diff --git a/core-java-8/src/main/java/com/baeldung/doublecolumn/Computer.java b/core-java-8/src/main/java/com/baeldung/doublecolon/Computer.java
similarity index 84%
rename from core-java-8/src/main/java/com/baeldung/doublecolumn/Computer.java
rename to core-java-8/src/main/java/com/baeldung/doublecolon/Computer.java
index 18867a2354..9535740309 100644
--- a/core-java-8/src/main/java/com/baeldung/doublecolumn/Computer.java
+++ b/core-java-8/src/main/java/com/baeldung/doublecolon/Computer.java
@@ -1,4 +1,4 @@
-package com.baeldung.doublecolumn;
+package com.baeldung.doublecolon;
 
 public class Computer {
 
@@ -44,6 +44,18 @@ public class Computer {
         this.healty = healty;
     }
 
+    public void turnOnPc() {
+        System.out.println("Computer turned on");
+    }
+
+    public void turnOffPc() {
+        System.out.println("Computer turned off");
+    }
+
+    public Double calculateValue(Double initialValue) {
+        return initialValue/1.50;
+    }
+
     @Override
     public String toString() {
         return "Computer{" + "age=" + age + ", color='" + color + '\'' + ", healty=" + healty + '}';
diff --git a/core-java-8/src/main/java/com/baeldung/doublecolumn/ComputerUtils.java b/core-java-8/src/main/java/com/baeldung/doublecolon/ComputerUtils.java
similarity index 87%
rename from core-java-8/src/main/java/com/baeldung/doublecolumn/ComputerUtils.java
rename to core-java-8/src/main/java/com/baeldung/doublecolon/ComputerUtils.java
index 5c255313a7..d181dfcdf7 100644
--- a/core-java-8/src/main/java/com/baeldung/doublecolumn/ComputerUtils.java
+++ b/core-java-8/src/main/java/com/baeldung/doublecolon/ComputerUtils.java
@@ -1,10 +1,10 @@
-package com.baeldung.doublecolumn;
+package com.baeldung.doublecolon;
+
+import com.baeldung.doublecolon.function.ComputerPredicate;
 
 import java.util.ArrayList;
 import java.util.List;
 
-import com.baeldung.doublecolumn.function.ComputerPredicate;
-
 public class ComputerUtils {
 
     public static final ComputerPredicate after2010Predicate = (c) -> (c.getAge() > 2010);
diff --git a/core-java-8/src/main/java/com/baeldung/doublecolon/MacbookPro.java b/core-java-8/src/main/java/com/baeldung/doublecolon/MacbookPro.java
new file mode 100644
index 0000000000..673429132a
--- /dev/null
+++ b/core-java-8/src/main/java/com/baeldung/doublecolon/MacbookPro.java
@@ -0,0 +1,35 @@
+package com.baeldung.doublecolon;
+
+import java.util.function.Function;
+
+
+public class MacbookPro extends Computer{
+
+    public MacbookPro(int age, String color) {
+        super(age, color);
+    }
+
+    public MacbookPro(Integer age, String color, Integer healty) {
+        super(age, color, healty);
+    }
+
+    @Override
+    public void turnOnPc() {
+        System.out.println("MacbookPro turned on");
+    }
+
+    @Override
+    public void turnOffPc() {
+        System.out.println("MacbookPro turned off");
+    }
+
+    @Override
+    public Double calculateValue(Double initialValue){
+
+        Function<Double,Double> function = super::calculateValue;
+        final Double pcValue = function.apply(initialValue);
+        System.out.println("First value is:" +pcValue);
+        return pcValue + (initialValue/10) ;
+
+    }
+}
diff --git a/core-java-8/src/main/java/com/baeldung/doublecolumn/function/ComputerPredicate.java b/core-java-8/src/main/java/com/baeldung/doublecolon/function/ComputerPredicate.java
similarity index 52%
rename from core-java-8/src/main/java/com/baeldung/doublecolumn/function/ComputerPredicate.java
rename to core-java-8/src/main/java/com/baeldung/doublecolon/function/ComputerPredicate.java
index 94cf0a2be7..5ce491e86a 100644
--- a/core-java-8/src/main/java/com/baeldung/doublecolumn/function/ComputerPredicate.java
+++ b/core-java-8/src/main/java/com/baeldung/doublecolon/function/ComputerPredicate.java
@@ -1,6 +1,6 @@
-package com.baeldung.doublecolumn.function;
+package com.baeldung.doublecolon.function;
 
