我已经写了一个带有表格的小程序，我已经尝试并阅读了很多文档和答案，但我真的不明白我做错了什么，因为第4列仍然是可编辑的，没有事件是当我选择行时触发...
public class Main extends JFrame{
/**
*
*/
private static final long serialVersionUID = 1L;
private JLabel banner;
private String[] tecnici;
private String[] columnNames;
private Object[][] data;
private JTable table;
Map<String,List<Cliente>> clientiList;
private Container pane = getContentPane();
GroupLayout gl = new GroupLayout(pane);
Main(){
init();
}
private void init(){
ImageIcon webIcon = new ImageIcon(Constants.WORK_GUI_LOGO);
setIconImage(webIcon.getImage());
setTitle(Constants.WORK_GUI_TITLE);
setSize(300, 200);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
banner=new JLabel("", webIcon, JLabel.CENTER);
MenuBar menu=new MenuBar();
setJMenuBar(menu.getMenuBar());
System.out.println("Leggo i tecnici dal db");
tecnici=new String[] {"Tarzan","Cita","Jane"};
clientiList=new HashMap();
for(String tec:tecnici){
List<Cliente> l=new ArrayList<>();
Cliente c=new Cliente();
c.setConsultivoIncassi(1000);
c.setNome("Clnl ross");
c.setPreventivoIncassi(1000);
l.add(c);
c=new Cliente();
c.setConsultivoIncassi(2000);
c.setNome("Clnl ross");
c.setPreventivoIncassi(2000);
l.add(c);
clientiList.put(tec, l);
}
data=createTableFromMap(clientiList);
columnNames=new String[]{"Tecs","Customer","count","credit"};
table=new JTable(data, columnNames){
public boolean isCellEditable(int row, int col) {
//where i want to make editable only the 4th col
return col==4;
}
};
table.getSelectionModel().addListSelectionListener(new TableSelectionListener());
createWindowLayout(
banner,
new JLabel("Tecnici"),
new JCheckBox(tecnici[0]),
new JCheckBox(tecnici[1]),
new JCheckBox(tecnici[2]),
new JTable(data, columnNames));
}
public void createWindowLayout(JComponent... arg) {
pane = getContentPane();
gl = new GroupLayout(pane);
pane.setLayout(gl);
gl.setAutoCreateContainerGaps(true);
gl.setAutoCreateGaps(true);
gl.setHorizontalGroup(gl.createParallelGroup()
.addComponent(arg[0])
.addGroup(gl.createSequentialGroup()
.addComponent(arg[1])
.addGroup(gl.createParallelGroup(Alignment.LEADING)
.addComponent(arg[2])
.addComponent(arg[3])
.addComponent(arg[4])
)
)
.addComponent(arg[5])
);
gl.setVerticalGroup(gl.createSequentialGroup()
.addComponent(arg[0])
.addGroup(gl.createParallelGroup()
.addComponent(arg[1])
.addComponent(arg[2]))
.addComponent(arg[3])
.addComponent(arg[4])
.addComponent(arg[5])
);
pack();
}
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
Main ex = new Main();
ex.setVisible(true);
});
}
private Object[][] createTableFromMap(Map<String,List<Cliente>> clienti ){
Iterator it= clienti.entrySet().iterator();
Object[][] tabella=new Object[clienti.size()][4];
int counter=0;
while(it.hasNext()){
Map.Entry entry=(Map.Entry) it.next();
for(Cliente c:(List<Cliente>)entry.getValue()){
tabella[counter]=new Object[]{entry.getKey(),
c.getNome(),
c.getPreventivoIncassi(),
c.getConsultivoIncassi()};
}
counter++;
}
return tabella;
}
class TableSelectionListener implements ListSelectionListener{
@Override
public void valueChanged(ListSelectionEvent arg0) {
String selectedData = null;
int[] selectedRow = table.getSelectedRows();
int[] selectedColumns = table.getSelectedColumns();
for (int i = 0; i < selectedRow.length; i++) {
for (int j = 0; j < selectedColumns.length; j++) {
selectedData = (String) table.getValueAt(selectedRow[i], selectedColumns[j]);
}
}
System.out.println("Selected: " + selectedData);
}
}
}
答案 0 :(得分：2)
仔细查看您的代码并在此处发表评论：
public boolean isCellEditable(int row, int col) {
//where i want to make editable only the 4th row
return col==4;
}
评论不符合代码吗？你的方法是检查col应该检查行，不是吗？ e.g：
public boolean isCellEditable(int row, int col) {
//where i want to make editable only the 4th row
return row == 4; // ****** note change ******
}
MCVE＆＃39;代码：
import java.awt.Container;
import java.awt.EventQueue;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.swing.*;
import javax.swing.GroupLayout.Alignment;
import javax.swing.event.*;
public class Main extends JFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
private JLabel banner;
private String[] tecnici;
private String[] columnNames;
private Object[][] data;
private JTable table;
Map<String,List<Cliente>> clientiList;
private Container pane = getContentPane();
