Method Reference - Reference to a Static Method example.

package com.java2novice.methodreference;

import java.util.ArrayList;
import java.util.List;

public class StaticMethodReferenceEx {

	public static void main(String a[]) {

		List<String> countryList = new ArrayList<>();
		countryList.add("India");
		countryList.add("USA");
		countryList.add("Japan");
		countryList.add("Canada");

		// print the list elements in normal way
		System.out.println("<--- Prior to java-8 --->");
		for(String str:countryList) {
			StaticMethodReferenceEx.printString(str);
		}

		// In Method Reference way
		System.out.println("\n<--- java-8 method reference way --->");
		countryList.forEach(StaticMethodReferenceEx::printString);

		// in Lambda expression way
		System.out.println("\n<--- java-8 lambda expression way --->");
		countryList.forEach(str -> StaticMethodReferenceEx.printString(str));
	}

	public static void printString(String str) {
		System.out.println(str);
	}
}

<--- Prior to java-8 --->
India
USA
Japan
Canada

<--- java-8 method reference way --->
India
USA
Japan
Canada

<--- java-8 lambda expression way --->
India
USA
Japan
Canada