JavaSwing将对象添加到表中
我很难将对象添加到表中。 我的表有4列,我试图添加的对象是通过用户输入创建的。 当用户单击“验证”按钮时,我试图将其添加到表中。 (我没有发布我所有的代码,可能太长了,但这里有重要的部分)JavaSwing将对象添加到表中,java,swing,Java,Swing,我很难将对象添加到表中。 我的表有4列,我试图添加的对象是通过用户输入创建的。 当用户单击“验证”按钮时,我试图将其添加到表中。 (我没有发布我所有的代码,可能太长了,但这里有重要的部分) 假设您的行和列如下所示,那么您唯一缺少的就是一个TableModel。因此,添加到JTable的整个结构必须是这样的 String[] columnNames = {"First Name", "Last Name", "Sport", "# of Years"
假设您的行和列如下所示,那么您唯一缺少的就是一个TableModel。因此,添加到JTable的整个结构必须是这样的
String[] columnNames = {"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian"};
Object[][] rowData = {
{"Kathy", "Smith",
"Snowboarding", new Integer(5), new Boolean(false)},
{"John", "Doe",
"Rowing", new Integer(3), new Boolean(true)},
{"Sue", "Black",
"Knitting", new Integer(2), new Boolean(false)},
{"Jane", "White",
"Speed reading", new Integer(20), new Boolean(true)},
{"Joe", "Brown",
"Pool", new Integer(10), new Boolean(false)}
};
JTable table = new JTable();
TableModel dataModel = new AbstractTableModel() {
public String getColumnName(int col) {
return columnNames[col].toString();
}
public int getRowCount() { return rowData.length; }
public int getColumnCount() { return columnNames.length; }
public Object getValueAt(int row, int col) {
return rowData[row][col];
}
public boolean isCellEditable(int row, int col)
{ return true; }
public void setValueAt(Object value, int row, int col) {
rowData[row][col] = value;
fireTableCellUpdated(row, col);
}
};
table.setModel(dataModel);
如果你有计划地尝试这段代码,你会发现它工作得非常好。但您只需使其与您的代码兼容(因为我对您的代码一无所知,所以无法将您的代码用作示例)使用
table=new JTable(行、列名称)
在幕后构建一个DefaultTableModel
DefaultTableModel
以非结构化的方式管理单个行和列,这意味着您必须分解任何对象值,并将其推送到模型中,然后根据从表中提取的数据重新组合任何对象
这会适得其反,尤其是当您已经有了一个包含要管理的基本数据的对象时
更好的解决方案是定义并使用您自己的
TableModel
,该模型设计用于管理对象本身
例如
public static class CardTableModel extends AbstractTableModel {
protected static String[] COLUMN_NAMES = {"Card type", "Account Number","Card Number", "Amount", "Select"};
protected static Class[] COLUMN_CLASSES = {String.class, Integer.class, Integer.class, Double.class, Boolean.class};
private Set<Integer> selected;
private List<Card> cards;
public CardTableModel() {
cards = new ArrayList<>(25);
selected = new TreeSet<Integer>();
}
@Override
public int getRowCount() {
return cards.size();
}
@Override
public int getColumnCount() {
return COLUMN_NAMES.length;
}
@Override
public String getColumnName(int column) {
return COLUMN_NAMES[column];
}
@Override
public Class<?> getColumnClass(int columnIndex) {
return COLUMN_CLASSES[columnIndex];
}
@Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
return columnIndex == 4;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
Card card = cards.get(rowIndex);
switch (columnIndex) {
case 0: return card.getCartType().toString();
case 1: return card.getAccountNumber();
case 2: return card.getCardNumber();
case 3: return card.getAmmount();
case 4: return selected.contains(rowIndex);
}
return null;
}
@Override
public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
if (columnIndex != 4) {
return;
}
if (!(aValue instanceof Boolean)) {
return;
}
boolean isSelected = (Boolean)aValue;
if (isSelected) {
selected.add(rowIndex);
} else {
selected.remove(rowIndex);
}
fireTableCellUpdated(rowIndex, columnIndex);
}
public void add(Card card) {
int index = cards.size();
cards.add(card);
fireTableRowsInserted(index, index);
}
public Card cardAt(int rowIndex) {
return cards.get(rowIndex);
}
}
更好的解决方案是定义一个自定义表,该表维护要显示的对象列表(根据需要具有可变功能)。这样,模型就可以决定如何最好地显示对象对不起,我是swing新手,我不知道如何自定义表格,谢谢<代码>我不确定如何自定义表-请参阅以获取逐步示例。或者将RowTableModel用作通用的TableModel。噢!我明白了,我真的不知道如何使用桌子,非常感谢<代码>新JTable(行、列名称)将在幕后创建一个
DefaultTableModel
,因此您只需复制已经可用的功能,而无需添加任何有用的功能哇!我懂了!所以,如果我想实现那个代码,我可以在知道CardTableModel模型的情况下执行table.setModel(model)吗?或者我又错了,因为CardModel(间接地)是一个TableModel,是的,你可以在任何需要TableModel的地方使用它。但是请记住,如果您想使用它的特定功能(如添加和获取),您需要将其转换回CardLayout或维护您自己的引用it。嗯,我理解您的代码,但不知何故我无法实现它。。我只是想有一个表来显示输入的用户信息。。。我想我全搞错了:(@GooseLooking我添加了一个可运行的示例,并(在示例中)更正了一个逻辑错误我成功实现了cardtable模型,我只需要使用模型来调整它。添加(卡片-新卡片),但现在我在添加多行时遇到问题,因此我将进行调查。感谢您的示例,它们真的很有帮助!!
