Draft for code that will be used to demonstrate how changing lambda to method reference can change the program behaviour

MethodReferenceSemanticChangeTest.java

package pl.jellysoft;

import org.junit.Test;

import java.util.Arrays;

public class MethodReferenceSemanticChangeTest {

    // final will solve it
    private BusinessObject businessObject = new BusinessObject();

    @Test
    public void semanticChangeTest() {
        //BusinessObject businessObject = new BusinessObject();

        Arrays.asList("One", "Two", "Three")
              .forEach(o -> businessObject.print(o));
//              .forEach(businessObject::print);
    }

    private class BusinessObject {
        Object getObject() {
            return null;
        }

        void print(Object o) {
            System.out.println(o.toString());
            businessObject = new BusinessObjectDifferentImpl();
        }
    }

    private class BusinessObjectDifferentImpl extends BusinessObject {
        @Override
        void print(Object o) {
            super.print("Prefix:" + o);
        }
    }

}