为什么在JTable中没有标题显示？

发布于 2025-01-28 08:25:35 字数 889 浏览 3 评论 0原文

我在defaultTableModel中添加了一些行，但没有显示其中一个。我的问题是 - 问题是什么？在我看来，Intellij的想法只是在对我开个玩笑。

public class Main extends JFrame {

public Main(){
    this.setLayout(null);
    JTable table = new JTable();
    table.setBounds(20,100,330,300);
    table.setBackground(Color.pink);
    DefaultTableModel dtm = (DefaultTableModel) table.getModel();
    dtm.addRow(new Object[]{"player1", "player2"});
    dtm.addRow(new Object[]{"player"});
    dtm.addRow(new Object[]{"player"});
    this.setDefaultCloseOperation(EXIT_ON_CLOSE);
    add(table);
    this.setBounds(100,100,500,500);
    this.setVisible(true);
}

public static void main(String[] args) throws IOException {
    Scanner in = new Scanner(System.in);
    EventQueue.invokeLater(Main::new);
}
}

看起来如何

原文

I added some rows to a DefaultTableModel, but none of them was shown. My question is - what is the problem? It seems to me like Intellij idea just playing a joke on me.

public class Main extends JFrame {

public Main(){
    this.setLayout(null);
    JTable table = new JTable();
    table.setBounds(20,100,330,300);
    table.setBackground(Color.pink);
    DefaultTableModel dtm = (DefaultTableModel) table.getModel();
    dtm.addRow(new Object[]{"player1", "player2"});
    dtm.addRow(new Object[]{"player"});
    dtm.addRow(new Object[]{"player"});
    this.setDefaultCloseOperation(EXIT_ON_CLOSE);
    add(table);
    this.setBounds(100,100,500,500);
    this.setVisible(true);
}

public static void main(String[] args) throws IOException {
    Scanner in = new Scanner(System.in);
    EventQueue.invokeLater(Main::new);
}
}

how it's looking

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-柠檬树下少年和吉他 2025-02-04 08:25:35

有很多原因。这是一个可运行的可演示您如何做到的。在代码中读取评论：

可运行的产生以下内容：

可运行的代码：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.io.IOException;
import java.util.Scanner;
import javax.swing.JFrame;
import static javax.swing.JFrame.EXIT_ON_CLOSE;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;


public class Main extends JFrame {

    private static final long serialVersionUID = 6666606L;

    private final Scanner in = new Scanner(System.in); // Make Scanner class global
    
    public Main() {
        // Better not to build your form in here.
        initForm();
    }

    private void initForm() {
        // Array for Column Names
        String[] columnNames = {"Player 1", "Player 2"};
        
        // Declare DefaultTableModel and apply column names and 0 rows.
        DefaultTableModel dtm = new DefaultTableModel(columnNames, 0);
        
        // Add table rows data to table model.
        dtm.addRow(new Object[]{"14 inch Buck Knife", "Rubber Boots and a Baseball Bat"});
        dtm.addRow(new Object[]{"AK47 with Grenade Launcher", "Umbrella"});
        dtm.addRow(new Object[]{"1000 Rounds of 7.62 Ammo", "Banana Flavor Juice Boxes"});
        dtm.addRow(new Object[]{"Cammo Gear & B/P Flak Jacket", "Yellow Rain Coat (with collapsible hood)"});
        dtm.addRow(new Object[]{"4 Door HumV with .50cal M2 BMG", "5 Speed Bike with cool Banana Seat"});
        dtm.addRow(new Object[]{"Satellite Phone", "Real Good Vocal Cords"});
        dtm.addRow(new Object[]{"12x Binoculars + Nite Vision", "Same (but made in WW1) c/w neck string"});
                
        JTable table = new JTable(); 
        table.setModel(dtm);   // Apply the table model to JTable
        table.setBackground(Color.pink);
        
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setTitle("JTable Demo");
        setAlwaysOnTop(true);
        
