Make use of Objects.hashCode() present in Java7 and remove Utils.hashCode()

h2/src/main/org/h2/table/TableLinkConnection.java

@@ -8,10 +8,10 @@ package org.h2.table;
 import java.sql.Connection;
 import java.sql.SQLException;
 import java.util.HashMap;
+import java.util.Objects;
 import org.h2.message.DbException;
 import org.h2.util.JdbcUtils;
 import org.h2.util.StringUtils;
-import org.h2.util.Utils;
 
 /**
  * A connection for a linked table. The same connection may be used for multiple
@@ -95,10 +95,10 @@ public class TableLinkConnection {
 
     @Override
     public int hashCode() {
-        return Utils.hashCode(driver)
-                ^ Utils.hashCode(url)
-                ^ Utils.hashCode(user)
-                ^ Utils.hashCode(password);
+        return Objects.hashCode(driver)
+                ^ Objects.hashCode(url)
+                ^ Objects.hashCode(user)
+                ^ Objects.hashCode(password);
     }
 
     @Override

h2/src/main/org/h2/util/Utils.java

@@ -270,16 +270,6 @@ public class Utils {
         return copy;
     }
 
-    /**
-     * Calculate the hash code of the given object. The object may be null.
-     *
-     * @param o the object
-     * @return the hash code, or 0 if the object is null
-     */
-    public static int hashCode(Object o) {
-        return o == null ? 0 : o.hashCode();
-    }
-
     /**
      * Get the used memory in KB.
      * This method possibly calls System.gc().