Part 1
Interview questions on Java 8 Default Method for experienced covered in this post:
What are default methods? What is the
basic purpose of default methods?
-
Methods defined inside interface with default keyword is
called default method.
-
Since, Java 8 you can have method implementation inside the
interface.
-
Default methods can be used for backward compatibility.
-
In the regular case, if you declare or add a new method in
the interface then million of code may break so avoiding this situation, we
can add a default method inside the interface so no code will be
affected.
-
Please refer to the below example.
|
package simplifiedjava.crackedInterview.java8;
public
interface
InterfaceForDefaultMethod {
System.out.println("m1() from DefaultMethodDemo interface is called");
} } package simplifiedjava.crackedInterview.java8; public class DefaultMethodDemo implements InterfaceForDefaultMethod{
public
static
void
main(String[] args) {
InterfaceForDefaultMethod demo
= new
DefaultMethodDemo();
demo.m1();
DefaultMethodDemo demo1
= new
DefaultMethodDemo();
demo1.m1();
}
}
Output:
m1() from DefaultMethodDemo interface is called
m1() from DefaultMethodDemo interface is called |
 
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Can you override default method?
-
Yes, we can override the default method in the implementation
class.
-
Please refer to the below example.
|
package simplifiedjava.crackedInterview.java8; public interface InterfaceForDefaultMethod {
default
void
m1() {
System.out.println("interface m1() method called.");
} } package simplifiedjava.crackedInterview.java8; public class DefaultMethodDemo implements InterfaceForDefaultMethod{
public
void
m1() {
System.out.println("Class m1() method called."); }
public
static
void
main(String[] args) {
InterfaceForDefaultMethod demo
= new
DefaultMethodDemo();
demo.m1();
DefaultMethodDemo demo1
= new
DefaultMethodDemo();
demo1.m1();
}
}
Output:
Class m1() method called. Class m1() method called. |
- Java interview questions and answers all MNC - Click here
-
Basic core java interview questions and answers for freshers - Click here
-
Core java interview questions for 3 years experience - Click here
-
Core java interview questions and answers for 3-5 years exp - Click here
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Core java interview questions and Answers for 5 - 7 Years exp - Click here
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Basic Java Interview Questions and Answers - Click here
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Java interview questions and answers on oops - Click here
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Java interview questions and answers on Strings - Click here
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Java interview questions on exception handling - Click here
-
Interview questions on multithreading in java for experienced - Click here
-
Interview questions on serialization in java for experienced
- Click here
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Interview questions on inner class in java for experienced
- Click here
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Interview questions on Collections in java for experienced
- Click here
|
Thank you techies for visiting this blog. I hope you enjoyed this blog and got more technical knowledge. I have tried to cover all types of questions and provided examples tested on eclipse as much as I can. Guys, please don’t just mug up the questions and answers. Try to clear your concepts with examples. Try to write a code on eclipse once you read the concepts. It will help you to memorize the concepts for a very long time. Simultaneously you will be prepared for interview programs as well. It will help you to survive in the IT sector for a long time. It may be easy to crack an interview but it's really tough to survive in the IT industry with inadequate knowledge and skills. I have collected all the questions from actual interviews attended by my friends, colleagues, college mate and classmate. I have covered frequently asked questions as well as challenging questions. I have included many programs to understand the concept thoroughly. I will try to explain the concept with the help of a real-time program in eclipse. You can share more questions which are not covered in this blog or post. Always welcome your suggestions and queries. I will definitely try to resolve it. Please comment your queries and new set of questions under the comment sections. I will create a new post for those questions.
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