public static class CardTableModel extends AbstractTableModel {
protected static String[] COLUMN_NAMES = {"Card type", "Account Number","Card Number", "Amount", "Select"};
protected static Class[] COLUMN_CLASSES = {String.class, Integer.class, Integer.class, Double.class, Boolean.class};
private Set<Integer> selected;
private List<Card> cards;
public CardTableModel() {
cards = new ArrayList<>(25);
selected = new TreeSet<Integer>();
}
@Override
public int getRowCount() {
return cards.size();
}
@Override
public int getColumnCount() {
return COLUMN_NAMES.length;
}
@Override
public String getColumnName(int column) {
return COLUMN_NAMES[column];
}
@Override
public Class<?> getColumnClass(int columnIndex) {
return COLUMN_CLASSES[columnIndex];
}
@Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
return columnIndex == 4;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
Card card = cards.get(rowIndex);
switch (columnIndex) {
case 0: return card.getCartType().toString();
case 1: return card.getAccountNumber();
case 2: return card.getCardNumber();
case 3: return card.getAmmount();
case 4: return selected.contains(rowIndex);
}
return null;
}
@Override
public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
if (columnIndex != 4) {
return;
}
if (!(aValue instanceof Boolean)) {
return;
}
boolean isSelected = (Boolean)aValue;
if (isSelected) {
selected.add(rowIndex);
} else {
selected.remove(rowIndex);
}
fireTableCellUpdated(rowIndex, columnIndex);
}
public void add(Card card) {
int index = cards.size();
cards.add(card);
fireTableRowsInserted(index, index);
}
public Card cardAt(int rowIndex) {
return cards.get(rowIndex);
}
}
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.Set;
import java.util.TreeSet;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.AbstractTableModel;
public class Test {
public static void main(String[] args) {
new Test();
}
private CardTableModel model;
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
model = new CardTableModel();
JTable table = new JTable(model);
JButton btn = new JButton("Add");
btn.addActionListener(new ActionListener() {
private Random rnd = new Random();
@Override
public void actionPerformed(ActionEvent e) {
Card.CardType type;
int accountNumber = rnd.nextInt();
int cardNumnber = rnd.nextInt();
double amount = rnd.nextDouble();
if (rnd.nextBoolean()) {
type = Card.CardType.CREDIT;
} else {
type = Card.CardType.DEBIT;
}
Card card = new MyCard(type, accountNumber, cardNumnber, amount);
model.add(card);
}
});
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JScrollPane(table));
frame.add(btn, BorderLayout.SOUTH);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public interface Card {
public enum CardType {
CREDIT, DEBIT;
}
public CardType getCardType();
public int getAccountNumber();
public int getCardNumber();
public double getAmount();
}
public class MyCard implements Card {
private CardType cardType;
private int accountNumber;
private int cardNumber;
private double amount;
public MyCard(CardType cardType, int accountNumber, int cardNumber, double amount) {
this.cardType = cardType;
this.accountNumber = accountNumber;
this.cardNumber = cardNumber;
this.amount = amount;
}
@Override
public CardType getCardType() {
return cardType;
}
public void setCardType(CardType cardType) {
this.cardType = cardType;
}
@Override
public int getAccountNumber() {
return accountNumber;
}
public void setAccountNumber(int accountNumber) {
this.accountNumber = accountNumber;
}
@Override
public int getCardNumber() {
return cardNumber;
}
public void setCardNumber(int cardNumber) {
this.cardNumber = cardNumber;
}
@Override
public double getAmount() {
return amount;
}
public void setAmount(double amount) {
this.amount = amount;
}
}
public static class CardTableModel extends AbstractTableModel {
protected static String[] COLUMN_NAMES = {"Card type", "Account Number", "Card Number", "Amount", "Select"};
protected static Class[] COLUMN_CLASSES = {String.class, Integer.class, Integer.class, Double.class, Boolean.class};
private Set<Integer> selected;
private List<Card> cards;
public CardTableModel() {
cards = new ArrayList<>(25);
selected = new TreeSet<Integer>();
}
@Override
public int getRowCount() {
return cards.size();
}
@Override
public int getColumnCount() {
return COLUMN_NAMES.length;
}
@Override
public String getColumnName(int column) {
return COLUMN_NAMES[column];
}
@Override
public Class<?> getColumnClass(int columnIndex) {
return COLUMN_CLASSES[columnIndex];
}
@Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
return columnIndex == 4;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
Card card = cards.get(rowIndex);
switch (columnIndex) {
case 0:
return card.getCardType().toString();
case 1:
return card.getAccountNumber();
case 2:
return card.getCardNumber();
case 3:
return card.getAmount();
case 4:
return selected.contains(rowIndex);
}
return null;
}
@Override
public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
if (columnIndex != 4) {
return;
}
if (!(aValue instanceof Boolean)) {
return;
}
boolean isSelected = (Boolean) aValue;
if (isSelected) {
selected.add(rowIndex);
} else {
selected.remove(rowIndex);
}
fireTableCellUpdated(rowIndex, columnIndex);
}
public void add(Card card) {
int index = cards.size();
cards.add(card);
fireTableRowsInserted(index, index);
}
public Card cardAt(int rowIndex) {
return cards.get(rowIndex);
}
}
}