GroupLayout gl = new GroupLayout(pane);
Main(){
init();
}
private void init(){
ImageIcon webIcon = new ImageIcon(Constants.WORK_GUI_LOGO);
setIconImage(webIcon.getImage());
setTitle(Constants.WORK_GUI_TITLE);
setSize(300, 200);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
banner=new JLabel("", webIcon, JLabel.CENTER);
MenuBar menu=new MenuBar();
setJMenuBar(menu.getMenuBar());
System.out.println("Leggo i tecnici dal db");
tecnici=new String[] {"Tarzan","Cita","Jane"};
clientiList=new HashMap<>();
for(String tec:tecnici){
List<Cliente> l=new ArrayList<>();
Cliente c=new Cliente();
c.setConsultivoIncassi(1000);
c.setNome("Clnl ross");
c.setPreventivoIncassi(1000);
l.add(c);
c=new Cliente();
c.setConsultivoIncassi(2000);
c.setNome("Clnl ross");
c.setPreventivoIncassi(2000);
l.add(c);
clientiList.put(tec, l);
}
data=createTableFromMap(clientiList);
columnNames=new String[]{"Tecs","Customer","count","credit"};
table=new JTable(data, columnNames){
public boolean isCellEditable(int row, int col) {
//where i want to make editable only the 4th row
return col==4;
}
};
table.getSelectionModel().addListSelectionListener(new TableSelectionListener());
createWindowLayout(
banner,
new JLabel("Tecnici"),
new JCheckBox(tecnici[0]),
new JCheckBox(tecnici[1]),
new JCheckBox(tecnici[2]),
new JTable(data, columnNames));
}
public void createWindowLayout(JComponent... arg) {
pane = getContentPane();
gl = new GroupLayout(pane);
pane.setLayout(gl);
gl.setAutoCreateContainerGaps(true);
gl.setAutoCreateGaps(true);
gl.setHorizontalGroup(gl.createParallelGroup()
.addComponent(arg[0])
.addGroup(gl.createSequentialGroup()
.addComponent(arg[1])
.addGroup(gl.createParallelGroup(Alignment.LEADING)
.addComponent(arg[2])
.addComponent(arg[3])
.addComponent(arg[4])
)
)
.addComponent(arg[5])
);
gl.setVerticalGroup(gl.createSequentialGroup()
.addComponent(arg[0])
.addGroup(gl.createParallelGroup()
.addComponent(arg[1])
.addComponent(arg[2]))
.addComponent(arg[3])
.addComponent(arg[4])
.addComponent(arg[5])
);
pack();
}
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
Main ex = new Main();
ex.setVisible(true);
});
}
private Object[][] createTableFromMap(Map<String,List<Cliente>> clienti ){
Iterator it= clienti.entrySet().iterator();
Object[][] tabella=new Object[clienti.size()][4];
int counter=0;
while(it.hasNext()){
Map.Entry entry=(Map.Entry) it.next();
for(Cliente c:(List<Cliente>)entry.getValue()){
tabella[counter]=new Object[]{entry.getKey(),
c.getNome(),
c.getPreventivoIncassi(),
c.getConsultivoIncassi()};
}
counter++;
}
return tabella;
}
class TableSelectionListener implements ListSelectionListener{
@Override
public void valueChanged(ListSelectionEvent arg0) {
String selectedData = null;
int[] selectedRow = table.getSelectedRows();
int[] selectedColumns = table.getSelectedColumns();
for (int i = 0; i < selectedRow.length; i++) {
for (int j = 0; j < selectedColumns.length; j++) {
selectedData = (String) table.getValueAt(selectedRow[i], selectedColumns[j]);
}
}
System.out.println("Selected: " + selectedData);
}
}
private static class Cliente {
private String nome;
private int preventivoIncassi;
private int consultivoIncassi;
public String getNome() {
return nome;
}
public void setPreventivoIncassi(int preventivoIncassi) {
this.preventivoIncassi = preventivoIncassi;
}
public void setNome(String nome) {
this.nome = nome;
}
public void setConsultivoIncassi(int consultivoIncassi) {
this.consultivoIncassi = consultivoIncassi;
}
public int getConsultivoIncassi() {
return consultivoIncassi;
}
public int getPreventivoIncassi() {
return preventivoIncassi;
}
}
private static class Constants {
public static final String WORK_GUI_LOGO = null;
public static final String WORK_GUI_TITLE = null;
}
private static class MenuBar {
public JMenuBar getMenuBar() {
// TODO Auto-generated method stub
return null;
}
}
}
答案 1 :(得分：2)
return col==4;
你有没有做过任何基本的调试，看看“col”变量的值是多少？当您遇到问题时，您应该做的第一件事是使用System.out.println（...）来显示该值，以便您可以确定您的if条件是否正确。
如果你这样做，你会注意到两件事：
永远不会执行代码的原因是因为你有两个表。您使用重写的isCellEditable（）方法创建的第一个。但是你永远不会将该表添加到GUI中，因此这是死代码。然后创建一个添加到GUI的第二个表：
new JCheckBox(tecnici[2]),
new JTable(data, columnNames));
所以摆脱上面的陈述，只需使用：
new JCheckBox(tecnici[2]),
//new JTable(data, columnNames));
table);
由于表变量是具有自定义方法的表。