我Table延伸JPanel，MyTableModel延伸AbstractTableModel。我想添加JFrame按钮ActionPerformed并从deleteRow()在所选行上调用MyTableModel。我该怎么办？
编辑：
当我在Palette的Frame中添加按钮时，我从按钮上的上下文菜单中添加
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
String text1 = titleTextField.getText();
String text2 = authorTextField.getText();
int text3 = Integer.parseInt(yearTextField.getText());
JTable table = table1.getTable();
MyTableModel model = (MyTableModel) table.getModel();
System.out.println(text1 + text2 +text3);
model.addRow(new Book(model.list.size(), text1, text2, text3));
}
我得到Null Pointer Exc on - ＆gt; JTable table = table1.getTable（）; - ＆GT;返回null
更新3：
大型机
package net.kxyz;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
import net.kxyz.Table.MyTableModel;
import xyz.libary.Book;
public class MainFrame extends javax.swing.JFrame {
public MainFrame() throws FileNotFoundException, IOException {
initComponents();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setVisible(true);
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
titleTextField = new javax.swing.JTextField();
authorTextField = new javax.swing.JTextField();
try {
table1 = new net.kxyz.Table();
} catch (java.io.FileNotFoundException e1) {
e1.printStackTrace();
} catch (java.io.IOException e2) {
e2.printStackTrace();
}
butt1 = new net.kxyz.Butt();
jButton1 = new javax.swing.JButton();
yearTextField = new javax.swing.JTextField();
deleteButton = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setText("Title:");
jLabel2.setText("Author:");
jLabel3.setText("Year:");
javax.swing.GroupLayout butt1Layout = new javax.swing.GroupLayout(butt1);
butt1.setLayout(butt1Layout);
butt1Layout.setHorizontalGroup(
butt1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 0, Short.MAX_VALUE)
);
butt1Layout.setVerticalGroup(
butt1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 150, Short.MAX_VALUE)
);
jButton1.setText("Addddd");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
deleteButton.setText("DELETE");
deleteButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
deleteButtonActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(table1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(107, 107, 107)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(0, 0, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel1, javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel2))
.addGap(1, 1, 1)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(authorTextField)
.addComponent(titleTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 90, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGroup(layout.createSequentialGroup()
.addGap(8, 8, 8)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(10, 10, 10)
.addComponent(jButton1))
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(yearTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 90, javax.swing.GroupLayout.PREFERRED_SIZE))))))
.addComponent(butt1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
.addGroup(layout.createSequentialGroup()
.addGap(18, 18, 18)
.addComponent(deleteButton)
.addGap(0, 0, Short.MAX_VALUE)))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(deleteButton)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(titleTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel2)
.addComponent(authorTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3)
.addComponent(yearTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton1)
.addGap(1, 1, 1)
.addComponent(butt1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addComponent(table1, javax.swing.GroupLayout.PREFERRED_SIZE, 329, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(0, 64, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
String text1 = titleTextField.getText();
String text2 = authorTextField.getText();
int text3 = Integer.parseInt(yearTextField.getText());
JTable table = table1.getTable();
MyTableModel model = (MyTableModel) table.getModel();
System.out.println(text1 + text2 + text3);
model.addRow(new Book(model.list.size(), text1, text2, text3));
}
private void deleteButtonActionPerformed(java.awt.event.ActionEvent evt) {
JTable table = table1.getTable();
MyTableModel model = (MyTableModel) table.getModel();
int row = table.getSelectedRow();
System.out.println("ROW: " + row);
model.removeRow(row);
