. Interested Candidate can send their resumes to - https://lnkd.in/dc9axDkq

Hello, Connections !! We are Hiring. Profile : Python + AWS  Experience: 5+ Years Location: Hybrid (Pune,Mumbai, Jaipur) Description: AWS (Strong) SNS lambda APIGateway EC2, ECS, CloudWatch - Should have hands on experience Good understanding about S3, SNS, Lambda, EMRs, Redshift, CloudWatch, Athena, Glue, API Gateway, Terraform and moreover hands on experience in these services. For example, one of our positions (AWS + Python/Django) - basic understanding about how to use API Gateway to expose GET, PUT end points. Creating a Lambda to process files as soon as notification arrives. Should know how to troubleshoot failures related to EMR job failures and understand how to use CloudWatch for debugging. Django Web programming Python Django (strong) Create web and API application - using Python, Django, how to get endpoints, expose end-points Understanding of Microservices should be clear Database (Average) Diff types of joins, schemas, group by, having, CTE, temp table, fact table, partitioning, sharding - Basic experience and understanding of this. Better to have PostgreSQL and Redshift data warehouse. Interested Candidate can send their resumes to - https://lnkd.in/dc9axDkq

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Hello, Connections !! We are Hiring. Profile : Python + AWS  Experience: 5+ Years Location: Hybrid (Pune,Mumbai, Jaipur) Description: AWS (Strong) SNS lambda APIGateway EC2, ECS, CloudWatch - Should have hands on experience Good understanding about S3, SNS, Lambda, EMRs, Redshift, CloudWatch, Athena, Glue, API Gateway, Terraform and moreover hands on experience in these services. For example, one of our positions (AWS + Python/Django) - basic understanding about how to use API Gateway to expose GET, PUT end points. Creating a Lambda to process files as soon as notification arrives. Should know how to troubleshoot failures related to EMR job failures and understand how to use CloudWatch for debugging. Django Web programming Python Django (strong) Create web and API application - using Python, Django, how to get endpoints, expose end-points Understanding of Microservices should be clear Database (Average) Diff types of joins, schemas, group by, having, CTE, temp table, fact table, partitioning, sharding - Basic experience and understanding of this. Better to have PostgreSQL and Redshift data warehouse. Interested Candidate can send their resumes to - https://lnkd.in/dc9axDkq

Hello, Connections !! We are Hiring. Profile : Python + AWS  Experience: 5+ Years Location: Hybrid (Pune,Mumbai, Jaipur) Description: AWS (Strong) SNS lambda APIGateway EC2, ECS, CloudWatch - Should have hands on experience Good understanding about S3, SNS, Lambda, EMRs, Redshift, CloudWatch, Athena, Glue, API Gateway, Terraform and moreover hands on experience in these services. For example, one of our positions (AWS + Python/Django) - basic understanding about how to use API Gateway to expose GET, PUT end points. Creating a Lambda to process files as soon as notification arrives. Should know how to troubleshoot failures related to EMR job failures and understand how to use CloudWatch for debugging. Django Web programming Python Django (strong) Create web and API application - using Python, Django, how to get endpoints, expose end-points Understanding of Microservices should be clear Database (Average) Diff types of joins, schemas, group by, having, CTE, temp table, fact table, partitioning, sharding - Basic experience and understanding of this. Better to have PostgreSQL and Redshift data warehouse. Interested Candidate can send their resumes to - https://lnkd.in/dc9axDkq

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