diff --git a/core-java-8/src/main/java/com/baeldung/AdderImpl.java b/core-java-8/src/main/java/com/baeldung/AdderImpl.java
index 5109f3aaba..f67cdc26b3 100644
--- a/core-java-8/src/main/java/com/baeldung/AdderImpl.java
+++ b/core-java-8/src/main/java/com/baeldung/AdderImpl.java
@@ -6,12 +6,12 @@ import java.util.function.Function;
 public class AdderImpl implements Adder {
 
     @Override
-    public String addWithFunction(Function<String, String> f) {
+    public String addWithFunction(final Function<String, String> f) {
         return f.apply("Something ");
     }
 
     @Override
-    public void addWithConsumer(Consumer<Integer> f) {
+    public void addWithConsumer(final Consumer<Integer> f) {
     }
 
 }
diff --git a/core-java-8/src/main/java/com/baeldung/doublecolumn/Computer.java b/core-java-8/src/main/java/com/baeldung/doublecolumn/Computer.java
index cd201eef5f..18867a2354 100644
--- a/core-java-8/src/main/java/com/baeldung/doublecolumn/Computer.java
+++ b/core-java-8/src/main/java/com/baeldung/doublecolumn/Computer.java
@@ -6,12 +6,12 @@ public class Computer {
     private String color;
     private Integer healty;
 
-    public Computer(int age, String color) {
+    public Computer(final int age, final String color) {
         this.age = age;
         this.color = color;
     }
 
-    public Computer(Integer age, String color, Integer healty) {
+    public Computer(final Integer age, final String color, final Integer healty) {
         this.age = age;
         this.color = color;
         this.healty = healty;
@@ -24,7 +24,7 @@ public class Computer {
         return age;
     }
 
-    public void setAge(Integer age) {
+    public void setAge(final Integer age) {
         this.age = age;
     }
 
@@ -32,7 +32,7 @@ public class Computer {
         return color;
     }
 
-    public void setColor(String color) {
+    public void setColor(final String color) {
         this.color = color;
     }
 
@@ -40,7 +40,7 @@ public class Computer {
         return healty;
     }
 
-    public void setHealty(Integer healty) {
+    public void setHealty(final Integer healty) {
         this.healty = healty;
     }
 
@@ -50,16 +50,19 @@ public class Computer {
     }
 
     @Override
-    public boolean equals(Object o) {
-        if (this == o)
+    public boolean equals(final Object o) {
+        if (this == o) {
             return true;
-        if (o == null || getClass() != o.getClass())
+        }
+        if (o == null || getClass() != o.getClass()) {
             return false;
+        }
 
-        Computer computer = (Computer) o;
+        final Computer computer = (Computer) o;
 
-        if (age != null ? !age.equals(computer.age) : computer.age != null)
+        if (age != null ? !age.equals(computer.age) : computer.age != null) {
             return false;
+        }
         return color != null ? color.equals(computer.color) : computer.color == null;
 
     }
diff --git a/core-java-8/src/main/java/com/baeldung/doublecolumn/ComputerUtils.java b/core-java-8/src/main/java/com/baeldung/doublecolumn/ComputerUtils.java
index bdd3675a6d..5c255313a7 100644
--- a/core-java-8/src/main/java/com/baeldung/doublecolumn/ComputerUtils.java
+++ b/core-java-8/src/main/java/com/baeldung/doublecolumn/ComputerUtils.java
@@ -1,24 +1,24 @@
 package com.baeldung.doublecolumn;
 
-import com.baeldung.doublecolumn.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);
     public static final ComputerPredicate blackPredicate = (c) -> "black".equals(c.getColor());
 
-    public static List<Computer> filter(List<Computer> inventory, ComputerPredicate p) {
+    public static List<Computer> filter(final List<Computer> inventory, final ComputerPredicate p) {
 
-        List<Computer> result = new ArrayList<>();
+        final List<Computer> result = new ArrayList<>();
         inventory.stream().filter(p::filter).forEach(result::add);
 
         return result;
     }
 
-    public static void repair(Computer computer) {
+    public static void repair(final Computer computer) {
         if (computer.getHealty() < 50) {
             computer.setHealty(100);
         }
diff --git a/core-java-8/src/main/java/com/baeldung/doublecolumn/function/TriFunction.java b/core-java-8/src/main/java/com/baeldung/doublecolumn/function/TriFunction.java
index 50aa85c0b2..1fb13b9ced 100644
--- a/core-java-8/src/main/java/com/baeldung/doublecolumn/function/TriFunction.java
+++ b/core-java-8/src/main/java/com/baeldung/doublecolumn/function/TriFunction.java
@@ -8,8 +8,8 @@ public interface TriFunction<A, B, C, R> {
 
     R apply(A a, B b, C c);
 
-    default <V> TriFunction<A, B, C, V> andThen(Function<? super R, ? extends V> after) {
+    default <V> TriFunction<A, B, C, V> andThen(final Function<? super R, ? extends V> after) {
         Objects.requireNonNull(after);
-        return (A a, B b, C c) -> after.apply(apply(a, b, c));
+        return (final A a, final B b, final C c) -> after.apply(apply(a, b, c));
     }
 }
\ No newline at end of file