所以riffing什麼安德魯·湯普森說，你可以顯示和一個JTable中改變你的標準，因爲你似乎是想要創建和顯示錶格數據，數據可以隨程序運行並受用戶控制而改變。雖然這樣做會帶來一些挑戰，因爲好處與損失似乎是互補的屬性，這意味着如果一個是真的，另一個必須是假的，並且這最容易用單個布爾表示，但是接下來如何連接JTable及其模型如果一行數據包含單個布爾值，以及如何允許用戶更改這些屬性，然後在兩列中顯示更改，那麼它將顯示兩個屬性？
因此，在創建表模型之前，我首先創建了一個類MyCriterion來表示一行數據。它有兩個字段，一個名稱字符串和一個有益的布爾值。再次，如果有利的話，則JTable的「效益」欄應顯示一個複選標記，「損失」欄應該爲空，反之亦然。類：
public class MyCriterion {
private String name;
private boolean beneficial;
public MyCriterion(String name) {
this(name, false);
}
public MyCriterion(String name, boolean beneficial) {
this.name = name;
this.beneficial = beneficial;
}
public String getName() {
return name;
}
public boolean isBeneficial() {
return beneficial;
}
public void setBeneficial(boolean beneficial) {
this.beneficial = beneficial;
}
@Override
public String toString() {
return "MyCriterion [name=" + name + ", beneficial=" + beneficial + "]";
}
}
接下來，表格模型，因爲它是非常容易擴展的DefaultTableModel，比它擴展AbstractTableModel的，這是我決定的事，但同樣，給它3列，最後兩個依賴單個boolan的狀態，MyCriterion的beneficial字段。我「硬編碼」列標題：
public static final String[] COLUMN_NAMES = { "Type of Criteria", "Benefit", "Loss" };
，並通過他們進入超類的構造函數的頭一個數組和行數的int，並且初始行數當然是0的：
public CriteriaTableModel() {
super(COLUMN_NAMES, 0);
}
的getColumnClass(int columnIndex)應該返回String.class如果器的columnIndex爲0，否則將返回一個Boolean.class，而這樣做會讓JTable中作爲JCheckBoxes顯示最後兩個值。這並不像將它們顯示爲JRadioButton那樣乾淨，但它很簡單並且很有效。
我給模型一個public void addCriterion(MyCriterion myCriterion)方法，使添加一行變得很簡單。它增加了一個MyCriterion值進入超級模型到第0列：
public void addCriterion(MyCriterion myCriterion) {
super.addRow(new MyCriterion[] {myCriterion});
}
這意味着，該表的模型，這是由超級舉行的真正的「核」，其實是有一列模型，一個持有MyCriterion對象，所以我不得不重寫setValue(...)和getValueAt(...)方法，這個單一數據列轉換爲顯示器的3列：
@Override
public void setValueAt(Object aValue, int row, int column) {
MyCriterion myCriterion = (MyCriterion) super.getValueAt(row, 0);
boolean boolValue = (boolean) aValue;
switch (column) {
case 1:
myCriterion.setBeneficial(boolValue);
break;
case 2:
myCriterion.setBeneficial(!boolValue);
default:
break;
}
super.setValueAt(myCriterion, row, 0);
fireTableRowsUpdated(row, row);
}
@Override
public Object getValueAt(int row, int column) {
MyCriterion myCriterion = (MyCriterion) super.getValueAt(row, 0);
switch (column) {
case 0:
return myCriterion.getName();
case 1:
return myCriterion.isBeneficial();
case 2:
return !myCriterion.isBeneficial();
default:
String text = "Invalid column: " + column;
throw new IllegalArgumentException(text);
}
}
public MyCriterion getValueAt(int row) {
return (MyCriterion) super.getValueAt(row, 0);
}
我的整個表模型類：
import java.util.ArrayList;
import java.util.List;
import javax.swing.table.DefaultTableModel;
public @SuppressWarnings("serial")
class CriteriaTableModel extends DefaultTableModel {
public static final String[] COLUMN_NAMES = { "Type of Criteria", "Benefit", "Loss" };
public CriteriaTableModel() {
super(COLUMN_NAMES, 0);
}
@Override
public Class<?> getColumnClass(int columnIndex) {
switch (columnIndex) {
case 0:
return String.class;
default:
return Boolean.class;
}
}
public void addCriterion(MyCriterion myCriterion) {
super.addRow(new MyCriterion[] {myCriterion});
}
@Override
public void setValueAt(Object aValue, int row, int column) {
MyCriterion myCriterion = (MyCriterion) super.getValueAt(row, 0);
boolean boolValue = (boolean) aValue;
switch (column) {
case 1:
myCriterion.setBeneficial(boolValue);
break;
case 2:
myCriterion.setBeneficial(!boolValue);
default:
break;
}
super.setValueAt(myCriterion, row, 0);
