MethodReferencesExamples.java

import java.util.function.BinaryOperator;

public class MethodReferencesExamples {
	
	public static <T> T mergeThings(T a, T b, BinaryOperator<T> merger) {
		return merger.apply(a, b);
	}
	
	public static String appendStrings(String a, String b) {return a+b;}
	
	public String appendStrings2(String a, String b) {return a+b;}

	public static void main(String[] args) {

		// Calling the method mergeThings with a lambda expression
		System.out.println(MethodReferencesExamples.mergeThings("Hello ", "World", (a,b) -> a+b));
		
		// Reference to a static method
		System.out.println(MethodReferencesExamples.mergeThings("Hello ", "World", MethodReferencesExamples::appendStrings));
	
	
		// Reference to an instance method of a particular object
		MethodReferencesExamples myApp = new MethodReferencesExamples();
		System.out.println(MethodReferencesExamples.mergeThings("Hello ", "World", myApp::appendStrings2));
		
		// Reference to an instance method of an arbitrary object of a particular type
		System.out.println(MethodReferencesExamples.mergeThings("Hello ", "World", String::concat));
	}

}