hvordan laver man parrallel threads

hvordan kan jeg lave de to klasser nedunder så at de kører i to parrallel threads?

class 1

public class ttteer{
    private SimpleRead;
   
public ttteer(){
    Read = new SimpleRead(this);
}

public void setData(String s){
    //the code here set the text in GUI
}

public static void main(String[] args) throws IOException{
       
    SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                try{
                    ttteer application = new ttteer();
                    application.getJFrame().setVisible(true);
                }catch(IOException w){
                }
            }
        });
    }
}


class 2

public class SimpleRead {

public SimpleRead(){
    //the code here opens the serial port
}

public void serialEvent(SerialPortEvent event){
    //here i read the data from the serial port whenever there is a serial port event
}

public void writeToport(){
    //here I write to the port
}

}