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How to pass a function as a parameter in Java
Yes. From Java 8 onwards, we can do so using method references.
Method references help to point to methods by their names. A method reference is described using "::" symbol. A method reference can be used to point the following types of methods −
Static methods
Instance methods
Constructors using new operator (TreeSet::new)
Method Reference Example
Create the following Java program using any editor of your choice in, say, C:\> JAVA.
Java8Tester.java
import java.util.List;
import java.util.ArrayList;
public class Java8Tester {
public static void main(String args[]) {
List names = new ArrayList(); names.add("Mahesh");
names.add("Suresh");
names.add("Ramesh");
names.add("Naresh");
names.add("Kalpesh");
names.forEach(System.out::println);
}
}Here we have passed System.out::println method as a static method reference.
Verify the Result
Compile the class using javac compiler as follows −
C:\JAVA>javac Java8Tester.java
Now run the Java8Tester as follows −
C:\JAVA>java Java8Tester
Output
It should produce the following output −
Mahesh Suresh Ramesh Naresh Kalpesh
Updated on: 17-Jun-2020
3K+ Views
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