diff --git a/src/lab4/Furniture.java b/src/lab4/Furniture.java
index d8dce60..dcabc47 100644
--- a/src/lab4/Furniture.java
+++ b/src/lab4/Furniture.java
@@ -5,7 +5,7 @@ package lab4;
 // * My class Furniture.
 // */
 //todo uncomment /*<Furniture>*/
-public /*abstract*/ class Furniture/*<T>*/ implements Comparable/*<Furniture>*/{
+public /*abstract*/ class Furniture/*<T>*/ implements Comparable<Furniture> {
     /**
      *
      */
@@ -22,7 +22,6 @@ public /*abstract*/ class Furniture/*<T>*/ implements Comparable/*<Furniture>*/{
 //    }
 
     /**
-     *
      * @param material
      * @param length
      * @param height
@@ -77,9 +76,18 @@ public /*abstract*/ class Furniture/*<T>*/ implements Comparable/*<Furniture>*/{
                 '}';
     }
 
+//    @Override
+//    public int compareTo(Object o) {
+//        return /*this.*/price - ((Furniture) o).price;
+////        return /*this.*/material.compareTo(((Furniture) o).material);
+//    }
+
     @Override
-    public int compareTo(Object o) {
-        return /*this.*/price - ((Furniture) o).price;
-//        return /*this.*/material.compareTo(((Furniture) o).material);
+    public int compareTo(Furniture o) {
+        final int priceDifference = price - o.price;
+        return priceDifference != 0
+                ? priceDifference
+//                : -material.compareTo(o.material);
+                : o.material.compareTo(material);
     }
 }
diff --git a/src/lab4/Main.java b/src/lab4/Main.java
index 76c1ce9..a4dc7fc 100644
--- a/src/lab4/Main.java
+++ b/src/lab4/Main.java
@@ -1,18 +1,18 @@
 package lab4;
 
 import java.util.Arrays;
+import java.util.Comparator;
 
 public class Main {
     public static void main(String[] args) {
         System.out.println(Integer.MIN_VALUE - 1);
-//        todo Comparable
         //todo equals+hashcode
 //        todo JavaDoc
         final Furniture/*<Furniture>*/ furniture1 = new Furniture("A", 1, 1, 1, 1);
         final Furniture/*<String>*/ furniture2 = new Furniture("F", 1, 1, 1, 4);
 
         System.out.println(furniture1.compareTo(furniture2));
-        System.out.println(furniture1.compareTo("furniture2"));
+//        System.out.println(furniture1.compareTo("furniture2"));
 
         Furniture[] furnitureArray = {
                 furniture1,
@@ -46,5 +46,39 @@ public class Main {
         }
 
         System.out.println("+++++++++++++");
+
+        /*Arrays.sort(furnitureArray);
+        for (Furniture furniture : furnitureArray) {
+            System.out.println(furniture);
+        }
+
+        System.out.println("+++++++++++++");*/
+
+        /*Arrays.sort(furnitureArray, new PriceFurnitureComparator());
+        for (Furniture furniture : furnitureArray) {
+            System.out.println(furniture);
+        }
+
+        System.out.println("+++++++++++++");*/
+
+        /*Arrays.sort(furnitureArray, new Comparator<Furniture>() {
+            @Override
+            public int compare(Furniture o1, Furniture o2) {
+                return o1.getMaterial().compareTo(o2.getMaterial());
+            }
+        });*/
+//        Arrays.sort(furnitureArray, (o1, o2) -> o1.getMaterial().compareTo(o2.getMaterial()));
+//        Arrays.sort(furnitureArray, Comparator.comparing(Furniture::getMaterial));
+//        Arrays.sort(furnitureArray, Comparator.comparing(Furniture::getMaterial).reversed());
+//        Arrays.sort(furnitureArray, Comparator.comparing(Furniture::getPrice)
+//        .thenComparing(Furniture::getMaterial).reversed());
+        Arrays.sort(furnitureArray, Comparator.comparing(Furniture::getPrice)
+                .thenComparing(Comparator.comparing(Furniture::getMaterial).reversed()));
+
+        for (Furniture furniture : furnitureArray) {
+            System.out.println(furniture);
+        }
+
+        System.out.println("+++++++++++++");
     }
 }
diff --git a/src/lab4/MaterialFurnitureComparator.java b/src/lab4/MaterialFurnitureComparator.java
new file mode 100644
index 0000000..3152d50
--- /dev/null
+++ b/src/lab4/MaterialFurnitureComparator.java
@@ -0,0 +1,11 @@
+package lab4;
+
+import java.util.Comparator;
+
+public class MaterialFurnitureComparator implements Comparator<Furniture> {
+
+    @Override
+    public int compare(Furniture o1, Furniture o2) {
+        return o1.getMaterial().compareTo(o2.getMaterial());
+    }
+}
diff --git a/src/lab4/PriceFurnitureComparator.java b/src/lab4/PriceFurnitureComparator.java
new file mode 100644
index 0000000..62e0e37
--- /dev/null
+++ b/src/lab4/PriceFurnitureComparator.java
@@ -0,0 +1,11 @@
+package lab4;
+
+import java.util.Comparator;
+
+public class PriceFurnitureComparator implements Comparator<Furniture> {
+
+    @Override
+    public int compare(Furniture o1, Furniture o2) {
+        return o1.getPrice() - o2.getPrice();
+    }
+}