MethodReferenceUpperCase.java

package org.arpit.java2blog;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;

public class MethodReferenceUpperCase {

	public static void main(String[] args) {
		List<String> listOfNames = Arrays.asList(new String[] {"Andrew","Mary","Sohan","Deby"});
		
		// Using lambda expression
		Function<String,String> function1= (name) -> name.toUpperCase();
		ArrayList<String> collect1 = listOfNames.stream().map(function1)
				                                        .collect(Collectors.toCollection(ArrayList::new));
		System.out.println(collect1);
		
		// Using method reference
		Function<String,String> function2= String::toUpperCase;
		ArrayList<String> collect2 = listOfNames.stream().map(function2)
						                                  .collect(Collectors.toCollection(ArrayList::new));
		System.out.println(collect2);
	}
}