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jTable.setModel() 不能按预期工作

[英]jTable.setModel() doesn't work as expected

 原文  2020-03-31 16:02:47  0   1    java/ swing/ jtable/ tablemodel

问题描述

我创建了一个内部框架，主要包含一个 jlist 和一个 jtable。

我要做的是当用户在 jList 中选择一个政党或一组政党时，表格应该包括一个带有所选政党名称的列并将其添加到 jTable。 默认 jTable

我实现的将初始tableModel存储在一个对象中，每次用户在jList选择中进行更改时，它都会先将表模型更改为存储的对象，然后根据新的选择进行更改。 第一次选择后的表

问题是定义的 jTable1.setModel() 方法不起作用。 第二次选择后的错误表

PS：未使用的代码已删除。 问题仅包含导致错误的代码段。 完整文件可以在： 这里看到

import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;

public class DispatchPlanningSelfContained extends javax.swing.JFrame {

    DefaultTableModel defaultdtm;
    public DispatchPlanningSelfContained() {
        initComponents();
        defaultdtm = (DefaultTableModel) jTable1.getModel();
        jList1.addListSelectionListener(new ListSelectionListener() {
            @Override
            public void valueChanged(ListSelectionEvent e) {
                if(!e.getValueIsAdjusting()){
                    //I use either of below method each time
                    jTable1.setModel((TableModel)defaultdtm);// This Doesn't set the tablemodel to default one (I expect this to set the table as Image 1)
                    jTable1.setModel(defaultdtm);// This too Doesn't set the tablemodel to default one

                    DefaultTableModel dtm = (DefaultTableModel) jTable1.getModel();

                    int selection[] = jList1.getSelectedIndices();
                    System.out.println("Selection Length = " + selection.length);
                    for(int i = 0; i < selection.length; i++){
                        dtm.addColumn(jList1.getModel().getElementAt(selection[i]));
                            System.out.println("selection [" + i + "] = " + jList1.getModel().getElementAt(selection[i]));
                    }
                }
            }
        });
    }
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        jLabel4 = new javax.swing.JLabel();
        jScrollPane3 = new javax.swing.JScrollPane();
        jList1 = new javax.swing.JList<>();
        jLabel5 = new javax.swing.JLabel();
        jScrollPane2 = new javax.swing.JScrollPane();
        jTable1 = new javax.swing.JTable();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jLabel4.setText("Pending Party Names");

        jList1.setModel(new javax.swing.AbstractListModel<String>() {
            String[] strings = { "Party 1", "Party 2", "Party 3", "Party 4", "Party 5", "Party 6", "Party 7", "Party 8", "Party 9" };
            public int getSize() { return strings.length; }
            public String getElementAt(int i) { return strings[i]; }
        });
        jScrollPane3.setViewportView(jList1);

        jLabel5.setText("Planning Results:");

        jTable1.setAutoCreateRowSorter(true);
        jTable1.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {

            },
            new String [] {
                "Code", "Description", "Rulling", "Page", "MRP", "QPC", "Total Order", "Stock", "Shortage"
            }
        ));
        jScrollPane2.setViewportView(jTable1);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 967, Short.MAX_VALUE)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addContainerGap()
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(jScrollPane2)
                        .addGroup(layout.createSequentialGroup()
                            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addGroup(layout.createSequentialGroup()
                                    .addGap(268, 268, 268)
                                    .addComponent(jLabel4))
                                .addComponent(jLabel5))
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                            .addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, 531, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 52, Short.MAX_VALUE)))
                    .addContainerGap()))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 585, Short.MAX_VALUE)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addContainerGap()
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(layout.createSequentialGroup()
                            .addComponent(jLabel4)
                            .addGap(96, 96, 96)
                            .addComponent(jLabel5))
                        .addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addContainerGap()))
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new DispatchPlanningSelfContained().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JList<String> jList1;
    private javax.swing.JScrollPane jScrollPane2;
    private javax.swing.JScrollPane jScrollPane3;
    private javax.swing.JTable jTable1;
    // End of variables declaration//GEN-END:variables
}

