Adding DFS in java

java/searching/DFS.java

@@ -0,0 +1,40 @@
+import java.util.*;
+
+class DFS {
+    private final LinkedList<Integer>[] adjLists;
+    private final boolean[] visited;
+
+    DFS(int vertices) {
+        adjLists = new LinkedList[vertices];
+        visited = new boolean[vertices];
+        for (int i = 0; i < vertices; i++)
+            adjLists[i] = new LinkedList<>();
+    }
+
+    void addEdge(int src, int dest) {
+        adjLists[src].add(dest);
+    }
+
+    void dfsAlgorithm(int vertex) {
+        visited[vertex] = true;
+        System.out.print(vertex + " ");
+
+        for (int adj : adjLists[vertex]) {
+            if (!visited[adj])
+                dfsAlgorithm(adj);
+        }
+    }
+
+    public static void main(String args[]) {
+        DFS g = new DFS(4);
+
+        g.addEdge(0, 1);
+        g.addEdge(0, 2);
+        g.addEdge(1, 2);
+        g.addEdge(2, 3);
+
+        System.out.println("Following is Depth First Traversal");
+
+        g.dfsAlgorithm(2);
+    }
+}