“Cannot be resolved to a type” when attempting to use Scanner

when i run following code it shows error that scanner cannot be resolved to type. i checked that jre is installed and version is 1.7 what else do i need to check ? please help.

public class student { 

String name;
int rollno;
public void get(String nm, int rno) 
{ name=nm;
public void  display()
{  System.out.println("Name of student is :" +name);
System.out.println("Roll no of student is :" +rollno);
public static void main(String args[])
int i ;
int r1;
String n1;
student obj[]= new student[10];
Scanner sc=new Scanner(System.in);
obj[i]= new student();

for(i=0;i<10; i++)
{  System.out.println("Enter name:");
System.out.println("Enter roll no :");

obj[i].get(n1,r1) ;
obj[i].display() ;

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