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我想不管是什么原因它没有做它从另一个类的动作监听但是对于打开这个图形用户界面使这个类的一个对象，任何和所有帮助表示赞赏。我无法从其他类
package gui;
import java.awt.Color;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.table.DefaultTableModel;
import database.DBConnection;
import javax.swing.JButton;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.swing.JTextArea;
import javax.swing.JTable;
public class OrderExample {
static JFrame frame;
public static void main(String[] args){
try {
for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (Exception e) {
// If Nimbus is not available, you can set the GUI to another look and feel.
}
JFrame frame = new JFrame();
JTable table= new JTable();
table.setBounds(428, 445, 396, -328);
Object[] columns = {"Product Id", "Product Name", "Description", "Price"};
DefaultTableModel model = new DefaultTableModel();
model.setColumnIdentifiers(columns);
table.setModel(model);
table.setBackground(Color.white);
table.setForeground(Color.black);
Font font = new Font("", 1, 22);
table.setRowHeight(30);
JTextField prodId = new JTextField();
JTextField prodName = new JTextField();
JTextField prodPrice = new JTextField();
JButton btnAdd = new JButton("Add");
JButton btnDelete = new JButton("Delete");
JButton btnExit = new JButton("Exit");
prodId.setBounds(20, 56, 230, 38);
prodName.setBounds(20, 129, 230, 38);
prodPrice.setBounds(21, 201, 229, 39);
btnAdd.setBounds(20, 451, 100, 38);
btnDelete.setBounds(150, 451, 100, 38);
btnExit.setBounds(20, 511, 100, 39);
JScrollPane pane = new JScrollPane(table);
pane.setBounds(281, 32, 440, 518);
frame.getContentPane().setLayout(null);
frame.getContentPane().add(pane);
frame.getContentPane().add(prodId);
frame.getContentPane().add(prodName);
frame.getContentPane().add(prodPrice);
frame.getContentPane().add(btnAdd);
frame.getContentPane().add(btnDelete);
frame.getContentPane().add(btnExit);
JLabel lblAddId = new JLabel("Product ID");
lblAddId.setBounds(20, 32, 79, 14);
frame.getContentPane().add(lblAddId);
JLabel lblProduct = new JLabel("Product Name");
lblProduct.setBounds(20, 105, 100, 14);
frame.getContentPane().add(lblProduct);
JLabel lblProductPrice = new JLabel("Product Price");
lblProductPrice.setBounds(20, 178, 90, 14);
frame.getContentPane().add(lblProductPrice);
JButton btnListProducts = new JButton("List Products");
btnListProducts.setBounds(150, 511, 100, 39);
frame.getContentPane().add(btnListProducts);
JTextArea description = new JTextArea();
description.setBounds(20, 276, 230, 164);
frame.getContentPane().add(description);
JLabel lblDescription = new JLabel("Description");
lblDescription.setBounds(20, 251, 116, 14);
frame.getContentPane().add(lblDescription);
Object[] row = new Object[4];
btnAdd.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
row[0] = prodId.getText();
row[1] = prodName.getText();
row[2] = description.getText();
row[3] = prodPrice.getText();
model.addRow(row);
try{
Connection connection = DBConnection.getConnection();
PreparedStatement ps = connection.prepareStatement("insert into stock(sname, description, quantity , price) values(?,?,20,?);");
ps.setString(1, prodName.getText());
ps.setString(2, description.getText());
ps.setDouble(3, Double.parseDouble(prodPrice.getText()));
ps.executeUpdate();
}
catch(SQLException sqle){
sqle.printStackTrace();
}
}
});
btnDelete.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
int i = table.getSelectedRow();
if(i >= 0){
model.removeRow(i);
}
else{
System.out.print("Delete ");
}
}
});
table.addMouseListener(new MouseAdapter(){
@Override
public void mouseClicked(MouseEvent e) {
int i = table.getSelectedRow();
prodId.setText(model.getValueAt(i, 0). toString());
prodName.setText(model.getValueAt(i, 1).toString());
prodPrice.setText(model.getValueAt(i, 3).toString());
description.setText(model.getValueAt(i, 2).toString());
}
});
btnListProducts.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e){
int i = table.getSelectedRow();
try{
Connection connection = DBConnection.getConnection();
Statement statement = connection.createStatement();
ResultSet rs;
if(prodId.getText().equalsIgnoreCase(""))
rs = statement.executeQuery("select * from stock;");
else
rs = statement.executeQuery("select * from stock where stockID = " + prodId.getText() + ";");
while(rs.next()){
row[0] = rs.getInt("stockID");
row[1] = rs.getString("sname");
row[2] = rs.getString("description");
row[3] = rs.getDouble("price");
model.addRow(row);
}
} catch (SQLException e1) {
e1.printStackTrace();
}
}
});
btnExit.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e){
frame.dispose();
}
});
frame.setSize(771, 600);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
这是ActionListener的代码
btnStock.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
OrderExample window = new OrderExample();
}
});
我试图设置窗口可见，但它只是给我一个错误。
'但它只是给了我一个error' - 哪些错误？请发布完整的堆栈跟踪并突出显示发生错误的行。 – BackSlash
你得到了什么错误？ –
'OrderExample'的默认构造函数完全没有。你会如何期待调用它会显示一个窗口？ – Berger