IMPLEMENT HASH TABLE

how to implement hash table

Competitive Coding/IMPLEMENTING HASH TABLE/Hashtable.java

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+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+
+import java.util.Scanner;
+class Student{
+    int key;
+    String date;
+    String name;
+    Student next;
+}
+class Hashtable{
+    Scanner s=new Scanner(System.in);
+
+    Student node=new Student();
+    static Hashtable n=new Hashtable();
+    Student arr[]=new Student[10];
+    void Hash(){
+
+        System.out.print("enter input elements");
+        for(int x=0;x<5;x++) {
+            Student node=new Student();
+            node.key = s.nextInt();
+            node.date=s.next();
+            node.name=s.next();
+
+        int v= n.calculate(node.key);
+
+if (arr[v]==null)
+{
+node.next=null;
+arr[v]=node;
+}
+else
+{
+            Student ptr;
+            ptr=arr[v];
+            while(ptr.next!=null){
+                ptr=ptr.next;
+            }
+            ptr.next=node;
+            node.next=null;
+} 
+       }
+    }
+    int calculate(int value)
+    {
+        int index =value%10;
+        return index;
+    }
+    void display()
+    {
+        for(int i=0;i<10;i++){
+    if(arr[i]==null)
+{
+System.out.println(arr[i]);
+}
+else
+{
+Student ptr=arr[i];
+while(ptr!=null)
+{
+System.out.print("->"+ptr.key);
+
+ptr=ptr.next;
+}
+System.out.println();
+}
+    }}
+    public static void main(String args[])
+    {
+
+       n.Hash();
+        n.display();
+    }
+}