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Java Backend Engineer Interview Questions

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486 java backend engineer interview questions shared by candidates

1. Difference between Arraylist and linkedlist. 2. What is the time complexity of insertion in linkedlist? 3. Which one do you prefer in which condition? 4. Which one do you use to insert an array of integers? 5. Given two lists - remove all the elements of second list from first list. 6. Employee class - Employee1 emp1 = ID:1, name : ABC Employee2 emp2 = ID:1, name : ABC Treemap map = new TreeMap<>(); map.put(emp1,7); map.put(emp2,8); Is this allowed? What will be the size of the treemap in this case? 7. Internal implementation of put method in treemap. 8. Internal implementation of hashcode and equals in object class. 9. Time complexity of removeAll() in Linkedlist
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Java Backend Developer ()

Interviewed at Wissen Infotech

3.8★
Jan 14, 2021

1. Difference between Arraylist and linkedlist. 2. What is the time complexity of insertion in linkedlist? 3. Which one do you prefer in which condition? 4. Which one do you use to insert an array of integers? 5. Given two lists - remove all the elements of second list from first list. 6. Employee class - Employee1 emp1 = ID:1, name : ABC Employee2 emp2 = ID:1, name : ABC Treemap map = new TreeMap<>(); map.put(emp1,7); map.put(emp2,8); Is this allowed? What will be the size of the treemap in this case? 7. Internal implementation of put method in treemap. 8. Internal implementation of hashcode and equals in object class. 9. Time complexity of removeAll() in Linkedlist

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