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TopologicalSorting.java

@@ -0,0 +1,53 @@
+import java.util.*;
+class Graph{
+	int v;
+	LinkedList<Integer> adj[];
+	@SuppressWarnings("unchecked")
+	Graph(int v){
+		this.v=v;
+		adj=new LinkedList[v];
+		for(int i=0;i<v;i++)
+			adj[i]=new LinkedList<>();
+	}
+}
+class TopologicalSorting{
+	public static void addEdge(Graph g,int u,int v){
+		g.adj[u].add(v);
+	}
+	public static void toposortutil(Graph g,int node,boolean visit[],Stack st)
+	{
+		visit[node]=true;
+		int i;
+		Iterator<Integer>it=g.adj[node].iterator();
+		while(it.hasNext())
+		{
+			i=it.next();
+			System.out.println(i);
+			if(!visit[i])
+				toposortutil(g,i,visit,st);
+		}
+		System.out.println("node"+node);
+		st.push(node);
+	}
+	public static void toposort(Graph g){
+		Stack st=new Stack();
+		boolean visit[]=new boolean[g.v];
+		for(int i=0;i<g.v;i++)
+			if(visit[i]==false)
+				toposortutil(g,i,visit,st);
+		while(st.empty()==false)
+			System.out.println(st.pop()+" ");
+	}
+	public static void main(String[] args){
+		 Graph g = new Graph(6); 
+		TopologicalSorting tp=new TopologicalSorting();
+		tp.addEdge(g,5, 2); 
+        tp.addEdge(g,5, 0); 
+        tp.addEdge(g,4, 0); 
+        tp.addEdge(g,4, 1); 
+        tp.addEdge(g,2, 3); 
+        tp.addEdge(g,3, 1);
+		tp.toposort(g);
+	}
+}
+