diff --git a/labs/lab4/BandBooster.class b/labs/lab4/BandBooster.class
new file mode 100644
index 0000000..2d08f31
Binary files /dev/null and b/labs/lab4/BandBooster.class differ
diff --git a/labs/lab4/BandBooster.java b/labs/lab4/BandBooster.java
new file mode 100644
index 0000000..06038c2
--- /dev/null
+++ b/labs/lab4/BandBooster.java
@@ -0,0 +1,21 @@
+public class BandBooster {
+    private String name;
+    private int boxesSold;
+
+    public BandBooster (String name) {
+        this.name = name;
+        this.boxesSold = 0;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void updateSales (int addBox) {
+        boxesSold = boxesSold + addBox;
+    }
+
+    public String toString() {
+        return name + " sold:  " + boxesSold + " boxes!";
+    }
+}
\ No newline at end of file
diff --git a/labs/lab4/BandSale.java b/labs/lab4/BandSale.java
new file mode 100644
index 0000000..3b9cd16
--- /dev/null
+++ b/labs/lab4/BandSale.java
@@ -0,0 +1,27 @@
+import java.util.*;
+
+public class BandSale {
+    public static void main(String[] args) {
+    Scanner scan = new Scanner(System.in);
+    
+    System.out.println("Enter band name 1 !");
+    String band1N = scan.next();
+    BandBooster band1, band2;
+    band1 = new BandBooster(band1N);
+    
+    System.out.println("Enter band name 2 !");
+    String band2N = scan.next();
+    band2 = new BandBooster(band2N);
+
+    System.out.println("Enter "+band1.getName()+" box number!");
+    int box1 = scan.nextInt();
+    band1.updateSales(box1);
+
+    System.out.println("Enter "+band2.getName()+" box number!");
+    int box2 = scan.nextInt();
+    band2.updateSales(box2);
+
+    System.out.println(band1.toString());
+    System.out.println(band2.toString());
+    }
+} 
\ No newline at end of file