这是我的一个简单JTable的代码，具有多个搜索和排序。这可能是一个相对简单的问题但是当我运行代码时，我在引用＆＃34; aData＆＃34;时会出错。和＃34; aHeaders＆＃34;在我的＆＃34;私有DefaultTableModel模型＆＃34;。在这个小问题排序后，我会遇到任何其他错误或例外吗？即。的NullPointerException
import javax.swing.*;
import java.awt.*;
import java.io.*;
import java.lang.*;
import java.awt.event.*;
///////////
import javax.swing.border.EmptyBorder;
import javax.swing.event.*;
import javax.swing.text.Document;
import javax.swing.table.TableRowSorter;
import java.util.List;
import java.util.ArrayList;
import java.util.Comparator;
///////////
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import static javax.swing.JFrame.EXIT_ON_CLOSE;
import javax.swing.table.*;
public class JtableIe
{
JFrame myMainWindow = new JFrame("Compare Tables");
JPanel firstPanel = new JPanel();
JScrollPane myScrollTable;
JTable myTable;
JTextField srchFld1;
JTextField srchFld2;
TableRowSorter sorter;
JLabel srchLbl1 = new JLabel();
JLabel srchLbl2 = new JLabel();
public void runGUI()
{
myMainWindow.setBounds(10, 10, 1296, 756);
myMainWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
myMainWindow.setLayout(new GridLayout(1,1));
createFirstPanel();
myMainWindow.getContentPane().add(firstPanel);
myMainWindow.setVisible(true);
}
public void createFirstPanel()
{
firstPanel.setLayout(null);
srchLbl1.setLocation(0,0);
srchLbl1.setSize(150,26);
srchLbl1.setText("Name Search:");
firstPanel.add(srchLbl1);
srchLbl2.setLocation(660,0);
srchLbl2.setSize(150,26);
srchLbl2.setText("ID Search:");
firstPanel.add(srchLbl2);
String[] aHeaders = {"Name","ID","Number 1","Number 2","Time","Date"};
Object[][] aData = new Object[15][6];
myTable = new JTable(model);
///////Data////////
aData[0][0] = "John";
aData[0][1] = "JS96";
aData[0][2] = "1";
aData[0][3] = "186";
aData[0][4] = "1h 23m";
aData[0][5] = getJavaDate("12-11-2015");
aData[1][0] = "David";
aData[1][1] = "DB36";
aData[1][2] = "2";
aData[1][3] = "111852";
aData[1][4] = "2h 55m";
aData[1][5] = getJavaDate("12-11-2020");
aData[2][0] = "Daniel";
aData[2][1] = "DK73";
aData[2][2] = "3";
aData[2][3] = "2921";
aData[2][4] = "1h 55m";
aData[2][5] = getJavaDate("12-11-2014");
aData[3][0] = "Janis";
aData[3][1] = "JW84";
aData[3][2] = "4";
aData[3][3] = "6512";
aData[3][4] = "12h 26m";
aData[3][5] = getJavaDate("13-11-2015");
aData[4][0] = "Adam";
aData[4][1] = "AF98";
aData[4][2] = "5";
aData[4][3] = "7524";
aData[4][4] = "5h 47m";
aData[4][5] = getJavaDate("11-11-2015");
aData[5][0] = "Matthew";
aData[5][1] = "MB55";
aData[5][2] = "6";
aData[5][3] = "4989";
aData[5][4] = "80h 30m";
aData[5][5] = getJavaDate("11-11-2015");
aData[6][0] = "Lewis";
aData[6][1] = "LS23";
aData[6][2] = "7";
aData[6][3] = "56321";
aData[6][4] = "880h 20m";
aData[6][5] = getJavaDate("11-11-2015");
aData[7][0] = "Mark";
aData[7][1] = "ML49";
aData[7][2] = "8";
aData[7][3] = "97456";
aData[7][4] = "8h 42m";
aData[7][5] = getJavaDate("11-11-2015");
aData[8][0] = "Josh";
aData[8][1] = "JT67";
aData[8][2] = "9";
aData[8][3] = "82135";
aData[8][4] = "56h 13m";
aData[8][5] = getJavaDate("11-11-2015");
aData[9][0] = "Oliver";
aData[9][1] = "OC98";
aData[9][2] = "10";
aData[9][3] = "152";
aData[9][4] = "9h 9m";
aData[9][5] = getJavaDate("11-11-2015");
aData[10][0] = "Tom";
aData[10][1] = "TS97";
aData[10][2] = "11";
aData[10][3] = "100";
aData[10][4] = "0h 0m";
aData[10][5] = getJavaDate("11-11-2015");
aData[11][0] = "Emma";
aData[11][1] = "EBS74";
aData[11][2] = "12";
aData[11][3] = "200";
aData[11][4] = "0h 30m";
aData[11][5] = getJavaDate("11-11-2015");
aData[12][0] = "Lucy";
aData[12][1] = "LK02";
aData[12][2] = "13";
aData[12][3] = "256";
aData[12][4] = "7h 00m";
aData[12][5] = getJavaDate("11-11-2015");
aData[13][0] = "Patrick";
aData[13][1] = "PM38";
aData[13][2] = "14";
aData[13][3] = "258";
aData[13][4] = "2h 00m";
aData[13][5] = getJavaDate("11-11-2015");
aData[14][0] = "Nicola";
aData[14][1] = "NB70";
aData[14][2] = "15";
aData[14][3] = "987";
aData[14][4] = "100h 56m";
aData[14][5] = getJavaDate("11-11-2015");
//////////////
myTable.setAutoCreateRowSorter(true);
sorter = new TableRowSorter(myTable.getModel());
List sortKeys = new ArrayList();
sortKeys.add(new RowSorter.SortKey(0, SortOrder.ASCENDING));
sorter.setSortKeys(sortKeys);
sorter.setComparator(2, new AlphanumComparator());
sorter.setComparator(3, new AlphanumComparator());
sorter.setComparator(4, new AlphanumComparator());
setRenderers();
myTable.setRowSorter(sorter);
DefaultRowSorter sorter = (DefaultRowSorter) myTable.getRowSorter();
myScrollTable = new JScrollPane(myTable);
myScrollTable.setSize(1296,756);
myScrollTable.setLocation(0,25);
System.out.println("Creating compare table");
srchFld1 = new JTextField(10);
srchFld1.setSize(550,26);
srchFld1.setLocation(100,0);
srchFld1.setToolTipText("Enter Name");
firstPanel.add(srchFld1);
srchFld2 = new JTextField(10);
srchFld2.setSize(550,26);
srchFld2.setLocation(740,0);
srchFld2.setToolTipText("Enter ID");
firstPanel.add(srchFld2);
//////////////////////
Document doc = srchFld1.getDocument();
DocumentListener listener = new DocumentListener() {
@Override
public void insertUpdate(DocumentEvent e)
{
newFilter();
}
@Override
public void removeUpdate(DocumentEvent e)
{
newFilter();
}
@Override
public void changedUpdate(DocumentEvent e)
{
newFilter();
}
};
doc.addDocumentListener(listener);
///////////////
Document docb = srchFld2.getDocument();
DocumentListener listenerb = new DocumentListener() {
@Override
public void insertUpdate(DocumentEvent e)
{
newFilter();
}
@Override
public void removeUpdate(DocumentEvent e)
{
newFilter();
}
@Override
public void changedUpdate(DocumentEvent e)
{
newFilter();
}
};
docb.addDocumentListener(listenerb);
///////////////
firstPanel.add(myScrollTable);
}
private DefaultTableModel model = new DefaultTableModel(aData, aHeaders) {
@Override
public Class<?> getColumnClass(int column)
{
return getValueAt(5, column).getClass();
}
};
private static final DateFormat DATE_FORMAT = new SimpleDateFormat("dd/MM/yyyy");
private void setRenderers() {
myTable.setDefaultRenderer(Date.class, new DateRenderer());
}
private Date getJavaDate(String s) {
try
{
SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");
Date d = sdf.parse(s);
return d;
}
catch (ParseException ex)
{
Logger.getLogger(TableBasic.class.getName()).log(Level.SEVERE, null, ex);
return null;
}
}
private void newFilter()
{
RowFilter rf = null;
try
{
List<RowFilter<Object,Object>> filters = new ArrayList<RowFilter<Object,Object>>(2);
filters.add(RowFilter.regexFilter(srchFld1.getText(), 0));
filters.add(RowFilter.regexFilter(srchFld2.getText(), 1));
rf = RowFilter.andFilter(filters);
}
catch (java.util.regex.PatternSyntaxException e)
{
return;
}
sorter.setRowFilter(rf);
}
public static void main(String[] args)
{
JtableIe ji = new JtableIe();
ji.runGUI();
}
private class DateRenderer extends DefaultTableCellRenderer
{
private static final long serialVersionUID = 1L;
@Override
public Component getTableCellRendererComponent(JTable myTable, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
super.getTableCellRendererComponent(myTable, value, isSelected, hasFocus, row, column);
if (!(value instanceof Date)) {
return this;
}
setText(DATE_FORMAT.format((Date) value));
return this;
}
}
}
AlphanumComparator代码
/*
* The Alphanum Algorithm is an improved sorting algorithm for strings
* containing numbers. Instead of sorting numbers in ASCII order like
* a standard sort, this algorithm sorts numbers in numeric order.
