Chỉnh sửa và cập nhật chữ ký Text được đặt trong tệp Pptx

        
// Set up input Pptx file
String filePath = "input.pptx";
// Set up output file
String outputFilePath = "output.pptx";

// Instantiate Signature for input file
Signature signature = new Signature(filePath);

// Id of signature which is supposed to be updated
// such Id might be got as a result of search operation
String id = "eff64a14-dad9-47b0-88e5-2ee4e3604e71";

// provide signature features to update
// set up particular signature id
TextSignature signatureToUpdate = new TextSignature(id);

// specify signature width
signatureToUpdate.setWidth(130);
// specify signature height
signatureToUpdate.setHeight(20);
// set left position
signatureToUpdate.setLeft(40);
// set top position
signatureToUpdate.setTop(50);
// set up new text
signatureToUpdate.setText("Mr. John Smith");

// update signature
Boolean updateResult = signature.update(outputFilePath, signatureToUpdate);

// process updation result
if (updateResult)
{
        System.out.println("Signature was updated successfully!");
}