Definition of Java 11 Interview Questions

Java 11 interview questions and answers are useful at the time of giving an interview on Java. Java is used in multiple companies where we are developing applications. While giving the interview on Java these questions and answers are very helpful. At the time applying for the post of Java developer then we need to prepare the question and answer of Java technology. Java 11 is the type of java.

Introduction to Java 11 Interview Questions

Java 11 interview question is very helpful for those who are preparing for the mock test or the job interview. As we know java 11 contains multiple features that did not exist in java 8. It will be offering multiple new methods of string that was not available in the version of java 8. It is also a long-term support release after the version of java 8.

Java 8 is used in multiple organizations for developing new applications or migrating existing applications. The demand for java 11 technology is increasing after it will declare as a long-term support release, also it will contain new features so the developer is easily developing the application by using the java 11 version.

Top 15 Java 11 Interview Questions and Answers

Below are the java 11 interview questions and answers as follows. These questions and answers are helpful in multiple scenarios.

Q1. Why java 11 is crucial as compared to the other java versions?

Answer: Java is the supporting long term, from java 11 JDK of Oracle is not free for commercial use. We can use the Oracle JDK for development, but for commercial use, we need to buy the license. After java version 11, Oracle is not providing free support for any java version.

Q2. Which commercial features are available in java 11 as open source?

Answer: The commercial feature of Oracle JDK is open sourced into the Flight recorder of java. In addition to the Flight recorder mission control of java is also an open-source feature of java 11.

Q3. What is the use of a flight recorder in java 11?

Answer: Java 11 flight recorder is a data collection framework that we can use to get the metrics of our JVM. We can implement a flight recorder as a bounded circular buffer for configurable amounts. The important thing about flight recorder in java 11 is that we can leave enabled prediction because it will define low overhead.

Q4. What is mission control in java 11?

Answer: Mission control in java 11 is defined as an application that is analyzing the dumps that come from the flight recorder also it will give us a graphical overview that what is happening inside the java virtual machine.

Q5. Which methods are added in java 11 related to String API?

Answer: The below methods are added to the string API that is related to the String API. All the methods are used to define String API.

isBlank() – It will return true if the string is empty or it will contain the spaces.
Lines() – It will return a stream of lines that was extracted from the string.
Strip(), strip leading (), and strip trailing () – It will strip whitespaces from the specified string.
Repeat – It will return a new string that concatenates the string that is repeated n times.

Q6. What is the Z garbage collector in java 11?

Answer: The Z garbage collector in java 11 is also known as ZGC.

It is a low-latency garbage collector that is designed to meet the following goals as follows.

Pause the time that did not exceed more than 10ms.
Pause time is not increase the live-set or heap size.
Handle the heap ranging from hundreds of megabytes.

Q7. What is nest-based access control in java 11?

Answer: The Nest-based access control is supporting to private member access within the member of the nest, we have no need for any auto-generated bridge method. This change is backward compatible, and it was not required any code change, it’s the optimization of the java compiler to remove the access of the bridge method internally.

Q8. Why open and oracle JDK is different from each other in java 11?

Answer: The difference between Oracle JDK and open JDK is that JDK contains some features. For removing these features between Oracle JDK and open JDK, oracle committed to open source those features of OpenJDK. Before java 10 both of the features are free for production use.

Q9. Which module is deprecated in java 11?

Answer: The below module shows that was deprecated in java 11. That module is no longer supported in java 11.

JavaScript engine of Nashorn.
Jar file compression scheme of Pack200.

Q10. What is the use of wrapper class in java 11?

Answer: The wrapper class is used to convert the java primitives into reference types. Every data type will contain a class this class is known as the wrapper class because it will be wrapping the primitive data type into the class object.

Q11. What is the use of a constructor in java 11?

Answer: In java 11 we are referring constructor as a code block that was used to initialize the object. It will contain the same name as the class name. The constructor will not contain any return type, it is called when our object is created. In Java, the constructor is divided into two types i.e. default and parameterized constructors.

Q12. What is the use of the var keyword in java 11?

Answer: In Java, the local variable is declared with the var keyword. When using a lambda expression, we may also utilize the var keyword to avoid using a variable name that conflicts with another variable.

Q13. What is the JIT compiler in java 11?

Answer: We are using the JIT compiler in java to improve the performance of our applications. JIT is compiling parts of byte code that contain similar functionality at the same time and it will also reduce the compilation time.

Q14. What is the use of reflection in java 11?

Answer: Reflection is a runtime API that is used to change and inspect the behavior of classes and methods. It is a very powerful tool, it allows us to analyze the classes, fields, and methods at runtime.

Q15. What is the use of JVM in java 11?

Answer: The JVM is nothing but the virtual machine of java. It is an abstract machine, it is providing a runtime environment where we are running our Java 11 code. It will follow three notations i.e. implementation, runtime instance, and specification.

Conclusion

Java 11 interview question is very helpful for those who are preparing for the mock test or the job interview. Java 11 interview questions and answers are useful at the time of giving an interview on Java. Java is used in multiple companies where we are developing applications. While giving the interview on Java these questions and answers are very helpful.

Quiz Result
Total Questions	Correct Answers	Wrong Answers	Percentage