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/*
* Set the Nimbus look and feel
*/
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/*
* If Nimbus (introduced in Java SE 6) is not available, stay with the
* default look and feel. For details see
* http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/*
* Create and display the form
*/
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
try {
new MainFrame().setVisible(true);
} catch (FileNotFoundException ex) {
Logger.getLogger(MainFrame.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(MainFrame.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
}
// Variables declaration - do not modify
private javax.swing.JTextField authorTextField;
private net.kxyz.Butt butt1;
private javax.swing.JButton deleteButton;
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private net.kxyz.Table table1;
private javax.swing.JTextField titleTextField;
private javax.swing.JTextField yearTextField;
// End of variables declaration
}
表格面板
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package net.kxyz;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import javax.swing.*;
import javax.swing.table.AbstractTableModel;
import xyz.libary.Book;
import xyz.libary.DataInterface;
import xyz.libary.MockDataInterface;
public class Table extends javax.swing.JPanel {
JTable table;
MyTableModel model;
public JTable getTable() {
return table;
}
MockDataInterfaceImpl dataInterface = new MockDataInterfaceImpl();
public Table() throws FileNotFoundException, IOException {
super(new GridLayout(1, 0));
final ArrayList<xyz.libary.Book> list = dataInterface.getAllBooks();
model = new MyTableModel(list);
jTable1 = new JTable(model);
jTable1.setLayout(null);
jTable1.setPreferredScrollableViewportSize(new Dimension(500, 70));
jTable1.setFillsViewportHeight(true);
JScrollPane scrollPane = new JScrollPane(jTable1);
add(scrollPane, BorderLayout.SOUTH);
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jScrollPane1 = new javax.swing.JScrollPane();
jTable1 = new javax.swing.JTable();
jTable1.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
{null, null, null, null},
{null, null, null, null},
{null, null, null, null},
{null, null, null, null}
},
new String [] {
"Title 1", "Title 2", "Title 3", "Title 4"
}
));
jScrollPane1.setViewportView(jTable1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 137, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(163, Short.MAX_VALUE))
);
}// </editor-fold>
// Variables declaration - do not modify
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTable jTable1;
// End of variables declaration
class MyTableModel extends AbstractTableModel {
private String[] columnNames = {"ID", "Title", "Author",
"Year", "State"};
ArrayList<Book> list = null;
MyTableModel(ArrayList<Book> list) {
this.list = list;
}
MyTableModel() {
}
public int getColumnCount() {
return columnNames.length;
}
public void removeRow(int row) {
list.remove(row);
fireTableDataChanged();
}
public int getRowCount() {
return list.size();
}
public String getColumnName(int col) {
return columnNames[col];
}
public Object getValueAt(int row, int col) {
Book object = list.get(row);
switch (col) {
case 0:
return object.getId();
case 1:
return object.getTitle();
case 2:
return object.getAuthor();
case 3:
return object.getYear();
case 4:
return object.isState();
default:
return "unknown";
}
}
@Override
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
}
boolean[] canEdit = new boolean[]{
false, true, true, true, true,};
@Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
return canEdit[columnIndex];
}
public void addRow(Book e) {
list.add(e);
}
@Override
public void setValueAt(Object value, int row, int col) {
switch (col) {
case 0:
// id not editable list.get(row).setId((int)value);
case 1:
list.get(row).setTitle((String) value);
break;
case 2:
list.get(row).setAuthor((String) value);
break;
case 3:
list.get(row).setYear((int) value);
break;
case 4:
list.get(row).setState(value);
System.out.println("VALUE: " + value);
break;
}
System.out.println("UPDATE ROW: " + row + " COL " + col);
dataInterface.updateBook(list.get(row));
fireTableCellUpdated(row, col);
}
}
}
书
package xyz.libary;
public class Book {
int id;
String title;
String author;
int year;
Boolean state;
