Apache POI Tutorial - How to read/write data from Excel file (Code)

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package day1;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class Writing {

	public static void main(String[] args) throws Exception{
		// TODO Auto-generated method stub
		// 1.Read Workbook    > .xls : HSSF				.xlsx : XSSF 
		XSSFWorkbook wb=new XSSFWorkbook(new FileInputStream("C:\\Users\\mprem\\OneDrive\\Desktop\\data.xlsx"));
		//2.Read SHeet
		XSSFSheet sh=wb.getSheet("Sheet1");
		
		String data=sh.getRow(2).getCell(1).toString();
		System.out.println(data);
		// 1.Reading data from cell if row & column both are there
		sh.getRow(2).getCell(1).setCellValue("prem");
		//2.Reading data from cell if row is there & column is not  there
		sh.getRow(2).createCell(2).setCellValue("prem");
		//3.Reading data from cell if row  & column both are not  there
		sh.createRow(4).createCell(2).setCellValue("prem");

		wb.write(new FileOutputStream("C:\\Users\\mprem\\OneDrive\\Desktop\\data.xlsx"));
	}
}