1 个解决方案

解决方案1
 1  2020-04-01 17:24:42

问题从这里开始，其背后的假设是：

DefaultTableModel dtm = (DefaultTableModel) jTable1.getModel();

代码似乎将dtm视为初始表模型的副本，而现在它只是引用它。

最简单的解决方法是在每次更改时使用原始数据初始化表模型：

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;

public class DispatchPlanningSelfContained extends JFrame {

    Object[][] data = new Object[][]{};
    String[] titles = {
        "Code", "Description", "Rulling", "Page", 
        "MRP", "QPC", "Total Order", "Stock", "Shortage"
    };

    public DispatchPlanningSelfContained() {
        initComponents();
        jList1.addListSelectionListener((ListSelectionEvent e) -> {
            if (!e.getValueIsAdjusting()) {
                DefaultTableModel dtm = new DefaultTableModel(data, titles);

                int selection[] = jList1.getSelectedIndices();
                System.out.println("Selection Length = " + selection.length);
                for (int i = 0; i < selection.length; i++) {
                    dtm.addColumn(jList1.getModel().getElementAt(selection[i]));
                    System.out.println("selection [" + i + "] = " + 
                            jList1.getModel().getElementAt(selection[i]));
                }
                jTable1.setModel(dtm);
            }
        });
    }

    @SuppressWarnings("unchecked")
    private void initComponents() {

        jLabel4 = new JLabel();
        jScrollPane3 = new JScrollPane();
        jList1 = new JList<>();
        jLabel5 = new JLabel();
        jScrollPane2 = new JScrollPane();
        jTable1 = new JTable();

        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        jLabel4.setText("Pending Party Names");

        jList1.setModel(new AbstractListModel<String>() {
            String[] strings = {
                "Party 1", "Party 2", "Party 3", "Party 4", 
                "Party 5", "Party 6", "Party 7", "Party 8", "Party 9"
            };

            @Override
            public int getSize() {
                return strings.length;
            }

            @Override
            public String getElementAt(int i) {
                return strings[i];
            }
        });
        jScrollPane3.setViewportView(jList1);

        jLabel5.setText("Planning Results:");

        jTable1.setAutoCreateRowSorter(true);
        jTable1.setModel(new DefaultTableModel(data, titles));
        jScrollPane2.setViewportView(jTable1);

        GroupLayout layout = new GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
                layout.createParallelGroup(GroupLayout.Alignment.LEADING)
                .addGap(0, 967, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
                        .addGroup(layout.createSequentialGroup()
                                .addContainerGap()
                                .addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
                                        .addComponent(jScrollPane2)
                                        .addGroup(layout.createSequentialGroup()
                                                .addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
                                                        .addGroup(layout.createSequentialGroup()
                                                                .addGap(268, 268, 268)
                                                                .addComponent(jLabel4))
                                                        .addComponent(jLabel5))
                                                .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED)
                                                .addComponent(jScrollPane3, GroupLayout.PREFERRED_SIZE, 531, GroupLayout.PREFERRED_SIZE)
                                                .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED, 52, Short.MAX_VALUE)))
                                .addContainerGap()))
        );
        layout.setVerticalGroup(
                layout.createParallelGroup(GroupLayout.Alignment.LEADING)
                .addGap(0, 585, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
                        .addGroup(layout.createSequentialGroup()
                                .addContainerGap()
                                .addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
                                        .addGroup(layout.createSequentialGroup()
                                                .addComponent(jLabel4)
                                                .addGap(96, 96, 96)
                                                .addComponent(jLabel5))
                                        .addComponent(jScrollPane3, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
                                .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                .addComponent(jScrollPane2, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
                                .addContainerGap()))
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(() -> {
            new DispatchPlanningSelfContained().setVisible(true);
        });
    }
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private JLabel jLabel4;
    private JLabel jLabel5;
    private JList<String> jList1;
    private JScrollPane jScrollPane2;
    private JScrollPane jScrollPane3;
    private JTable jTable1;
    // End of variables declaration//GEN-END:variables
}

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