如何解决JLabel上的setText？

Question

目前，我特别关注：

v1.setText(value1);

v2.setText(value2);

v3.setText(value3);

v4.setText(value4);

v5.setText(value5);

v1 cannot be resolved

v2 cannot be resolved

v3 cannot be resolved

v4 cannot be resolved

v5 cannot be resolved

package Hummus;

import java.awt.Color;
import java.awt.Cursor;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.List;
import java.util.ArrayList;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import javax.swing.border.LineBorder;
import javax.swing.JTextArea;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;

public class Dashboard extends JFrame {

    /**
     * @author Mohamed Gharib
     * @category E-Commerce
     */
    
    private static final long serialVersionUID = 1L;
    private JPanel contentPane;
    
    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Dashboard frame = new Dashboard();
                    frame.setLocationRelativeTo(null);
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public Dashboard() {
        setUndecorated(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 700, 500);
        contentPane = new JPanel();
        contentPane.setBackground(Color.BLACK);
        contentPane.setBorder(null);

        setContentPane(contentPane);
        contentPane.setLayout(null);
        
        JPanel navigation = new JPanel();
        navigation.setBackground(new Color(40, 40, 40));
        navigation.setBounds(0, 0, 700, 24);
        contentPane.add(navigation);
        navigation.setLayout(null);
        
        JButton exit = new JButton("X");
        exit.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        });
        exit.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseEntered(MouseEvent e) {
                exit.setBackground(Color.DARK_GRAY);
            }
            @Override
            public void mouseExited(MouseEvent e) {
                exit.setBackground(new Color(40, 40, 40));
            }
        });
        exit.setForeground(Color.GRAY);
        exit.setBackground(new Color(40, 40, 40));
        exit.setFont(new Font("SansSerif", Font.BOLD, 11));
        exit.setFocusPainted(false);
        exit.setContentAreaFilled(false);
        exit.setOpaque(true);
        exit.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
        exit.setBorder(null);
        exit.setBounds(650, 0, 50, 24);
        navigation.add(exit);
        
        JButton maximize = new JButton("⬜");
        maximize.setEnabled(false);
        maximize.setFont(new Font("Tahoma", Font.PLAIN, 10));
        maximize.setForeground(Color.GRAY);
        maximize.setBackground(new Color(40, 40, 40));
        maximize.setFocusPainted(false);
        maximize.setContentAreaFilled(false);
        maximize.setOpaque(true);
        maximize.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
        maximize.setBorder(null);
        maximize.setBounds(600, 1, 50, 24);
        navigation.add(maximize);
        
        JButton minimize = new JButton("–");
        minimize.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                setExtendedState(Frame.ICONIFIED);
            }
        });
        minimize.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseEntered(MouseEvent e) {
                minimize.setBackground(Color.DARK_GRAY);
            }
            @Override
            public void mouseExited(MouseEvent e) {
                minimize.setBackground(new Color(40, 40, 40));
            }
        });
        minimize.setForeground(Color.GRAY);
        minimize.setBackground(new Color(40, 40, 40));
        minimize.setFont(new Font("Tahoma", Font.BOLD, 11));
        minimize.setFocusPainted(false);
        minimize.setContentAreaFilled(false);
        minimize.setOpaque(true);
        minimize.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
        minimize.setBorder(null);
        minimize.setBounds(550, 1, 50, 24);
        navigation.add(minimize);
        
        JPanel container = new JPanel();
        container.setBackground(Color.BLACK);
        container.setBorder(null);
        container.setBounds(44, 69, 613, 386);
        contentPane.add(container);
        container.setLayout(null);
        
        JTextArea textarea = new JTextArea();
        textarea.setBackground(Color.WHITE);
        textarea.setFont(new Font("SansSerif", Font.PLAIN, 12));
        textarea.setBounds(0, 0, 250, 284);
        textarea.setBorder(null);
                
        JScrollPane scrollPane = new JScrollPane(textarea);
        scrollPane.setBounds(0, 0, 250, 284);
        container.add(scrollPane);
                        
        JScrollBar scrollBar = new JScrollBar(JScrollBar.VERTICAL);
        scrollBar.setBounds(277, 69, 17, 284);
        scrollPane.setVerticalScrollBar(scrollBar);
        