        //Upper Panel
        JPanel panelA = new JPanel();
        panelA.setPreferredSize(new Dimension(500, 100));
        JLabel label = new JLabel("<html> <font size='5'>As you can see, when the battle begins,<br>"
                                + "<center>Player 2 is in a world of hurt!</center></font></html>");
        
        // Lower Panel
        JPanel panelB = new JPanel();
        JScrollPane scrollpane = new JScrollPane(table);
        
        // JScrollPane & JTable
        scrollpane.setPreferredSize(new Dimension(500, 150));
        table.setFillsViewportHeight(true);
        
        // Add components to their respective panels
        panelA.add(label);
        panelB.add(scrollpane);
        add(panelA, BorderLayout.PAGE_START);
        add(panelB, BorderLayout.PAGE_END);
        pack();
        setLocationRelativeTo(null); // Place window in middle of screen.
        setVisible(true);
    }
    
    public static void main(String[] args) throws IOException {
        EventQueue.invokeLater(Main::new);
    }
}

There are a number of reasons. Here is a runnable that demonstrates how you can do it. Read the comments in code:

The runnable produces this:

The runnable code:

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.io.IOException;
import java.util.Scanner;
import javax.swing.JFrame;
import static javax.swing.JFrame.EXIT_ON_CLOSE;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;


public class Main extends JFrame {

    private static final long serialVersionUID = 6666606L;

    private final Scanner in = new Scanner(System.in); // Make Scanner class global
    
    public Main() {
        // Better not to build your form in here.
        initForm();
    }

    private void initForm() {
        // Array for Column Names
        String[] columnNames = {"Player 1", "Player 2"};
        
        // Declare DefaultTableModel and apply column names and 0 rows.
        DefaultTableModel dtm = new DefaultTableModel(columnNames, 0);
        
        // Add table rows data to table model.
        dtm.addRow(new Object[]{"14 inch Buck Knife", "Rubber Boots and a Baseball Bat"});
        dtm.addRow(new Object[]{"AK47 with Grenade Launcher", "Umbrella"});
        dtm.addRow(new Object[]{"1000 Rounds of 7.62 Ammo", "Banana Flavor Juice Boxes"});
        dtm.addRow(new Object[]{"Cammo Gear & B/P Flak Jacket", "Yellow Rain Coat (with collapsible hood)"});
        dtm.addRow(new Object[]{"4 Door HumV with .50cal M2 BMG", "5 Speed Bike with cool Banana Seat"});
        dtm.addRow(new Object[]{"Satellite Phone", "Real Good Vocal Cords"});
        dtm.addRow(new Object[]{"12x Binoculars + Nite Vision", "Same (but made in WW1) c/w neck string"});
                
        JTable table = new JTable(); 
        table.setModel(dtm);   // Apply the table model to JTable
        table.setBackground(Color.pink);
        
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setTitle("JTable Demo");
        setAlwaysOnTop(true);
        
        //Upper Panel
        JPanel panelA = new JPanel();
        panelA.setPreferredSize(new Dimension(500, 100));
        JLabel label = new JLabel("<html> <font size='5'>As you can see, when the battle begins,<br>"
                                + "<center>Player 2 is in a world of hurt!</center></font></html>");
        
        // Lower Panel
        JPanel panelB = new JPanel();
        JScrollPane scrollpane = new JScrollPane(table);
        
        // JScrollPane & JTable
        scrollpane.setPreferredSize(new Dimension(500, 150));
        table.setFillsViewportHeight(true);
        
        // Add components to their respective panels
        panelA.add(label);
        panelB.add(scrollpane);
        add(panelA, BorderLayout.PAGE_START);
        add(panelB, BorderLayout.PAGE_END);
        pack();
        setLocationRelativeTo(null); // Place window in middle of screen.
        setVisible(true);
    }
    
    public static void main(String[] args) throws IOException {
        EventQueue.invokeLater(Main::new);
    }
}

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