为什么我的JTable没有出现？

编程入门行业动态更新时间:2024-10-09 20:24:11

本文介绍了为什么我的JTable没有出现？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！问题描述

我的JTable没有显示。我不知道为什么。也许你能帮我。我有一个窗口类，它有一个右边的面板，右边的面板应该显示一个带有模型数据的表。我已经使用了虚拟数据开始，例如月和天。

这里是Right Panel类

import model.*; import java.awt.*; import java.awt.event.*; //import java.text.*; import javax.swing.*; public class RightPanel extends JPanel implements View { private TablePanel songsnartists = new TablePanel(); Shop shop; public RightPanel(Shop ourShop) { shop = ourShop; setup(); build(); setVisible(true); } private void setup() { setPreferredSize(new Dimension(300, 300)); setLayout(new GridLayout(3,2)); setBorder(BorderFactory.createLineBorder(Color.blue)); } private void build() { add(songsnartists); } public void update() {} }

/*到目前为止，只需尝试将表格面板添加到我的右侧面板就足够简单了*/

下面是我创建的TablePanel类。它继承JTable并使用继承AbstractTableModel的私有类MyTableModel，以便我创建不可编辑的表。

import javax.swing.*; import javax.swing.table.*; public class TablePanel extends JTable { //private int ROWS = 3; //private int COLUMNS = 2; private final String [][] data = {{"Jan", "31"}, {"Feb","28"},{"Mar","31"}}; private final String[] headers = {"Month", "Days"}; JTable table; public TablePanel() { table = new JTable(new MyTableModel(data, headers)); JTableHeader header = table.getTableHeader(); //header.setBackground(Color.blue); setVisible(true); } private class MyTableModel extends AbstractTableModel { private String[] columnNames = {"Month", "Days"}; private String[][] data = {{"Jan", "31"}, {"Feb","28"},{"Mar","31"}}; public MyTableModel(String [][] data, String [] header) { int rows, cols, rowCounter, colCounter; rows = getRowCount(); cols = getColumnCount(); for (rowCounter=0; rowCounter < rows; rowCounter++) { for (colCounter=0; colCounter < cols; colCounter++) { setValueAt(data[rowCounter][colCounter],rowCounter,colCounter); } } } public int getColumnCount() { return columnNames.length; } public int getRowCount() { return data.length; } public String getColumnName(int col) { return columnNames[col]; } public Object getValueAt(int row, int col) { return data[row][col]; } public Class getColumnClass(int c) { return getValueAt(0, c).getClass(); } public boolean isCellEditable(int row, int col) { return false; } } }