Added a java program to reverse a linked list

Program's_Contributed_By_Contributors/Java_Programs/Data_structure/Reverse_Linked_List.java

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+// Java program for reversing the linked list
+
+class Reverse_Linked_List {
+
+    static Node head;
+
+    static class Node {
+
+        int data;
+        Node next;
+
+        Node(int d) {
+            data = d;
+            next = null;
+        }
+    }
+
+    /* Function to reverse the linked list */
+    Node reverse(Node node) {
+        Node prev = null;
+        Node current = node;
+        Node next = null;
+        while (current != null) {
+            next = current.next;
+            current.next = prev;
+            prev = current;
+            current = next;
+        }
+        node = prev;
+        return node;
+    }
+
+    // prints content of double linked list
+    void printList(Node node) {
+        while (node != null) {
+            System.out.print(node.data + " ");
+            node = node.next;
+        }
+    }
+
+    // Driver Code
+    public static void main(String[] args) {
+        Reverse_Linked_List list = new Reverse_Linked_List());
+        list.head = new Node(85);
+        list.head.next = new Node(15);
+        list.head.next.next = new Node(4);
+        list.head.next.next.next = new Node(20);
+
+        System.out.println("Given Linked list");
+        list.printList(head);
+        head = list.reverse(head);
+        System.out.println("");
+        System.out.println("Reversed linked list ");
+        list.printList(head);
+    }
+}
+
+// This code has been contributed by Mayank Jaiswal