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| Java - Interview Questions and Answers | |||||
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| Ans. boolean - java.lang.Boolean byte - java.lang.Byte char - java.lang.Character double - java.lang.Double float - java.lang.Float int - java.lang.Integer long - java.lang.Long short - java.lang.Short void - java.lang.Void | |||||
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 Discuss Correct / Improve  java java5 data types wrapper classes adapter design pattern  rare | |||||
 Related Questions | |||||
 What are wrapper classes ? | |||||
| What are the benefits of using Wrapper classes over primitive types ? | |||||
| What is the difference between uninitialized values for primitive types and Wrapper classes ? | |||||
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| Explain Autoboxing ? | |||||
| What are Wrapper Classes ? What are Primitive Wrapper Classes ? | |||||
| What Design pattern Wrapper Classes implement ? | |||||
| Will this code give error if i try to add two heterogeneous elements in the arraylist. ? and Why ? | |||||
| Can we compare Integers by using equals() in Java ? | |||||
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| Ans. public class BuggyBread1 { public static void main(String args[]) { // Declare and Initialize the Collection Set<Integer> intSet = new HashSet<Integer>(); // Add Elements intSet.add(1); intSet.add(2); intSet.add(3); intSet.add(4); intSet.add(5); double averageOfNonPrimeFactorials = intSet.stream().filter(p->checkIfPrime(p)).collect(Collectors.averagingInt(p->calculateFactorial(p))); System.out.println(averageOfNonPrimeFactorials ); } static private boolean checkIfPrime(int num){ for(int count=2;count < num;count++){ if(num % count == 0){ return false; } } return true; } static private int calculateFactorial(int num){ int factorial = 1; for(int count=num;count > 0;count--){ factorial = factorial * count; } return factorial; } } | |||||
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| Discuss Correct / Improve java 8 lambda expressions lambda filter Collectors factorial prime number | |||||
| Related Questions | |||||
| What is a Lambda Expression ? What's its use ? | |||||
| Difference between final and effectively final ? Why is effectively final even required ? | |||||
| Difference between Predicate, Supplier and Consumer ? | |||||
| What are the problems one could face while working with serverless technologies like AWS Lambda ? | |||||
| What would you do if you see an error thrown by a lambda function as "Access Denied" while doing something with S3 ? | |||||
| What are the advantages and disadvantages of using Lambda over EC2 ? | |||||
| What are the different trigger types in AWS Lambda ? | |||||
| What does the following lambda expression means ? | |||||
| Difference between DoubleSummaryStatistics , IntSummaryStatistics and LongSummaryStatistics ? | |||||
| What is the use of :: operator wef from Java 8 ? | |||||
