public class ComputerSystem extends JFrame{ private Vector<Computer> computers; private JButton button_Start; private JPanel panel0; private JDialog dialog_enter1; private final String[][] StaffLists = {{"p1","p1"},{"p2","p2"},{"p3","p3"},{"m1","m1"},{"m2","m2"}}; public ComputerSystem(Vector<Computer> computers){ this.computers = computers; setLayout(null); panel0 = new JPanel(); JLabel label = new JLabel(new ImageIcon("")); panel0.add(label); getContentPane().add(panel0); button_Start = new JButton("Click to login",new ImageIcon("ComputerStore.png"));//这个图片整不上去，最后整一个，好看 add(button_Start); setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); button_Start.setBounds(5,5,400,150); button_Start.setHorizontalTextPosition(SwingConstants.RIGHT); button_Start.setVerticalTextPosition(SwingConstants.CENTER); button_Start.setFont(new Font("黑体",Font.BOLD,40)); public class Main { public static void main(String[] args) { //Computer[] computers = new Computer[999]; Vector<Computer> computers = new Vector<>(999); Scanner scanner = null; int i = -1; try { scanner = new Scanner(new BufferedReader(new FileReader("C:\Users\86137\Desktop\Computer.txt"))); String item; try { while (scanner.hasNext()) { i++; item = scanner.nextLine(); String[] cols = item.split(","); if(Objects.equals(cols[0], "Desktop PC")){ computers.add(new Desktop(cols[0], cols[1], cols[2], cols[3], cols[4], Integer.valueOf(cols[7]), Integer.valueOf(cols[5]), Integer.valueOf(cols[6]))); } if(Objects.equals(cols[0], "Laptop")){ computers.add(new Laptop(cols[0], cols[1], cols[2], cols[3], cols[4], Integer.valueOf(cols[8]), Integer.valueOf(cols[5]), Integer.valueOf(cols[6]), Double.valueOf(cols[7]))); } if(Objects.equals(cols[0], "Tablet")){ computers.add(new Tablet(cols[0], cols[1], cols[2], cols[3], cols[4], Integer.valueOf(cols[6]), Double.valueOf(cols[5]))); } // computers[i].category = cols[0]; // computers[i].Type = cols[1]; // computers[i].ID = cols[2]; // computers[i].Brand = cols[3]; // computers[i].CPU_Family = cols[4]; // computers[i].Price = Integer.valueOf(cols[5]); } }finally { if (scanner != null) { scanner.close(); } } } catch (IOException e) { e.printStackTrace(); } ComputerSystem computerSystem = new ComputerSystem(computers); computerSystem.setTitle("Computer Products Management System"); computerSystem.setSize(700,300); computerSystem.setLocationRelativeTo(null); computerSystem.setVisible(true); computerSystem.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); // TableFilterDemo demo = new TableFilterDemo(computers); } }这段代码为什么无法呈现按钮和图片。 一些类没给你，不影响

这段代码中似乎缺少一些方法的结束大括号 "}"，不过我假设这只是复制时的问题。关于按钮和图片无法呈现的问题，可能是因为图片路径不正确导致的。可以尝试将图片放在项目根目录下，然后使用相对路径来加载图片，例如：

new ImageIcon("./ComputerStore.png")

另外，关于按钮无法呈现的问题，可能是因为没有将按钮添加到 JFrame 中。可以尝试添加以下代码：

getContentPane().add(button_Start);

完整代码如下：

import javax.swing.*;
import java.awt.*;
import java.io.*;
import java.util.Objects;
import java.util.Scanner;
import java.util.Vector;

public class ComputerSystem extends JFrame{
    private Vector<Computer> computers;
    private JButton button_Start;
    private JPanel panel0;
    private JDialog dialog_enter1;
    private final String[][] StaffLists = {{"p1","p1"},{"p2","p2"},{"p3","p3"},{"m1","m1"},{"m2","m2"}};

    public ComputerSystem(Vector<Computer> computers){
        this.computers = computers;
        setLayout(null);
        panel0 = new JPanel();
        JLabel label = new JLabel(new ImageIcon("./ComputerStore.png"));
        panel0.add(label);
        getContentPane().add(panel0);

        button_Start = new JButton("Click to login",new ImageIcon("./ComputerStore.png"));
        add(button_Start);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        button_Start.setBounds(5,5,400,150);
        button_Start.setHorizontalTextPosition(SwingConstants.RIGHT);
        button_Start.setVerticalTextPosition(SwingConstants.CENTER);
        button_Start.setFont(new Font("黑体",Font.BOLD,40));
    }

    public static void main(String[] args) {
        Vector<Computer> computers = new Vector<>(999);
        Scanner scanner = null;
        int i = -1;
        try {
            scanner = new Scanner(new BufferedReader(new FileReader("./Computer.txt")));
            String item;
            try {
                while (scanner.hasNext()) {
                    i++;
                    item = scanner.nextLine();
                    String[] cols = item.split(",");
                    if(Objects.equals(cols[0], "Desktop PC")){
                        computers.add(new Desktop(cols[0], cols[1], cols[2], cols[3], cols[4], Integer.valueOf(cols[7]), Integer.valueOf(cols[5]), Integer.valueOf(cols[6])));
                    }
                    if(Objects.equals(cols[0], "Laptop")){
                        computers.add(new Laptop(cols[0], cols[1], cols[2], cols[3], cols[4], Integer.valueOf(cols[8]), Integer.valueOf(cols[5]), Integer.valueOf(cols[6]), Double.valueOf(cols[7])));
                    }
                    if(Objects.equals(cols[0], "Tablet")){
                        computers.add(new Tablet(cols[0], cols[1], cols[2], cols[3], cols[4], Integer.valueOf(cols[6]), Double.valueOf(cols[5])));
                    }
                }
            }finally {
                if (scanner != null) {
                    scanner.close();
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        ComputerSystem computerSystem = new ComputerSystem(computers);
        computerSystem.setTitle("Computer Products Management System");
        computerSystem.setSize(700,300);
        computerSystem.setLocationRelativeTo(null);
        computerSystem.setVisible(true);
        computerSystem.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
}