How to resize existing PDF size to A3 size

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Java

Java code to resize existing PDF size to A3 Size

What I have tried:

import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
import com.spire.pdf.PdfPageSize;
import com.spire.pdf.graphics.*;
import java.awt.geom.Point2D;
public class ResetToStandardPageSize {
public static void main(String []args){
//Create a new PDF document
PdfDocument newPdf = new PdfDocument();
//Set page size as A1
newPdf.getPageSettings().setSize(PdfPageSize.A1);
//Remove page margins
newPdf.getPageSettings().setMargins(new PdfMargins(0));
//Load the sample PDF document
PdfDocument pdf = new PdfDocument("Sample.pdf");
//Iterate through the pages in the sample PDF
for(int i = 0; i< pdf.getPages().getCount(); i++)
{
//Add pages to the new PDF
PdfPageBase newPage = newPdf.getPages().add();
//Set text layout as 1 page, if not set the content will not scale to fit page size
PdfTextLayout layout = new PdfTextLayout();
layout.setLayout(PdfLayoutType.One_Page);
//Create templates for the pages in sample PDF and draw templates to the pages of the new PDF
pdf.getPages().get(i).createTemplate().draw(newPage, new Point2D.Float(0,0), layout);
}
//Save the result document
newPdf.saveToFile("ChangePageSizeToA1.pdf");
}
}