update load balancer directory name

implementations/java/load_balancing_algorithms/WeightedRoundRobin.java

@@ -0,0 +1,44 @@
+import java.util.List;
+
+public class WeightedRoundRobin {
+    private List<String> servers;
+    private List<Integer> weights;
+    private int currentIndex;
+    private int currentWeight;
+
+    public WeightedRoundRobin(List<String> servers, List<Integer> weights) {
+        this.servers = servers;
+        this.weights = weights;
+        this.currentIndex = -1;
+        this.currentWeight = 0;
+    }
+
+    public String getNextServer() {
+        while (true) {
+            currentIndex = (currentIndex + 1) % servers.size();
+            if (currentIndex == 0) {
+                currentWeight--;
+                if (currentWeight <= 0) {
+                    currentWeight = getMaxWeight();
+                }
+            }
+            if (weights.get(currentIndex) >= currentWeight) {
+                return servers.get(currentIndex);
+            }
+        }
+    }
+
+    private int getMaxWeight() {
+        return weights.stream().max(Integer::compare).orElse(0);
+    }
+
+    public static void main(String[] args) {
+        List<String> servers = List.of("Server1", "Server2", "Server3");
+        List<Integer> weights = List.of(5, 1, 1);
+        WeightedRoundRobin weightedRoundRobinLB = new WeightedRoundRobin(servers, weights);
+
+        for (int i = 0; i < 7; i++) {
+            System.out.println(weightedRoundRobinLB.getNextServer());
+        }
+    }
+}