Help me in solving GSJ209 problem

My issue

please explain test cases in proper way

My code

// Update the '_' in the code below
import java.util.Scanner;

class Codechef
	public static void main (String[] args)
        Scanner read = new Scanner(;
        // accept the count of test cases given in the 1st line
        int t = read.nextInt();
        // Run a loop to accept 't' inputs
        for(int i=0; i<t; i++)
            // accept an integer N in each test case
            int n = read.nextInt();
            // output the number mirror for each test case
            // "println" prints output followed with a new line.

Learning course: Logic Building in Java
Problem Link: CodeChef: Practical coding for everyone

Test cases are the number of inputs u have to take in the form of while loop or for loop which will run t time and inside that loop to have to code whole rest part.