*
* The Alphanum Algorithm is discussed at http://www.DaveKoelle.com
*
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
import java.util.Comparator;
/**
* This is an updated version with enhancements made by Daniel Migowski,
* Andre Bogus, and David Koelle
*
* To convert to use Templates (Java 1.5+):
* - Change "implements Comparator" to "implements Comparator<String>"
* - Change "compare(Object o1, Object o2)" to "compare(String s1, String s2)"
* - Remove the type checking and casting in compare().
*
* To use this class:
* Use the static "sort" method from the java.util.Collections class:
* Collections.sort(your list, new AlphanumComparator());
*/
public class AlphanumComparator implements Comparator
{
private final boolean isDigit(char ch)
{
return ch >= 48 && ch <= 57;
}
/** Length of string is passed in for improved efficiency (only need to calculate it once) **/
private final String getChunk(String s, int slength, int marker)
{
StringBuilder chunk = new StringBuilder();
char c = s.charAt(marker);
chunk.append(c);
marker++;
if (isDigit(c))
{
while (marker < slength)
{
c = s.charAt(marker);
if (!isDigit(c))
break;
chunk.append(c);
marker++;
}
} else
{
while (marker < slength)
{
c = s.charAt(marker);
if (isDigit(c))
break;
chunk.append(c);
marker++;
}
}
return chunk.toString();
}
public int compare(Object o1, Object o2)
{
if (!(o1 instanceof String) || !(o2 instanceof String))
{
return 0;
}
String s1 = (String)o1;
String s2 = (String)o2;
int thisMarker = 0;
int thatMarker = 0;
int s1Length = s1.length();
int s2Length = s2.length();
while (thisMarker < s1Length && thatMarker < s2Length)
{
String thisChunk = getChunk(s1, s1Length, thisMarker);
thisMarker += thisChunk.length();
String thatChunk = getChunk(s2, s2Length, thatMarker);
thatMarker += thatChunk.length();
// If both chunks contain numeric characters, sort them numerically
int result = 0;
if (isDigit(thisChunk.charAt(0)) && isDigit(thatChunk.charAt(0)))
{
// Simple chunk comparison by length.
int thisChunkLength = thisChunk.length();
result = thisChunkLength - thatChunk.length();
// If equal, the first different number counts
if (result == 0)
{
for (int i = 0; i < thisChunkLength; i++)
{
result = thisChunk.charAt(i) - thatChunk.charAt(i);
if (result != 0)
{
return result;
}
}
}
} else
{
result = thisChunk.compareTo(thatChunk);
}
if (result != 0)
return result;
}
return s1Length - s2Length;
}
}
答案 0 :(得分：2)
你不能仅仅参考＆＃34; model＆＃34;那样的。
您的代码顺序错误。首先需要使用列名创建列数组，然后使用数据创建数据数组。然后使用这些变量创建表模型并将表模型添加到表中。
代码可能类似于：
String[] aHeaders = {"Name","ID","Number 1","Number 2","Time","Date"};
Object[][] aData = new Object[15][6];
///////Data////////
aData[0][0] = "John";
aData[0][1] = "JS96";
aData[0][2] = "1";
aData[0][3] = "186";
aData[0][4] = "1h 23m";
aData[0][5] = getJavaDate("12-11-2015");
...
DefaultTableModel model = new DefaultTableModel(aData, aHeaders)
{
@Override
public Class<?> getColumnClass(int column)
{
switch (column)
{
case 5: return Date.class;
default: return Object.class;
}
}
};
myTable = new JTable( model );