Work on #403, removed checkstyle violations

promise/src/main/java/com/iluwatar/promise/App.java

@@ -15,7 +15,7 @@ public class App {
    * Program entry point
    * @param args arguments
    * @throws InterruptedException if main thread is interruped.
-   * @throws ExecutionException 
+   * @throws ExecutionException if an execution error occurs.
    */
   public static void main(String[] args) throws InterruptedException, ExecutionException {
     ExecutorService executor = Executors.newSingleThreadExecutor();

promise/src/main/java/com/iluwatar/promise/Promise.java

@@ -3,9 +3,6 @@ package com.iluwatar.promise;
 import java.util.concurrent.Callable;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Executor;
-import java.util.concurrent.Future;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.TimeoutException;
 import java.util.function.Consumer;
 import java.util.function.Function;
 
@@ -147,96 +144,4 @@ public class Promise<T> extends PromiseSupport<T> {
       }
     }
   }
-}
-
-
-/**
- * A really simplified implementation of future that allows completing it successfully with a value 
- * or exceptionally with an exception.
- */
-class PromiseSupport<T> implements Future<T> {
-
-  static final int RUNNING = 1;
-  static final int FAILED = 2;
-  static final int COMPLETED = 3;
-
-  final Object lock;
-
-  volatile int state = RUNNING;
-  T value;
-  Exception exception;
-
-  PromiseSupport() {
-    this.lock = new Object();
-  }
-
-  void fulfill(T value) {
-    this.value = value;
-    this.state = COMPLETED;
-    synchronized (lock) {
-      lock.notifyAll();
-    }
-  }
-
-  void fulfillExceptionally(Exception exception) {
-    this.exception = exception;
-    this.state = FAILED;
-    synchronized (lock) {
-      lock.notifyAll();
-    }
-  }
-
-  @Override
-  public boolean cancel(boolean mayInterruptIfRunning) {
-    return false;
-  }
-
-  @Override
-  public boolean isCancelled() {
-    return false;
-  }
-
-  @Override
-  public boolean isDone() {
-    return state > RUNNING;
-  }
-
-  @Override
-  public T get() throws InterruptedException, ExecutionException {
-    if (state == COMPLETED) {
-      return value;
-    } else if (state == FAILED) {
-      throw new ExecutionException(exception);
-    } else {
-      synchronized (lock) {
-        lock.wait();
-        if (state == COMPLETED) {
-          return value;
-        } else {
-          throw new ExecutionException(exception);
-        }
-      }
-    }
-  }
-
-  @Override
-  public T get(long timeout, TimeUnit unit)
-      throws InterruptedException, ExecutionException, TimeoutException {
-    if (state == COMPLETED) {
-      return value;
-    } else if (state == FAILED) {
-      throw new ExecutionException(exception);
-    } else {
-      synchronized (lock) {
-        lock.wait(unit.toMillis(timeout));
-        if (state == COMPLETED) {
-          return value;
-        } else if (state == FAILED) {
-          throw new ExecutionException(exception);
-        } else {
-          throw new TimeoutException();
-        }
-      }
-    }
-  }
 }

promise/src/test/java/com/iluwatar/promise/PromiseTest.java

@@ -58,7 +58,8 @@ public class PromiseTest {
       @Override
       public Integer call() throws Exception {
         throw new RuntimeException("Barf!");
-      }}, executor);
+      }
+    }, executor);
     
     try {
       promise.get();
@@ -85,7 +86,8 @@ public class PromiseTest {
       @Override
       public Integer call() throws Exception {
         throw new RuntimeException("Barf!");
-      }}, executor);
+      }
+    }, executor);
     
     try {
       promise.get(1000, TimeUnit.SECONDS);