Fix checkstyle reported errors

maven-artifact/src/main/java/org/apache/maven/artifact/versioning/VersionRange.java

@@ -593,11 +593,8 @@ public class VersionRange
         }
         VersionRange other = (VersionRange) obj;
 
-        boolean equals =
+        return Objects.equals( recommendedVersion, other.recommendedVersion )
-                Objects.equals(recommendedVersion, other.recommendedVersion);
+            && Objects.equals( restrictions, other.restrictions );
-        equals &=
-                Objects.equals(restrictions, other.restrictions);
-        return equals;
     }
 
     public int hashCode()

maven-core/src/main/java/org/apache/maven/artifact/resolver/filter/ScopeArtifactFilter.java

@@ -69,12 +69,7 @@ public class ScopeArtifactFilter
 
         ScopeArtifactFilter other = (ScopeArtifactFilter) obj;
 
-        return equals( scope, other.scope );
+        return Objects.equals( scope, other.scope );
-    }
-
-    private static <T> boolean equals( T str1, T str2 )
-    {
-        return Objects.equals(str1, str2);
     }
 
 }

maven-core/src/main/java/org/apache/maven/plugin/DefaultPluginDescriptorCache.java

@@ -194,9 +194,11 @@ public class DefaultPluginDescriptorCache
 
             CacheKey that = (CacheKey) obj;
 
-            return eq( this.artifactId, that.artifactId ) && eq( this.groupId, that.groupId )
+            return Objects.equals( this.artifactId, that.artifactId ) 
-                && eq( this.version, that.version ) && eq( this.localRepo, that.localRepo )
+                && Objects.equals( this.groupId, that.groupId )
-                && eq( this.workspace, that.workspace )
+                && Objects.equals( this.version, that.version ) 
+                && Objects.equals( this.localRepo, that.localRepo )
+                && Objects.equals( this.workspace, that.workspace )
                 && RepositoryUtils.repositoriesEquals( this.repositories, that.repositories );
         }
 
@@ -211,11 +213,6 @@ public class DefaultPluginDescriptorCache
             return obj != null ? obj.hashCode() : 0;
         }
 
-        private static <T> boolean eq( T s1, T s2 )
-        {
-            return Objects.equals(s1, s2);
-        }
-
     }
 
 }

maven-core/src/main/java/org/apache/maven/project/MavenProject.java

@@ -1056,13 +1056,9 @@ public class MavenProject
 
         MavenProject that = (MavenProject) other;
 
-        return eq( getArtifactId(), that.getArtifactId() ) && eq( getGroupId(), that.getGroupId() )
+        return Objects.equals( getArtifactId(), that.getArtifactId() )
-            && eq( getVersion(), that.getVersion() );
+            && Objects.equals( getGroupId(), that.getGroupId() ) 
-    }
+            && Objects.equals( getVersion(), that.getVersion() );
-
-    private static <T> boolean eq( T s1, T s2 )
-    {
-        return Objects.equals(s1, s2);
     }
 
     @Override

maven-core/src/main/java/org/apache/maven/project/artifact/DefaultMavenMetadataCache.java

@@ -133,13 +133,13 @@ public class DefaultMavenMetadataCache
             return true;
         }
 
-        return eq( a1.getGroupId(), a2.getGroupId() )
+        return Objects.equals( a1.getGroupId(), a2.getGroupId() )
-            && eq( a1.getArtifactId(), a2.getArtifactId() )
+            && Objects.equals( a1.getArtifactId(), a2.getArtifactId() )
-            && eq( a1.getType(), a2.getType() )
+            && Objects.equals( a1.getType(), a2.getType() )
-            && eq( a1.getVersion(), a2.getVersion() )
+            && Objects.equals( a1.getVersion(), a2.getVersion() )
-            && eq( a1.getClassifier(), a2.getClassifier() )
+            && Objects.equals( a1.getClassifier(), a2.getClassifier() )
-            && eq( a1.getScope(), a2.getScope() )
+            && Objects.equals( a1.getScope(), a2.getScope() )
-            && eq( a1.getDependencyFilter(), a2.getDependencyFilter() )
+            && Objects.equals( a1.getDependencyFilter(), a2.getDependencyFilter() )
             && a1.isOptional() == a2.isOptional();
     }
 
@@ -167,7 +167,8 @@ public class DefaultMavenMetadataCache
             return true;
         }
 
-        return eq( r1.getId(), r2.getId() ) && eq( r1.getUrl(), r2.getUrl() )
+        return Objects.equals( r1.getId(), r2.getId() )
+            && Objects.equals( r1.getUrl(), r2.getUrl() )
             && repositoryPolicyEquals( r1.getReleases(), r2.getReleases() )
             && repositoryPolicyEquals( r1.getSnapshots(), r2.getSnapshots() );
     }
@@ -179,7 +180,7 @@ public class DefaultMavenMetadataCache
             return true;
         }
 
-        return p1.isEnabled() == p2.isEnabled() && eq( p1.getUpdatePolicy(), p2.getUpdatePolicy() );
+        return p1.isEnabled() == p2.isEnabled() && Objects.equals( p1.getUpdatePolicy(), p2.getUpdatePolicy() );
     }
 
     private static boolean repositoriesEquals( List<ArtifactRepository> r1, List<ArtifactRepository> r2 )
@@ -200,11 +201,6 @@ public class DefaultMavenMetadataCache
         return true;
     }
 
-    private static <T> boolean eq( T s1, T s2 )
-    {
-        return Objects.equals(s1, s2);
-    }
-
     /**
      * CacheRecord
      */

maven-core/src/main/java/org/apache/maven/toolchain/DefaultToolchain.java

@@ -146,12 +146,7 @@ public abstract class DefaultToolchain // should have been AbstractToolchain...
         Properties thisProvides = this.getModel().getProvides();
         Properties otherProvides = other.getModel().getProvides();
 
-        if (!Objects.equals(thisProvides, otherProvides))
+        return Objects.equals( thisProvides, otherProvides );
-        {
-            return false;
-        }
-
-        return true;
     }
 
     @Override