question: protected X509Certificate [ ] openCertificate ( File certificateFile ) { try { FileInputStream is = new FileInputStream ( certificateFile ) ; return openCertificate ( is , certificateFile . getName ( ) ) ; } catch ( FileNotFoundException ex ) { JOptionPane . showMessageDialog ( frame , MessageFormat . format ( res . getString ( "KeyStoreExplorerAction.NoReadFile.message" ) , certificateFile ) , res . getString ( "KeyStoreExplorerAction.OpenCertificate.Title" ) , JOptionPane . WARNING_MESSAGE ) ; return null ; } }
target:  Open a certificate file.