title: How to select and bold the whole worksheet with Apache POI
body: <p>I am a beginner with Apache POI library.</p>
  
  <p>in VBA, I know I can select and bold the whole worksheet with following code</p>
  
  <pre><code>Dim ws As Worksheet
  Set ws = ThisWorkbook.Sheets(1)
  ws.Cells.Font.Bold = True
  </code></pre>
  
  <p>May I know how to select and bold the whole sheet by coding with Apache POI library? </p>
  
  <p>thanks</p>