kaansonmezoz

public class FileOperations {
  
  // some code here
  
  public String readFile(String filePath){
    if(isPdfFile(filePath)){
      return readPdfFile(filepath);
    }
    else if(isExcelFile(filePath)) {
      return readExcelFile(filePath);

kaansonmezoz

public class FileOperations {
  
  // some code here
  
  public String readPdfFile(String filePath) {
    // some code here
    return fileContent
  }
}