swastik, Java - rextester

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//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.Scanner;

class Rextester
{  
    public static void main(String args[])
    {
        Scanner in=new Scanner(System.in);
        int n=in.nextInt();
        for(int i=1;i<=n;i++)
              System.out.print("*");
         for(int j=1;j<=n-1;j++)
              System.out.print(" ");
               System.out.println("*");
           for(int k=1;k<=n;k++){
                  for(int l=1;l<=n-2;l++)
                          System.out.print(" ");
                         System.out.print(" *");
                   for(int m=1;m<=n-2;m++)
                         System.out.print(" ");
                          System.out.print(" *");
                          System.out.print("\n");
                      }
                   for(int p=1;p<=(2*n);p++)
                        System.out.print("*");
                        System.out.println("");
                   for(int o=1;o<=n;o++){
                         System.out.print("*");
                   for(int r=1;r<=n-2;r++)
                          System.out.print(" ");
                          System.out.print("*");
                           System.out.println("");
                  }        
                           System.out.print("*");
              for(int s=1;s<=n-2;s++)
                           System.out.print(" ");
              for(int t=1;t<=n;t++)
                         System.out.print("*");
    }
}

[ - ] Show input
Compilation time: 1.14 sec, absolute running time: 0.28 sec, cpu time: 0.29 sec, memory peak: 20 Mb, absolute service time: 1,42 sec