-import com.baeldung.doublecolumn.Computer;
+import com.baeldung.doublecolon.Computer;
 
 @FunctionalInterface
 public interface ComputerPredicate {
diff --git a/core-java-8/src/main/java/com/baeldung/doublecolumn/function/TriFunction.java b/core-java-8/src/main/java/com/baeldung/doublecolon/function/TriFunction.java
similarity index 89%
rename from core-java-8/src/main/java/com/baeldung/doublecolumn/function/TriFunction.java
rename to core-java-8/src/main/java/com/baeldung/doublecolon/function/TriFunction.java
index 1fb13b9ced..d0d6299479 100644
--- a/core-java-8/src/main/java/com/baeldung/doublecolumn/function/TriFunction.java
+++ b/core-java-8/src/main/java/com/baeldung/doublecolon/function/TriFunction.java
@@ -1,4 +1,4 @@
-package com.baeldung.doublecolumn.function;
+package com.baeldung.doublecolon.function;
 
 import java.util.Objects;
 import java.util.function.Function;
diff --git a/core-java-8/src/test/java/com/baeldung/doublecolumn/TestComputerUtils.java b/core-java-8/src/test/java/com/baeldung/doublecolon/TestComputerUtils.java
similarity index 67%
rename from core-java-8/src/test/java/com/baeldung/doublecolumn/TestComputerUtils.java
rename to core-java-8/src/test/java/com/baeldung/doublecolon/TestComputerUtils.java
index c46630ec13..06cf1cf749 100644
--- a/core-java-8/src/test/java/com/baeldung/doublecolumn/TestComputerUtils.java
+++ b/core-java-8/src/test/java/com/baeldung/doublecolon/TestComputerUtils.java
@@ -1,6 +1,6 @@
-package com.baeldung.doublecolumn;
+package com.baeldung.doublecolon;
 
-import com.baeldung.doublecolumn.function.TriFunction;
+import com.baeldung.doublecolon.function.TriFunction;
 import org.junit.After;
 import org.junit.Assert;
 import org.junit.Before;
@@ -9,7 +9,7 @@ import org.junit.Test;
 import java.util.*;
 import java.util.function.BiFunction;
 
-import static com.baeldung.doublecolumn.ComputerUtils.*;
+import static com.baeldung.doublecolon.ComputerUtils.*;
 
 public class TestComputerUtils {
 
@@ -22,7 +22,7 @@ public class TestComputerUtils {
     }
 
     @Test
-    public void testFilter() {
+    public void testConstructorReference() {
 
         Computer c1 = new Computer(2015, "white");
         Computer c2 = new Computer(2009, "black");
@@ -53,7 +53,7 @@ public class TestComputerUtils {
     }
 
     @Test
-    public void testRepair() {
+    public void testStaticMethodReference() {
 
         Computer c1 = new Computer(2015, "white", 35);
         Computer c2 = new Computer(2009, "black", 65);
@@ -66,4 +66,24 @@ public class TestComputerUtils {
         Assert.assertEquals("Computer repaired", new Integer(100), c1.getHealty());
     }
 
+    @Test
+    public void testInstanceMethodArbitraryObjectParticularType() {
+
+        Computer c1 = new Computer(2015, "white", 35);
+        Computer c2 = new MacbookPro(2009, "black", 65);
+        List<Computer> inventory = Arrays.asList(c1, c2);
+        inventory.forEach(Computer::turnOnPc);
+
+    }
+
+    @Test
+    public void testSuperMethodReference() {
+
+        final TriFunction<Integer, String, Integer, MacbookPro> integerStringIntegerObjectTriFunction = MacbookPro::new;
+        final MacbookPro macbookPro = integerStringIntegerObjectTriFunction.apply(2010, "black",100);
+        Double initialValue=new Double(999.99);
+        final Double actualValue = macbookPro.calculateValue(initialValue);
+        Assert.assertEquals(766.659, actualValue,0.0);
+    }
+
 }