Java Method Reference - Double Colon (::) Operator Explained with Examples

Published: 21 October 2023
on channel: Anupama

110

In this video, I've explained what the double colon operator is in Java and also provided examples to help you understand it better. There are three different types of method references.

1. Reference to a static method.
2. Reference to an instance method.
3. Reference to a constructor.

Example: Reference to a static method.
public class Test {
Test(){
System.out.println("Constructor called");
}
public static void m1(){
System.out.println("Function m1 called");
}
public void m2(){
System.out.println("Function m2 called");
}
}

public class MethodReference {
public static void main(String[] args) {
Runnable r = Test::m1;
Thread thread = new Thread(r);
thread.start();
}
}

Example: Reference to an instance method.

public class MethodReference {
public static void main(String[] args) {
Test test = new Test();
Runnable r = test::m2;
Thread thread = new Thread(r);
thread.start();
}
}

Example: Reference to a constructor.
public interface Demo {
Test get();
}
public class MethodReference {
public static void main(String[] args) {
Demo demo= Test::new;
demo.get();
}
}

Thank you,
Anupama

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