Java 8 Features - Functional Interface with Class Notes .?

@codewith_kingshuk #java8#KingBommTech
https://kingbomm.blogspot.com/2021/10/java-18-new-features.html
⚡⚡Functional Interface:??

?An interface which contains only one abstract method is called Functional interface.
@FunctionalInterface
Interface I{
Public abstract void m1();
}
?It may contain more than one default methods.
Interface J{
Public abstract void m1();
Default void m2(){
}
Default void m3(){
}
}
?It may contain more than one static method also.
Interface J{
Public abstract void m1();
static void m2(){
}
static void m3(){
}
}
?We can declare more than one of java.lang.Object class methods.
@FunctionalInterface
interface J{
public abstract void m1();
static void m2(){
}
static void m3(){
}
default void m4() {

}
default void m5() {

}
@Override
public String toString();
@Override
public int hashCode();
}

It is suitable for developing Functional Programming in java.
??Example on above all instructions of Function Interface.
@FunctionalInterface
interface J{
public abstract void m1();
static void m2(){
System.out.println("static m2 method");
}
static void m3(){
System.out.println("static m3 method");
}
default void m4() {
System.out.println("default m4 method");
}
default void m5() {
System.out.println("default m5 method");
}
@Override
public String toString();
@Override
public int hashCode();
}

public class Test implements J {
public void m1() {
System.out.println("this implementation of abstract method in J");
}
public static void main(String[] args) {
J obj = new Test();
obj.m1();
J.m2();
J.m3();
//J.m4();//invalid
//J.m5();//invalid
obj.m4();
obj.m5();
}
}

⚡⚡Method References :??
https://youtu.be/1mB9msLWpZE
⚡⚡Lambda Expressions:??
https://youtu.be/hqXv4W1UHP0

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