java JTable显示为空白
我将只发布重要的部分
我创建了一个JFrame,其中包含一个JPanel,其中包含一些JTextFields、JTextAreas和一个JList。我知道我想添加一个JTable来显示一些结果,但它将显示为空白。我试着查看一些帖子,但没能修复
我手动输入了两行,但它们不会出现。列名也不会。请帮忙
import javax.swing.*;
import javax.swing.table.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
public class GUI_Automata_Ex_1 extends JFrame {
public static int ScreenWidth = Toolkit.getDefaultToolkit().getScreenSize().width;
public static int ScreenHeight = Toolkit.getDefaultToolkit().getScreenSize().height;
public static int WindowWidth = ScreenWidth*3/4;
public static int WindowHeight = WindowWidth*9/16;
public static int unit = WindowWidth/160;
// tables used
static String[] columnNames = {"word", "length", "result"};
static Object[][] data = {{"abbaa", new Integer (5), "belongs"}, {"baabbb", new Integer (6), "does not belong"}};
public static JTable table_saved_words = new JTable(data, columnNames);
public static DefaultTableModel dtm_saved_words = new DefaultTableModel();
public static JScrollPane sp_saved_words;
public GUI_Automata_Ex_1 () {
// this will only run on ultrawide screens (e.g. 21:9 or 32:9) because the window is 16:9 optimized
if (ScreenWidth/2 > ScreenHeight) {
WindowHeight = ScreenHeight*3/4;
WindowWidth = WindowHeight*16/9;
unit = WindowWidth/160;
}
this.setTitle("Automata Theory 1st Excercise");
this.setBounds(ScreenWidth/2-WindowWidth/2,ScreenHeight/2-WindowHeight/2,WindowWidth,WindowHeight);
this.setResizable(false);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setBackground(colorBG);
Board board = new Board();
this.setContentPane(board);
this.setLayout(null);
// TABLES
// settings for table_saved_words
table_saved_words.setBackground(Color.white);
table_saved_words.setFont(fontM);
table_saved_words.setModel(dtm_saved_words);
table_saved_words.setPreferredScrollableViewportSize(new Dimension(unit*86, unit*50));
table_saved_words.setFillsViewportHeight(true);
sp_saved_words = new JScrollPane(table_saved_words);
board.add(sp_saved_words);
sp_saved_words.setBounds(unit*68, unit*32, unit*86, unit*50);
sp_saved_words.setWheelScrollingEnabled(true);
sp_saved_words.setViewportView(table_saved_words);
sp_saved_words.setVisible(false);
dtm_saved_words.addRow(new Object[]{"aabbbbaa", 5, "belongs"});
}
public class Board extends JPanel {
public void paintComponent (Graphics g) {
}
}
}
}
以下是一个屏幕截图:
https://i.stack.imgur.com/AHtLf.png
JTable位于右下角。我没有包括其他J组件的代码部分
在获得要显示的列表后,我想做的只是在窗口运行时添加一些行(用户输入的单词,或者属于字典,或者不属于字典,以及它们的长度),但我一直坚持的部分是让JTable显示列和数据
# 1 楼答案
您的表模型没有列,因此它从不显示添加到其中的数据
从documentation for the zero-argument DefaultTableModel constructor
最初,您的表具有自动创建的有效表模型:
然后创建一个没有列的新模型: