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Singleton class - Multiple ways to design, Data Structure for storing the incoming requests on a multithreaded environment and processing based on intime(Think of treeset). What are types to create an object in java. What are methods to make private on creating singleton class. What are the challenges you faced during project. What is API, uses? API designing for a given scenario. Spring Scopes.
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Software Engineer - Java Backend

Interviewed at Altimetrik

3.9★
Sep 22, 2020

Singleton class - Multiple ways to design, Data Structure for storing the incoming requests on a multithreaded environment and processing based on intime(Think of treeset). What are types to create an object in java. What are methods to make private on creating singleton class. What are the challenges you faced during project. What is API, uses? API designing for a given scenario. Spring Scopes.

1st Technical Round: 1. Method overriding rules? 2. Output? • //classes will compile fine bcos both r throwing run time exceptions • class TestOverride { • void solution() throws NullPointerException { • System.out.println("super"); • } • } • • class TestSubOverride extends TestOverride { • void solution() throws RuntimeException { • System.out.println("sub"); • } • } 2. Given array {4,5,6,1,2,4}; how do u search particular element ex:1? Ans: he was looking for best search algorithm – ans is binary search algorithm 3. Consider I have huge data which is stored randomly, which data structure is best for retrieval with performance of O(1)? Ans: Hashmap bcos of performance O(1) always 4. Write a code to delete a node from LinkedList 5. Write a simple code for Threading. 6. What is difference between callable and Runnable? 7. What is functional interface? 8. Why functional interface should have only one abstract method why not more than one? 9. When we use lamda expressions? 10. What is difference between IOC and dependency injection? 11. Why do we need dependency injection? 12. Scopes of bean in spring? 2nd Technical Round: 1. Why Java is so popular? In depth answer 2. Given Name, write code to print all combinations using that. 3. Given array, {1,2,3,4,5,6,7,8} and {4,1,2,5,1,2,3,4,5,6,7,8}, at any given position how do you find out array is sorted or not. (Circular sorting)
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Senior Software Engineer - Java Developer

Interviewed at Oracle

3.5★
Jul 9, 2018

1st Technical Round: 1. Method overriding rules? 2. Output? • //classes will compile fine bcos both r throwing run time exceptions • class TestOverride { • void solution() throws NullPointerException { • System.out.println("super"); • } • } • • class TestSubOverride extends TestOverride { • void solution() throws RuntimeException { • System.out.println("sub"); • } • } 2. Given array {4,5,6,1,2,4}; how do u search particular element ex:1? Ans: he was looking for best search algorithm – ans is binary search algorithm 3. Consider I have huge data which is stored randomly, which data structure is best for retrieval with performance of O(1)? Ans: Hashmap bcos of performance O(1) always 4. Write a code to delete a node from LinkedList 5. Write a simple code for Threading. 6. What is difference between callable and Runnable? 7. What is functional interface? 8. Why functional interface should have only one abstract method why not more than one? 9. When we use lamda expressions? 10. What is difference between IOC and dependency injection? 11. Why do we need dependency injection? 12. Scopes of bean in spring? 2nd Technical Round: 1. Why Java is so popular? In depth answer 2. Given Name, write code to print all combinations using that. 3. Given array, {1,2,3,4,5,6,7,8} and {4,1,2,5,1,2,3,4,5,6,7,8}, at any given position how do you find out array is sorted or not. (Circular sorting)

1. split array int smaller arrays based on given size. int[] original = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}; int splitSize = 3; /* expected Output [0, 1, 2] [3, 4, 5] [6, 7, 8] [9] */ 2.Flatten object array. Object[] array = { 1, 2, new Object[]{ 3, 4, new Object[]{ 5 }, 6, 7 }, 8, 9, 10 };
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Software Engineer - Java Developer

Interviewed at Wissen Infotech

3.8★
Jun 12, 2023

1. split array int smaller arrays based on given size. int[] original = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}; int splitSize = 3; /* expected Output [0, 1, 2] [3, 4, 5] [6, 7, 8] [9] */ 2.Flatten object array. Object[] array = { 1, 2, new Object[]{ 3, 4, new Object[]{ 5 }, 6, 7 }, 8, 9, 10 };

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