update load balancer directory name

implementations/java/load_balancing_algorithms/RoundRobin.java

@@ -0,0 +1,26 @@
+import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
+
+public class RoundRobin {
+    private List<String> servers;
+    private AtomicInteger index;
+
+    public RoundRobin(List<String> servers) {
+        this.servers = servers;
+        this.index = new AtomicInteger(-1);
+    }
+
+    public String getNextServer() {
+        int currentIndex = index.incrementAndGet() % servers.size();
+        return servers.get(currentIndex);
+    }
+
+    public static void main(String[] args) {
+        List<String> servers = List.of("Server1", "Server2", "Server3");
+        RoundRobin roundRobinLB = new RoundRobin(servers);
+
+        for (int i = 0; i < 6; i++) {
+            System.out.println(roundRobinLB.getNextServer());
+        }
+    }
+}