Create DepthFirstSearch.java

Algorithms/DepthFirstSearch.java

@@ -0,0 +1,53 @@
+package Algorithms;
+
+import java.util.Iterator;
+import java.util.LinkedList;
+
+public class DepthFirstSearch {
+    public static void main(String args[])
+    {
+        Graph g = new Graph(4);
+
+        g.addEdge(0, 1);
+        g.addEdge(0, 2);
+        g.addEdge(1, 2);
+        g.addEdge(2, 0);
+        g.addEdge(2, 3);
+        g.addEdge(3, 3);
+
+        g.DFS(2);
+    }
+}
+
+
+class Graph {
+    private int numVertices;
+    private LinkedList<Integer> adjLists[];
+    private boolean visited[];
+
+    public Graph(int vertices) {
+        numVertices = vertices;
+        adjLists = new LinkedList[vertices];
+        visited = new boolean[vertices];
+
+        for (int i = 0; i < vertices; i++)
+            adjLists[i] = new LinkedList<Integer>();
+    }
+
+    void addEdge(int src, int dest) {
+        adjLists[src].add(dest);
+    }
+
+    void DFS(int vertex) {
+        visited[vertex] = true;
+        System.out.print(vertex + " ");
+
+        Iterator ite = adjLists[vertex].listIterator();
+        while (ite.hasNext())
+        {
+            int adj = (int) ite.next();
+            if (!visited[adj])
+                DFS(adj);
+        }
+    }
+}