created and added an BFS algorithm folder and added the algorithm too

Java/Algorithm/Breadth-First Search (BFS)/BFS.java

@@ -0,0 +1,36 @@
+import java.util.*;
+
+public class BFS {
+    public static void bfs(Map<Integer, List<Integer>> graph, int start) {
+        Queue<Integer> queue = new LinkedList<>();
+        Set<Integer> visited = new HashSet<>();
+
+        queue.offer(start);
+        visited.add(start);
+
+        while (!queue.isEmpty()) {
+            int node = queue.poll();
+            System.out.print(node + " ");
+
+            List<Integer> neighbors = graph.getOrDefault(node, new ArrayList<>());
+            for (int neighbor : neighbors) {
+                if (!visited.contains(neighbor)) {
+                    queue.offer(neighbor);
+                    visited.add(neighbor);
+                }
+            }
+        }
+    }
+
+    public static void main(String[] args) {
+        Map<Integer, List<Integer>> graph = new HashMap<>();
+        graph.put(0, Arrays.asList(1, 2));
+        graph.put(1, Arrays.asList(3, 4));
+        graph.put(2, Arrays.asList(5));
+        graph.put(3, new ArrayList<>());
+        graph.put(4, new ArrayList<>());
+        graph.put(5, new ArrayList<>());
+
+        bfs(graph, 0);
+    }
+}