public Book() {};
public Book(int id, String title, String author, int year) {
this.id = id ;
this.title = title;
this.author = author;
this.year = year;
this.state = true;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public Boolean isState() {
return state;
}
public void setState(Boolean state) {
this.state = state;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public int getYear() {
return year;
}
public void setYear(int year) {
this.year = year;
}
public void setState(Object value) {
this.state=(Boolean)(value);
}
}
但是，我不使用
package net.kxyz;
public class Butt extends javax.swing.JPanel {
/**
* Creates new form Butt
*/
public Butt() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jButton1 = new javax.swing.JButton();
jButton1.setText("jButton1");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 300, Short.MAX_VALUE)
);
}// </editor-fold>
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
// End of variables declaration
}
MockDataInterfaceImpl
package net.kxyz;
import java.util.ArrayList;
import xyz.libary.Book;
public class MockDataInterfaceImpl{
ArrayList<Book> book = new ArrayList<>();
public MockDataInterfaceImpl() {
book.add(new Book(book.size(), "TYTUL", "Autor", 1232));
book.add(new Book(book.size(), "Ogien", "Mickiewicz", 2012 ));
book.add(new Book(book.size(), "Woda", "Mickiewicz", 2012 ));
book.add(new Book(book.size(), "Ziemia", "Mickiewicz", 2012 ));
book.add(new Book(book.size(), "Powietrze", "Mickiewicz", 2012 ));
}
@Override
public ArrayList getAllBooks() {
return book;
}
@Override
public void updateBook(Book book) {
int index = book.getId() ;
this.book.get(index).setTitle(book.getTitle());
this.book.get(index).setAuthor(book.getAuthor());
this.book.get(index).setYear(book.getYear());
this.book.get(index).setState(book.isState());
System.out.println("Updated id = " +index);
}
@Override
public void deleteBook(Book book) {
int index = book.getId() ;
this.book.remove(index);
System.out.println("Remove id = " +index);
}
@Override
public void addBook(Book book) {
this.book.add(book);
}
}
答案 0 :(得分：1)
因为我在代码中的任何地方都没有看到actionPerformed方法，所以我假设您不知道如何在NetBeans中添加代码（因为某些部分是不可编辑的）。假设你不知道如何编写事件代码，这对我来说是愚蠢的;-)所以这里是Netbeans的基本步骤
Event -> Action -> actionPerformed 您应该会在底部附近的源代码中看到这样的内容
private void jButton1ActionPerformed(java.awt.event.ActionEvent e) {
}
在该方法中输入您的代码以删除行
您的JTable和TableModel看起来与按钮的类不同。那么你需要做的是在Table类中为表提供一个getter。完成后，你可以做这样的事情
private void jButton1ActionPerformed(java.awt.event.ActionEvent e) {
JTable table = table1.getTable();
MyTableModel model = (MyTableModel)table.getModel();
model.removeRow(...);
}
<强>更新
使用更短的代码自己测试。它工作正常。不是ClassCastException
Table.java
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
public class Table extends JPanel {
JTable table;
public Table() {
Object[][] data = {
{"Hello", "Hello", "Hello", "Hello", "Hello"},
{"Hello", "Hello", "Hello", "Hello", "Hello"},
{"Hello", "Hello", "Hello", "Hello", "Hello"},
{"Hello", "Hello", "Hello", "Hello", "Hello"}};
table = new JTable(new MyTableModel(data));
add(new JScrollPane(table));
}
public JTable getTable() {
return table;
}
class MyTableModel extends AbstractTableModel {
private String[] columnNames = {"ID", "Title", "Author",
"Year", "State"};
Object[][] list;
public MyTableModel(Object[][] list) {
this.list = list;
}
@Override
public int getRowCount() {
return list.length;
}
@Override
public int getColumnCount() {
return columnNames.length;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
return list[rowIndex][columnIndex];
}
}
}
TestTable.java
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import practice.Table.MyTableModel;
public class TestTable extends JFrame {
private Table table1;
private JButton button;
public TestTable() {
table1 = new Table();
button = new JButton("Get Value at 0, 0");
button.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
JTable table = table1.getTable();
MyTableModel model = (MyTableModel)table.getModel();
System.out.println(model.getValueAt(0, 0));
}
});
add(table1);
add(button, BorderLayout.SOUTH);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable(){
@Override
public void run() {
new TestTable();
}
});
}
}
答案 1 :(得分：0)
假设你的意思是removeRow（int），那么 -
jbutton1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
table.deleteRow(row);
}
});