Index: applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/Coordinate.java
===================================================================
--- applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/Coordinate.java	(revision 34177)
+++ applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/Coordinate.java	(revision 34616)
@@ -20,4 +20,9 @@
     private transient Point2D.Double data;
 
+    /**
+     * Constructs a new {@code Coordinate}.
+     * @param lat latitude in degrees
+     * @param lon longitude in degrees
+     */
     public Coordinate(double lat, double lon) {
         data = new Point2D.Double(lon, lat);
@@ -62,19 +67,15 @@
     @Override
     public int hashCode() {
-        int hash = 3;
-        hash = 61 * hash + Objects.hashCode(this.data);
-        return hash;
+        return Objects.hashCode(data);
     }
 
     @Override
     public boolean equals(Object obj) {
-        if (obj == null) {
+        if (this == obj)
+            return true;
+        if (obj == null || !(obj instanceof Coordinate))
             return false;
-        }
-        if (getClass() != obj.getClass()) {
-            return false;
-        }
         final Coordinate other = (Coordinate) obj;
-        return Objects.equals(this.data, other.data);
+        return Objects.equals(data, other.data);
     }
 }
Index: applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/Projected.java
===================================================================
--- applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/Projected.java	(revision 34177)
+++ applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/Projected.java	(revision 34616)
@@ -53,20 +53,15 @@
     @Override
     public int hashCode() {
-        int hash = 3;
-        hash = 61 * hash + Objects.hashCode(this.data);
-        return hash;
+        return Objects.hashCode(data);
     }
 
     @Override
     public boolean equals(Object obj) {
-        if (obj == null) {
+        if (this == obj)
+            return true;
+        if (obj == null || !(obj instanceof Projected))
             return false;
-        }
-        if (getClass() != obj.getClass()) {
-            return false;
-        }
         final Projected other = (Projected) obj;
-        return Objects.equals(this.data, other.data);
+        return Objects.equals(data, other.data);
     }
 }
-
Index: applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/Tile.java
===================================================================
--- applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/Tile.java	(revision 34177)
+++ applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/Tile.java	(revision 34616)
@@ -10,4 +10,5 @@
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Objects;
 import java.util.concurrent.Callable;
 
@@ -340,16 +341,11 @@
         if (this == obj)
             return true;
-        if (obj == null)
+        if (obj == null || !(obj instanceof Tile))
             return false;
-        if (getClass() != obj.getClass())
-            return false;
-        Tile other = (Tile) obj;
-        if (xtile != other.xtile)
-            return false;
-        if (ytile != other.ytile)
-            return false;
-        if (zoom != other.zoom)
-            return false;
-        return getTileSource().equals(other.getTileSource());
+        final Tile other = (Tile) obj;
+        return xtile == other.xtile
+            && ytile == other.ytile
+            && zoom == other.zoom
+            && Objects.equals(source, other.source);
     }
 
@@ -460,4 +456,3 @@
         loaded = false;
     }
-
 }
Index: applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/interfaces/ICoordinate.java
===================================================================
--- applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/interfaces/ICoordinate.java	(revision 34177)
+++ applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/interfaces/ICoordinate.java	(revision 34616)
@@ -2,12 +2,31 @@
 package org.openstreetmap.gui.jmapviewer.interfaces;
 
+/**
+ * Latitude/Longitude coordinates.
+ */
 public interface ICoordinate {
 
+    /**
+     * Returns latitude.
+     * @return latitude in degrees
+     */
     double getLat();
 
+    /**
+     * Sets latitude.
+     * @param lat latitude in degrees
+     */
     void setLat(double lat);
 
+    /**
+     * Returns longitude.
+     * @return longitude in degrees
+     */
     double getLon();
 
+    /**
+     * Sets longitude.
+     * @param lon longitude in degrees
+     */
     void setLon(double lon);
 }
Index: applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/tilesources/ScanexTileSource.java
===================================================================
--- applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/tilesources/ScanexTileSource.java	(revision 34177)
+++ applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/tilesources/ScanexTileSource.java	(revision 34616)
@@ -190,5 +190,5 @@
             ec * Math.pow(Math.tan(Math.PI/4 + Math.asin(E * sinl)/2), E);
         double df = 1/(1 - sinl) - ec * E * cosl/((1 - E * sinl) *
-            (Math.sqrt(1 - E * E * sinl * sinl)));
+            Math.sqrt(1 - E * E * sinl * sinl));
 
         return f/df;