Select a file in the file list and display the contents of a file in textarea

PrivateFileDialog OpenFileDialog =NewFileDialog ( This, "Open File", filedialog.load);Else if(EventSource = =openFile)            {openfiledialog.show (); FileName= Openfiledialog.getdirectory () +Openfiledialog.getfile (); if(FileName! =NULL) ReadFile (fileName); } Publicvoid ReadFile (String fileName) {File file=NewFile (fileName); FileReader Readin=Newfilereader (file);intSize = (int) file.length ();intCharsread = 0;Char[] content =New Char[size]; while(Readin.ready ()) Charsread+ = Readin.read (content, charsread, size-charsread); Readin.close (); Textarea.settext (NewString (content, 0, Charsread));}

Basic steps: Create an object of type FileDialog with parameter this,string,filedialog.load

In the Actionperformed method, if the event source is OpenFile, the File List dialog box is displayed, and the full file pathname is obtained using the GetPath () and GetFile () methods

Override the ReadFile function to define the file and FileReader objects, the Int type object representing the length of the files, and the array of char types

Finally close the FileReader object

Select a file in the file list and display the contents of a file in textarea