Interview questions on java Method Reference for experienced.

 Part 1

Interview questions on Java 8 Method Reference for experienced covered in this post:

    What is method Reference? How will you implements method reference?

-          Method reference can be used to use the existing method with :: symbol.

-          Please refer to the below example.

package simplifiedjava.crackedInterview.java8;  @FunctionalInterface public interface MyInterface {       public void display(); }  package simplifiedjava.crackedInterview.java8;  public class MyClass{        public static void main(String[] args) {             MyClass myClass = new MyClass();             MyInterface myInterface = myClass::myMethod;             myInterface.display();       }              public void myMethod() {             System.out.println("My Method Displayed.");       } } Output: My Method Displayed.

 

    What is the purpose of Method Reference?

-          Code reusability can be achieved with method reference.

-          Method reference means we use the readymade method.

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    What is Constructor Reference? How will you implements Constructor reference?

-          Constructor References in Java 8 can be created using the Class Name and the keyword new keyword.

-          Syntaxes for Constructor reference.

1.       Integer::new;

2.       String::new;

3.       ArrayList::new;

4.       Employee::new;

-          Please refer to the below example.

package simplifiedjava.crackedInterview.java8;  @FunctionalInterface public interface StudentInterface {       public Student get(String name); }  package simplifiedjava.crackedInterview.java8;  public class Student {        private String name;        public Student(String name) {             super();             this.name = name;             System.out.println("Student Name is : "+ name);       }            public static void main(String[] args) {             StudentInterface stuInt = Student :: new;             stuInt.get("Shruti");       }     } Output: Student Name is : Shruti

 

    Can you call static method with method reference?

-          Surely, we can call the static method with method reference. 

 

    Write a program to call static methods with method reference?

package simplifiedjava.crackedInterview.java8;  public class Addition {        public static int add(int num1, int num2) {             return num1 + num2;       }     }  package simplifiedjava.crackedInterview.java8;  import java.util.function.BiFunction;  public class AdditionDemo {        public static void main(String[] args) {             BiFunction<Integer, Integer, Integer> bf = Addition::add;               int result = bf.apply(100, 200);             System.out.println("Result "+ result);       } } Output: Result 300

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Upcoming questions in next post:

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