java - JTable 标题仍未显示

Question

我看过并发现很多人没有将他们的表格放入 scrollPane 中。即使我将表格嵌套到 scrollPane 中，然后嵌套到框架中，它仍然无法显示标题。还有什么我想念的吗？谢谢

public class Gui extends JFrame {

AbstractTableModel model;
JTable table; 



public void start(AbstractTableModel model) { 
    this.model = model;
    table=new JTable(model){
        @Override 
        public boolean isCellEditable(int arg0, int arg1) { 
            return false; 
        }

    }; 


    table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    TableColumn column = null;
        for (int i = 0; i < model.getColumnCount(); i++) {
            column = table.getColumnModel().getColumn(i);
            column.setPreferredWidth(120);
            column.setMaxWidth(300);
            column.setMinWidth(50);
        }    

        JScrollPane pane = new JScrollPane(table);  
        pane.setPreferredSize(new Dimension(900,900));

        add(pane); 
        setLayout(new FlowLayout()); 
        setVisible(true); 
        setDefaultCloseOperation(EXIT_ON_CLOSE); 
        pack();
}

Answer 1

根据您的代码，然后必须添加缺少的功能，您的代码可以工作...

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import javax.swing.JFrame;
import static javax.swing.JFrame.EXIT_ON_CLOSE;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;

public class Gui extends JFrame {

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                Gui frame = new Gui();
                frame.start(new DefaultTableModel(new Object[]{"A", "B", "C"}, 10));
            }
        });
    }

    AbstractTableModel model;
    JTable table;

    public void start(AbstractTableModel model) {
        this.model = model;
        table = new JTable(model) {
            @Override
            public boolean isCellEditable(int arg0, int arg1) {
                return false;
            }

        };

        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        TableColumn column = null;
        for (int i = 0; i < model.getColumnCount(); i++) {
            column = table.getColumnModel().getColumn(i);
            column.setPreferredWidth(120);
            column.setMaxWidth(300);
            column.setMinWidth(50);
        }

        JScrollPane pane = new JScrollPane(table);
        pane.setPreferredSize(new Dimension(900, 900));

        add(pane);
        setLayout(new FlowLayout());
        setVisible(true);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        pack();

    }
}

然后这导致了两个广泛的假设......

1. 您的 TableModel 没有任何列
2. 您的 TableModel 没有任何列名...

例如，一个没有列名的 TableModel...

个人...

• 我不会为此使用 FlowLayout，BorderLayout 会给出更好的结果
• 在使其可见之前打包框架
• 在添加组件之前设置布局，因为有时候，事情会变得一团糟...

例如……

setLayout(new FlowLayout()); // But I'd use a `BorderLayout`
add(pane);
setDefaultCloseOperation(EXIT_ON_CLOSE);
pack();
setVisible(true);