Huge problem with implements

Question

Okay so about an hour ago this worked, but now it isn't can anyone tell me what I'm doing wrong? the problem is in the +,+ area.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class TestFrame extends JFrame implements ActionListener +,+ MouseListener {
     public TestFrame() {
          super("Java Scatter Graph");
          setSize(800, 800);
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          setVisible(true);
          FlowLayout flo = new FlowLayout(FlowLayout.RIGHT, 10, 10);
          setLayout(flo);
               JButton go = new JButton ("Go");
               JButton pause = new JButton ("Pause");
               JButton stop = new JButton ("Stop");
                    add(go);
                    add(stop);
                    add(pause);
                    setVisible(true);
          public static void main(String[] args) {
               TestFrame sal = new TestFrame();
}

Answer 1

about an hour ago in the command prompt it worked and it brought up the window, but now in the fourth line between the ActionListener and the MouseListener there is that little carrot thingy and no matter what I do it doesn't fix the problem. It is really frusterating because it worked about 60 minutes ago.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class TestFrame extends JFrame implements ActionListener +,+ MouseListener {
     public TestFrame() {
          super("Java Scatter Graph");
          setSize(800, 800);
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          setVisible(true);
          FlowLayout flo = new FlowLayout(FlowLayout.RIGHT, 10, 10);
          setLayout(flo);
               JButton go = new JButton ("Go");
               JButton pause = new JButton ("Pause");
               JButton stop = new JButton ("Stop");
                    add(go);
                    add(stop);
                    add(pause);
                    setVisible(true);
          public static void main(String[] args) {
               TestFrame sal = new TestFrame();
}