我正在构建一个产品数据库，当我使用更新数据库功能时，我的程序崩溃了。
问题是程序本身抛出的一个字符串。
我从数据库文本文件中检索数据，因为我使用的是 numberformat.getCurrencyInstance 并且它会抛出一个美元符号。所以我抛出了一个异常 String Price = updatePriceTextField.getText().substring(1); 这样它就会绕过文本字段开头的美元符号并将信息发送回 textfile 并保存。
现在它提出了我当前的问题，即:当我输入大于 999 的数字并且达到数千时，它会带上逗号:示例:$3000.00 现在是 $3,000.00 当我尝试将该信息发送回数据库时，它会抛出错误并崩溃。
现在我知道我可以简单地添加另一个子字符串来避免，并解决这样的问题，但是如果对象的价格可以说是:$300000000.00 程序会抛出 2逗号 $300,000,000.00 并且会再次崩溃。那么我应该抛出什么样的异常或命令来绕过这些逗号(除了子字符串)。
很抱歉这篇文章很长，但我尽力解释了这个问题。
import java.util.ArrayList;
/**
*
* @author 0103425014
*/
public class EditProduct extends javax.swing.JFrame {
ProductTextFile txtfile = new ProductTextFile();
ArrayList<Product> products = txtfile.getProducts();
/**
* Creates new form UpdateProduct
*/
public EditProduct() {
initComponents();
for (Product p : products)
updateComboBox.addItem(p.getCode() + " " + p.getDescription());
}
/**
* 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() {
updateComboBox = new javax.swing.JComboBox();
jLabel1 = new javax.swing.JLabel();
updateCodeTextField = new javax.swing.JTextField();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
updateDesTextField = new javax.swing.JTextField();
updatePriceTextField = new javax.swing.JTextField();
buttonUpdate = new javax.swing.JButton();
buttonExit = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
updateComboBox.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
updateComboBoxActionPerformed(evt);
}
});
jLabel1.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
jLabel1.setText("Select Product to edit:");
jLabel2.setText("Product Code:");
jLabel3.setText("Product Description:");
jLabel4.setText("Product Price:");
buttonUpdate.setText("UPDATE");
buttonUpdate.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
buttonUpdateActionPerformed(evt);
}
});
buttonExit.setText("EXIT");
buttonExit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
buttonExitActionPerformed(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()
.addGap(76, 76, 76)
.addComponent(buttonUpdate)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(buttonExit)
.addGap(104, 104, 104))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(30, 30, 30)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel3)
.addComponent(jLabel4)
.addComponent(jLabel2))
.addGap(39, 39, 39)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(updateCodeTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 160, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(updateDesTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 160, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(updatePriceTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 160, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGroup(layout.createSequentialGroup()
.addGap(55, 55, 55)
.addComponent(updateComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, 158, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(39, 39, 39)
.addComponent(jLabel1)))
.addGap(0, 126, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(24, 24, 24)
.addComponent(jLabel1)
.addGap(33, 33, 33)
.addComponent(updateComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(33, 33, 33)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(updateCodeTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(29, 29, 29)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3)
.addComponent(updateDesTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(34, 34, 34)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(updatePriceTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel4))
.addGap(60, 60, 60)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(buttonUpdate)
.addComponent(buttonExit))
.addContainerGap(73, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void buttonExitActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
System.exit(0);
}
private void buttonUpdateActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
Product p = new Product();
p.setCode(updateCodeTextField.getText());
p.setDescription(updateDesTextField.getText());
String price = updatePriceTextField.getText().substring(1);
p.setPrice(Double.parseDouble(price));
txtfile.updateProduct(p);
UpdatedConfirm confirmed = new UpdatedConfirm();
confirmed.setVisible(true);
this.setVisible(false);
// txtfile.updateProduct();
}
private void updateComboBoxActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
int si = updateComboBox.getSelectedIndex();
Product sp = products.get(si);
updateCodeTextField.setText(sp.getCode());
updateDesTextField.setText(sp.getDescription());
updatePriceTextField.setText(sp.getFormattedPrice());
}
/**
* @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(EditProduct.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(EditProduct.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(EditProduct.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(EditProduct.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() {
new EditProduct().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton buttonExit;
private javax.swing.JButton buttonUpdate;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JTextField updateCodeTextField;
private javax.swing.JComboBox updateComboBox;
private javax.swing.JTextField updateDesTextField;
private javax.swing.JTextField updatePriceTextField;
// End of variables declaration
}
最佳答案
改用JFormattedTextField，这样您只需使用getValue，它就会返回该字段的未格式化值。
参见How to Use Formatted Text Fields了解更多详情
关于java - 我应该使用 substring 来避免 java 数据库中的某个字符串还是有其他方法可以绕过它？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/26666827/