fireTableRowsUpdated(row, row);
}
@Override
public boolean isCellEditable(int row, int column) {
return column > 0;
}
@Override
public Object getValueAt(int row, int column) {
MyCriterion myCriterion = (MyCriterion) super.getValueAt(row, 0);
switch (column) {
case 0:
return myCriterion.getName();
case 1:
return myCriterion.isBeneficial();
case 2:
return !myCriterion.isBeneficial();
default:
String text = "Invalid column: " + column;
throw new IllegalArgumentException(text);
}
}
public MyCriterion getValueAt(int row) {
return (MyCriterion) super.getValueAt(row, 0);
}
public List<MyCriterion> getCriteria() {
List<MyCriterion> criteriaList = new ArrayList<>();
for (int i = 0; i < getRowCount(); i++) {
criteriaList.add(getValueAt(i));
}
return criteriaList;
}
}
最後GUI來顯示所有這一點，並有按鈕，允許從JTable的添加和移除列：
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import javax.swing.*;
@SuppressWarnings("serial")
public class CriteriaList extends JPanel {
private CriteriaTableModel myModel = new CriteriaTableModel();
private JTable criteriaTable = new JTable(myModel);
private JTextField criterionNameField = new JTextField(10);
private JCheckBox beneficialCB = new JCheckBox("Beneficial");
public CriteriaList() {
criteriaTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
myModel.addCriterion(new MyCriterion("Foo", true));
myModel.addCriterion(new MyCriterion("Bar", false));
JPanel bottomPanel = new JPanel();
bottomPanel.add(new JLabel("Criterion:"));
bottomPanel.add(criterionNameField);
bottomPanel.add(beneficialCB);
bottomPanel.add(new JButton(new AddCriterion("Add")));
bottomPanel.add(new JButton(new RemoveCriterion("Remove")));
bottomPanel.add(new JButton(new DisplayCriterion("Display")));
setLayout(new BorderLayout());
add(new JScrollPane(criteriaTable));
add(bottomPanel, BorderLayout.PAGE_END);
}
private class RemoveCriterion extends AbstractAction {
public RemoveCriterion(String name) {
super(name);
int mnemonic = (int) name.charAt(0);
putValue(MNEMONIC_KEY, mnemonic);
}
@Override
public void actionPerformed(ActionEvent e) {
int row = criteriaTable.getSelectedRow();
if (row >= 0) {
myModel.removeRow(row);
}
}
}
private class DisplayCriterion extends AbstractAction {
public DisplayCriterion(String name) {
super(name);
int mnemonic = (int) name.charAt(0);
putValue(MNEMONIC_KEY, mnemonic);
}
@Override
public void actionPerformed(ActionEvent e) {
for (MyCriterion criterion : myModel.getCriteria()) {
System.out.println(criterion);
}
}
}
private class AddCriterion extends AbstractAction {
public AddCriterion(String name) {
super(name);
int mnemonic = (int) name.charAt(0);
putValue(MNEMONIC_KEY, mnemonic);
}
@Override
public void actionPerformed(ActionEvent e) {
String name = criterionNameField.getText();
boolean beneficial = beneficialCB.isSelected();
MyCriterion myCriterion = new MyCriterion(name, beneficial);
myModel.addCriterion(myCriterion);
criterionNameField.selectAll();
criterionNameField.requestFocusInWindow();
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> createAndShowGui());
}
private static void createAndShowGui() {
CriteriaList mainPanel = new CriteriaList();
JFrame frame = new JFrame("Criteria List");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
}
似乎這將是最適合使用'JTable'到顯示標準..爲更好地提供幫助，請張貼[MCVE]或[簡短，獨立，正確的示例]（http://www.sscce.org/）。 –
請詳細說明問題，以便我們可以更全面地瞭解它。 –
好的，所以我決定玩@ AndrewThompson的建議，看看我是否可以讓JTable顯示你之後的數據。請看下面的代碼。 –