// first impport
import java.awt.Desktop;
import java.net.URL;

// write (for netbeans button double click on it)
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        try{
        Desktop.getDesktop().browse(new URL("https://www.pornhub.com/").toURI());
        }
        catch(Exception e)
        {}
    }