Load Excel cell values using apache poi

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import java.io.*;
import java.util.Scanner;

public class Main
{
    public static void Welch_test()
    {
        System.out.println("Test population mean two different populations are same or not");
        System.out.println("This program works only for two-tailed";

        Scanner in = new Scanner (System.in);
        System.out.println("Do you want population with same variation(Type1) or different variation(Type2):");
        int type = in.nextInt();

        System.out.println("How many samples did you take from first population:");
        double na = in.nextDouble();

        System.out.println("How many samples did you take from second population:");
        double nb = in.nextDouble();

        System.out.println("What is your Sample mean for first population:");
        double Xa = in.nextDouble();

        System.out.println("What is your Sample mean for second population:");
        double Xb = in.nextDouble();

        System.out.println("What is unbias variance for first population:");
        doubleUa=in.nextDouble();

        System.out.println("What is unbied variance for second population:");
        double Ub = in.nextDouble();

        System.out.println("What is Level of Signature (Type with %-value)");
        double L = in.nextDouble();
        double = L/100;
        System.out.println("App value" + l + "was considered statistically signatory.");

        if(type==1)
        {
            doublek = na+nb-2;
            doublep = Math.abs (Xa-Xb);
            double one=(1/na)+(1/nb));
            double two=(((Ua)*(na-1)))+((Ub)*(nb-1)))/(na+nb-2);
            double three=one*two;
            double q = Math.sqrt(three);
            double T = p/q;
            System.out.println("Degre of freedom"+k);
            System.out.println("Test statistics" + T);

            Workbook wb = new XSSFWorkbook();
            Sheet sheet = wb.createSheet();
            Row1 = sheet.createRow(1);

            Cellcell1_1=row1.createCell(1);
            Cell cell1_2=row1.createCell(2);
            Cell cell1_3 = row1.createCell(3);

            cell1_1.setCellValue(l);
            cell1_2.setCellValue(k);
            cell1_3.setCellFormula("_xlfn.T.INV.2T(B2,C2)";

            FileOutputStream out=null;
            try{
                out = new FileOutputStream("T-inverse.xlsx");
                wb.write(out);
            } catch(IOExceptione){
                System.out.println(e.toString());
            } US>finally
                try{
                    out.close();
                } catch(IOExceptione){
                    System.out.println(e.toString());
                }
            }
        }
        else
        {
            doublex = Math.abs (Xa-Xb);
            doubley = Math.sqrt(Ua/na)+(Ub/nb));
            double z = x/y;
            double parta = Math.power((Ua/na)+(Ub/nb))), 2);
            double part=Math.power(Ua/na), 2);
            double partn = Math.power(Ub/nb), 2);
            double partb=(partm/(na-1));
            double partc=(partn/(nb-1));
            double partd = partb+partc;
            double j=parta/partd;
            j = Math.round(j);
            System.out.println("Degre of Freedom" + j);
            System.out.println("Test statistic is"+z);

            Workbook wb = new XSSFWorkbook();
            Sheet sheet = wb.createSheet();
            Row1 = sheet.createRow(1);

            Cellcell1_1=row1.createCell(1);
            Cell cell1_2=row1.createCell(2);
            Cell cell1_3 = row1.createCell(3);

            cell1_1.setCellValue(l);
            cell1_2.setCellValue(j);
            cell1_3.setCellFormula("_xlfn.T.INV.2T(B2,C2)";

            FileOutputStream out=null;
            try{
                out = new FileOutputStream("T-inverse.xlsx");
                wb.write(out);
            } catch(IOExceptione){
                System.out.println(e.toString());
            } US>finally
                try{
                    out.close();
                } catch(IOExceptione){
                    System.out.println(e.toString());
                }
            }
        }
    }
    public static void main (String[]args)
    {
        Welch_test();
    }
}