        JButton reset = new JButton("R E S E T");
        reset.setBounds(0, 346, 250, 40);
        container.add(reset);
        reset.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                String textArea = textarea.getText();
                if(textArea.isBlank() || textArea.isEmpty()) {
                    assert false;
                } else {
                    textarea.setText("");
                }
                
            }
        });
        reset.setBorder(new LineBorder(Color.WHITE, 1, true));
        reset.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
        reset.setFocusPainted(false);
        reset.setContentAreaFilled(false);
        reset.setOpaque(true);
        reset.setBackground(Color.BLACK);
        reset.setForeground(Color.WHITE);
        reset.setFont(new Font("SansSerif", Font.BOLD, 11));
        
        JButton stop = new JButton("S T O P");
        stop.setBounds(130, 295, 120, 40);
        container.add(stop);
        stop.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
            }
        });
        stop.setBackground(Color.BLACK);
        stop.setForeground(Color.WHITE);
        stop.setFont(new Font("SansSerif", Font.BOLD, 11));
        stop.setFocusPainted(false);
        stop.setContentAreaFilled(false);
        stop.setOpaque(true);
        stop.setBorder(new LineBorder(Color.WHITE, 1, true));
        stop.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
        
        JButton start = new JButton("S T A R T");
        start.setBounds(0, 295, 120, 40);
        container.add(start);
        start.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                String text = textarea.getText();

                String[] lines = text.split("\\r?\\n");

                for (int i = 0; i < lines.length; i += 5) {
                    List<String> list = new ArrayList<>();
                    
                    for (int j = i; j < Math.min(i + 5, lines.length); j++) {
                        list.add(lines[j]);
                    }

                    String value1 = (list.size() > 0) ? list.get(0) : "";
                    String value2 = (list.size() > 1) ? list.get(1) : "";
                    String value3 = (list.size() > 2) ? list.get(2) : "";
                    String value4 = (list.size() > 3) ? list.get(3) : "";
                    String value5 = (list.size() > 4) ? list.get(4) : "";

                    v1.setText(value1);
                    v2.setText(value2);
                    v3.setText(value3);
                    v4.setText(value4);
                    v5.setText(value5);
                    
                }
                
                
            }
        });
        start.setBackground(Color.BLACK);
        start.setForeground(Color.WHITE);
        start.setFont(new Font("SansSerif", Font.BOLD, 11));
        start.setBorder(new LineBorder(Color.WHITE, 1, true));
        start.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
        start.setFocusPainted(false);
        start.setContentAreaFilled(false);
        start.setOpaque(true);
        
        JPanel table = new JPanel();
        table.setBounds(263, 0, 350, 386);
        container.add(table);
        table.setBorder(new LineBorder(Color.GRAY, 2, true));
        table.setBackground(Color.BLACK);
        table.setLayout(null);
        
        JPanel x = new JPanel();
        x.setBackground(Color.GRAY);
        x.setBounds(175, 0, 2, 386);
        table.add(x);
        
        JPanel xxx = new JPanel();
        xxx.setBackground(Color.GRAY);
        xxx.setBounds(0, 64, 350, 2);
        table.add(xxx);
        
        JPanel xxxx = new JPanel();
        xxxx.setBackground(Color.GRAY);
        xxxx.setBounds(0, 128, 350, 2);
        table.add(xxxx);
        
        JPanel xxxxx = new JPanel();
        xxxxx.setBackground(Color.GRAY);
        xxxxx.setBounds(0, 192, 350, 2);
        table.add(xxxxx);
        
        JPanel xxxxxx = new JPanel();
        xxxxxx.setBackground(Color.GRAY);
        xxxxxx.setBounds(0, 256, 350, 2);
        table.add(xxxxxx);
        
        JPanel xxxxxxx = new JPanel();
        xxxxxxx.setBackground(Color.GRAY);
        xxxxxxx.setBounds(0, 320, 350, 2);
        table.add(xxxxxxx);
        
