diff --git a/trampoline/src/main/java/com/iluwatar/trampoline/Trampoline.java b/trampoline/src/main/java/com/iluwatar/trampoline/Trampoline.java
index 8a02e246b..277ae9ffb 100644
--- a/trampoline/src/main/java/com/iluwatar/trampoline/Trampoline.java
+++ b/trampoline/src/main/java/com/iluwatar/trampoline/Trampoline.java
@@ -2,83 +2,84 @@ package com.iluwatar.trampoline;
 
 import java.util.stream.Stream;
 
-/**<p>Trampoline pattern allows to define recursive algorithms by iterative loop </p>
+/**
+ * <p>Trampoline pattern allows to define recursive algorithms by iterative loop </p>
  * <p>When get is called on the returned Trampoline, internally it will iterate calling ‘jump’
- on the returned Trampoline as long as the concrete instance returned is {@link #more(Trampoline)},
- stopping once the returned instance is {@link #done(Object)}.</p>
- <p>Essential we convert looping via recursion into iteration,
- the key enabling mechanism is the fact that {@link #more(Trampoline)} is a lazy operation.</p>
-*/
-
-public interface Trampoline<T>  {
-    T get();
+ * on the returned Trampoline as long as the concrete instance returned is {@link #more(Trampoline)},
+ * stopping once the returned instance is {@link #done(Object)}.</p>
+ * <p>Essential we convert looping via recursion into iteration,
+ * the key enabling mechanism is the fact that {@link #more(Trampoline)} is a lazy operation.</p>
+ *
+ * @param <T> is  type for returning result.
+ */
+public interface Trampoline<T> {
+  T get();
 
 
-    /**
-     * @return next stage
-     */
-    default Trampoline<T> jump() {
-        return this;
-    }
+  /**
+   * @return next stage
+   */
+  default Trampoline<T> jump() {
+    return this;
+  }
 
 
-    default T result() {
-        return get();
-    }
+  default T result() {
+    return get();
+  }
 
-    /**
-     * @return true if complete
-     *
-     */
-    default boolean complete() {
-        return true;
-    }
+  /**
+   * @return true if complete
+   */
+  default boolean complete() {
+    return true;
+  }
 
-    /**
-     * Created a completed Trampoline
-     *
-     * @param result Completed result
-     * @return Completed Trampoline
-     */
-    static <T> Trampoline<T> done(final T result) {
-        return () -> result;
-    }
+  /**
+   * Created a completed Trampoline
+   *
+   * @param result Completed result
+   * @return Completed Trampoline
+   */
+  static <T> Trampoline<T> done(final T result) {
+    return () -> result;
+  }
 
 
-    /**
-     * Create a Trampoline that has more work to do
-     *
-     * @param trampoline Next stage in Trampoline
-     * @return Trampoline with more work
-     */
-    static <T> Trampoline<T> more(final Trampoline<Trampoline<T>> trampoline) {
-        return new Trampoline<T>() {
-            @Override
-            public boolean complete() {
-                return false;
-            }
+  /**
+   * Create a Trampoline that has more work to do
+   *
+   * @param trampoline Next stage in Trampoline
+   * @return Trampoline with more work
+   */
+  static <T> Trampoline<T> more(final Trampoline<Trampoline<T>> trampoline) {
+    return new Trampoline<T>() {
+      @Override
+      public boolean complete() {
+        return false;
+      }
 
-            @Override
-            public Trampoline<T> jump() {
-                return trampoline.result();
-            }
+      @Override
+      public Trampoline<T> jump() {
+        return trampoline.result();
+      }
 
-            @Override
-            public T get() {
-                return trampoline(this);
-            }
+      @Override
+      public T get() {
+        return trampoline(this);
+      }
 
-            T trampoline(final Trampoline<T> trampoline) {
+      T trampoline(final Trampoline<T> trampoline) {
 
-                return Stream.iterate(trampoline, Trampoline::jump)
-                        .filter(Trampoline::complete)
-                        .findFirst()
-                        .get()
-                        .result();
+        return Stream.iterate(trampoline, Trampoline::jump)
+            .filter(Trampoline::complete)
+            .findFirst()
+            .get()
+            .result();
 
-            }
-        };
-    }
+      }
+    };
+  }
 
 
 }
diff --git a/trampoline/src/main/java/com/iluwatar/trampoline/TrampolineApp.java b/trampoline/src/main/java/com/iluwatar/trampoline/TrampolineApp.java
index 73222ddf5..76e3ed3da 100644
--- a/trampoline/src/main/java/com/iluwatar/trampoline/TrampolineApp.java
+++ b/trampoline/src/main/java/com/iluwatar/trampoline/TrampolineApp.java
@@ -31,24 +31,28 @@ import lombok.extern.slf4j.Slf4j;
  * <p>it is possible to implement algorithms recursively in Java without blowing the stack
  * and to interleave the execution of functions without hard coding them together or even using threads.</p>
  */
-
 @Slf4j
 public class TrampolineApp {
-    public static void main(String[] args) {
-        log.info("start pattern");
-        Integer result = loop(10, 1).result();
-        log.info("result {}", result);
 
-    }
+  /**
+   * Main program for showing pattern. It does loop with factorial function.
+   * */
+  public static void main(String[] args) {
+    log.info("start pattern");
+    Integer result = loop(10, 1).result();
+    log.info("result {}", result);
 
-    /**
-     * Manager for pattern. Define it with a factorial function.
-     * */
-    public static Trampoline<Integer> loop(int times, int prod) {
-        if (times == 0)
-            return Trampoline.done(prod);
-        else
-            return Trampoline.more(() -> loop(times - 1, prod * times));
+  }
+
+  /**
+   * Manager for pattern. Define it with a factorial function.
+   */
+  public static Trampoline<Integer> loop(int times, int prod) {
+    if (times == 0) {
+      return Trampoline.done(prod);
+    } else {
+      return Trampoline.more(() -> loop(times - 1, prod * times));
     }
+  }
 
 }
diff --git a/trampoline/src/test/java/com/iluwatar/trampoline/TrampolineAppTest.java b/trampoline/src/test/java/com/iluwatar/trampoline/TrampolineAppTest.java
index 9765131d5..553e583e1 100644
--- a/trampoline/src/test/java/com/iluwatar/trampoline/TrampolineAppTest.java
+++ b/trampoline/src/test/java/com/iluwatar/trampoline/TrampolineAppTest.java
@@ -6,13 +6,17 @@ import java.io.IOException;
 
 import static org.junit.Assert.*;
 
+
+/**
+ * Test for trampoline pattern.
+ * */
 public class TrampolineAppTest {
 
 
-    @Test
-    public void testTrampolineWithFactorialFunction()throws IOException{
-        int result = TrampolineApp.loop(10, 1).result();
-        assertEquals("Be equal",3628800,result);
-    }
+  @Test
+  public void testTrampolineWithFactorialFunction() throws IOException {
+    int result = TrampolineApp.loop(10, 1).result();
+    assertEquals("Be equal", 3628800, result);
+  }
 
 }
\ No newline at end of file