Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

What are the methods of object class ?

1 1156

What are different types of inner classes ?

1 1147

What is stringjoiner ?

1 1065

Difference between final and effectively final ?

1 1222

Difference between abstract and concrete class ?

1 1336

Can we create an object if a class doesn't have any constructor ( not even the default provided by constructor ) ?

1 1191

Can we access instance variables within static methods ?

1 1205

What is the use of optional ?

1 1140

Difference between doublesummarystatistics, intsummarystatistics and longsummarystatistics ?

1 1089

Difference between final and effectively final ? Why is effectively final even required ?

1 1097

Similarity and difference between static block and static method ?

1 1041

Difference between class#getinstance() and new operator ?

1 1335

What is a lambda expression ? What's its use ?

1 1208

Describe what happens when an object is created in java ?

1 1130

Difference between == and .equals() ?

1 1088

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Un-Answered Questions { Core Java }

Write a program to print count of empty strings in java 8?

1096

How to sort array in descending order in java?

1005

Explain public static void main(string args[]) in java.

1089

What is the difference between break and continue statements?

1135

explain different ways of using thread? : Java thread

1092

What is a classloader in java?

1101

What are the differences between heap and stack memory in java?

1153

What is an object in java and how is it created?

1154

What is parsing in java?

1052

Write a program to find the whether a number is an Armstrong number or not?

1110

Realized?

2278

How to create a base64 decoder in java8?

1152

What do you mean by an interface in java?

1110

What is java string pool?

1091

Write a java program to find the route that connects between Red and Green Cells. General Rules for traversal 1. You can traverse from one cell to another vertically, horizontally or diagonally. 2. You cannot traverse through Black cells. 3. There should be only one Red and Green cell and at least one of each should be present. Otherwise the array is invalid. 4. You cannot revisit a cell that you have already traversed. 5. The maze need not be in the same as given in the above example

2677

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