void type not allowed here

[Nazneen Ali]

private void jButtonReadActionPerformed(java.awt.event.ActionEvent evt) {
DNA d1=new DNA();
       d1.readFromFile(jTextFieldFilePath.getText());
       d1.readFromFile(jTextFieldSequenceName.setText(d1.getName());//error
       d1.readFromFile(jTextAreaInput.setText(d1.getSeq()));//error

While getText(), getSeq(), readFromFile() all DO have the return type String.

The code for these methods is as follows:

String readFromFile(String path){
       String stringFromFile= new String();

        try
       {
           FileReader fro = new FileReader( path );
           BufferedReader bro = new BufferedReader( fro );
          String strline= bro.readLine( );

          stringFromFile= "";
          while( strline!= null )
          {  stringFromFile+= strline;
          strline= bro.readLine( );
          }
          
          bro.close( );}
       catch( FileNotFoundException filenotfoundexxption)
       {
           System.out.println( "FastaDNA.txt, does not exist" );
       }
       catch( IOException ioexception)
       {
           ioexception.printStackTrace( );
       }


       System.out.println("To test if the file, FastaDNA.text located in G drive, has been read:\nSEQUENCE NAME:" + stringFromFile.substring(0, stringFromFile.indexOf(">")));
       System.out.println("SEQUENCE:"+ stringFromFile.substring(stringFromFile.indexOf(">")+1,stringFromFile.length()));

return stringFromFile;
    }

 String getName(){
    return JOptionPane.showInputDialog(this,"Name of the sequence:");
   }

String getSeq(){
    return JOptionPane.showInputDialog(this,"Sequence:");

    }

[sunde887]

setText returns void, the method most likely takes some argument. readFromFile(...) expects a string, but what you are passing in is a call to setText(...)