        JLabel link = new JLabel("L I N K");
        link.setFont(new Font("SansSerif", Font.BOLD, 11));
        link.setForeground(Color.LIGHT_GRAY);
        link.setHorizontalAlignment(SwingConstants.CENTER);
        link.setBounds(0, 0, 175, 64);
        table.add(link);
        
        JLabel v1 = new JLabel("");
        v1.setLabelFor(link);
        v1.setFont(new Font("SansSerif", Font.BOLD, 12));
        v1.setForeground(Color.LIGHT_GRAY);
        v1.setHorizontalAlignment(SwingConstants.CENTER);
        v1.setBounds(0, 64, 175, 64);
        table.add(v1);
        
        JLabel v2 = new JLabel("");
        v2.setLabelFor(link);
        v2.setFont(new Font("SansSerif", Font.BOLD, 11));
        v2.setForeground(Color.LIGHT_GRAY);
        v2.setHorizontalAlignment(SwingConstants.CENTER);
        v2.setBounds(0, 128, 175, 64);
        table.add(v2);
        
        JLabel v3 = new JLabel("");
        v3.setLabelFor(link);
        v3.setForeground(Color.LIGHT_GRAY);
        v3.setFont(new Font("SansSerif", Font.BOLD, 11));
        v3.setHorizontalAlignment(SwingConstants.CENTER);
        v3.setBounds(0, 192, 175, 64);
        table.add(v3);
        
        JLabel v4 = new JLabel("");
        v4.setLabelFor(link);
        v4.setFont(new Font("SansSerif", Font.BOLD, 11));
        v4.setForeground(Color.LIGHT_GRAY);
        v4.setHorizontalAlignment(SwingConstants.CENTER);
        v4.setBounds(0, 256, 175, 64);
        table.add(v4);
        
        JLabel v5 = new JLabel("");
        v5.setLabelFor(link);
        v5.setFont(new Font("SansSerif", Font.BOLD, 11));
        v5.setForeground(Color.LIGHT_GRAY);
        v5.setHorizontalAlignment(SwingConstants.CENTER);
        v5.setBounds(0, 320, 175, 64);
        table.add(v5);
        
        JLabel status = new JLabel("S T A T U S");
        status.setHorizontalAlignment(SwingConstants.CENTER);
        status.setForeground(Color.LIGHT_GRAY);
        status.setFont(new Font("SansSerif", Font.BOLD, 11));
        status.setBounds(175, 0, 175, 64);
        table.add(status);
        
        JLabel x1 = new JLabel("");
        x1.setLabelFor(status);
        x1.setFont(new Font("SansSerif", Font.BOLD, 11));
        x1.setForeground(Color.LIGHT_GRAY);
        x1.setHorizontalAlignment(SwingConstants.CENTER);
        x1.setBounds(175, 64, 175, 64);
        table.add(x1);
        
        JLabel x2 = new JLabel("");
        x2.setLabelFor(status);
        x2.setFont(new Font("SansSerif", Font.BOLD, 11));
        x2.setForeground(Color.LIGHT_GRAY);
        x2.setHorizontalAlignment(SwingConstants.RIGHT);
        x2.setBounds(175, 128, 175, 64);
        table.add(x2);
        
        JLabel x3 = new JLabel("");
        x3.setLabelFor(status);
        x3.setFont(new Font("SansSerif", Font.BOLD, 11));
        x3.setForeground(Color.LIGHT_GRAY);
        x3.setHorizontalAlignment(SwingConstants.CENTER);
        x3.setBounds(175, 192, 175, 64);
        table.add(x3);
        
        JLabel x4 = new JLabel("");
        x4.setLabelFor(status);
        x4.setFont(new Font("SansSerif", Font.BOLD, 11));
        x4.setForeground(Color.LIGHT_GRAY);
        x4.setHorizontalAlignment(SwingConstants.CENTER);
        x4.setBounds(175, 256, 175, 64);
        table.add(x4);
        
        JLabel x5 = new JLabel("");
        x5.setLabelFor(status);
        x5.setFont(new Font("SansSerif", Font.BOLD, 11));
        x5.setForeground(Color.LIGHT_GRAY);
        x5.setHorizontalAlignment(SwingConstants.CENTER);
        x5.setBounds(175, 320, 175, 64);
        table.add(x5);
        
        
    }
}