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6,034 java senior interview questions shared by candidates

1)Which Java Version worked upon? Java 8 features? Stream API? 2)Why should the sub class exceptions be used before super class exceptions in a catch block? try{ //something } catch(RuntimeException|NullPointerException|IOException e){ } will the above code work? No it is going to be an error, but why is it happening? 3)Abstract class and Interface can have methods declared and defined. So when to use abstract class, when to use interface? 4)Hashmap internal implementation? 5)We have a map to store String and Integer key-value pairs as shown below. How to store data case-insensitive? Map<String,Integer>map=new HashMap<>(); map.put("abc",10000); map.put("ABC",10000); Above mentioned map should only store one key-value pair. 6)Design patterns? 7)How to create a singleton class? How to use it in Main class? 8)Chess boards question(two 8*8 array) on how a king at a certain position can be attacked by queens? How many possible queens can attack?
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Senior Java Developer

Interviewed at Bounteous x Accolite

3.3★
Jul 17, 2021

1)Which Java Version worked upon? Java 8 features? Stream API? 2)Why should the sub class exceptions be used before super class exceptions in a catch block? try{ //something } catch(RuntimeException|NullPointerException|IOException e){ } will the above code work? No it is going to be an error, but why is it happening? 3)Abstract class and Interface can have methods declared and defined. So when to use abstract class, when to use interface? 4)Hashmap internal implementation? 5)We have a map to store String and Integer key-value pairs as shown below. How to store data case-insensitive? Map<String,Integer>map=new HashMap<>(); map.put("abc",10000); map.put("ABC",10000); Above mentioned map should only store one key-value pair. 6)Design patterns? 7)How to create a singleton class? How to use it in Main class? 8)Chess boards question(two 8*8 array) on how a king at a certain position can be attacked by queens? How many possible queens can attack?

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