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Technical Lead Java Interview Questions

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405 technical lead java interview questions shared by candidates

1. Solid principles 2. Singleton pattern, in case if we pass hashmap- map can be altered and it will destroy singleton, how to handle that 3. How to create threads 4. How to execute 10 threads at a time 5. How to create global exception class 6. When to use arraylist and linkedlist 7. Completable in java 8 8. What's changed in hashmap in java 8 9. Deep copying and shallow copying 10. Use of volatile keyword in java 11. Programming a. String ="I love programming" -we need to count the length and arrange it in desc but that should be return as string using stream api b. List in = Arrays.asList(1,3,7,0,6,7,8,0); need to sort this and put only 0 at first and let the remaining stay as it is using stream API
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Java Lead Developer

Interviewed at Hexaware Technologies

3.7★
May 23, 2025

1. Solid principles 2. Singleton pattern, in case if we pass hashmap- map can be altered and it will destroy singleton, how to handle that 3. How to create threads 4. How to execute 10 threads at a time 5. How to create global exception class 6. When to use arraylist and linkedlist 7. Completable in java 8 8. What's changed in hashmap in java 8 9. Deep copying and shallow copying 10. Use of volatile keyword in java 11. Programming a. String ="I love programming" -we need to count the length and arrange it in desc but that should be return as string using stream api b. List in = Arrays.asList(1,3,7,0,6,7,8,0); need to sort this and put only 0 at first and let the remaining stay as it is using stream API

Ques : Write a pgm for prime numbers , and find a dupplicate numbers in a sorted list. Ques : Write a immutable object with date object . Ques : What is reentrant lock? Ques :Coding question asked to do in second round: Below are the given coordinates of points on graph .{1,0},{2,0},{3,0},{-1,0},{0,2},{-2,0} Find all the points that are at second farthest distance from center i.e. {0,0} ? Answer for above input {0,2},{2,0},{-2,0} Formula to get distance from center is d2=x2+y2
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Lead Consultant Java

Interviewed at Bounteous x Accolite

3.4★
Aug 1, 2022

Ques : Write a pgm for prime numbers , and find a dupplicate numbers in a sorted list. Ques : Write a immutable object with date object . Ques : What is reentrant lock? Ques :Coding question asked to do in second round: Below are the given coordinates of points on graph .{1,0},{2,0},{3,0},{-1,0},{0,2},{-2,0} Find all the points that are at second farthest distance from center i.e. {0,0} ? Answer for above input {0,2},{2,0},{-2,0} Formula to get distance from center is d2=x2+y2

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