java NumberFormat执行选项
所以你可以在下面看到我的取款/存款和我的onSubmit功能。你可以看到im使用Integer.parseInt()。。。但当我使用它时，它会给我NumberFormatException：
Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: "Amount of deposit/withdrawal:"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:492)
at java.lang.Integer.parseInt(Integer.java:527)
at LocalBank.actionPerformed(LocalBank.java:179)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6516)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3320)
at java.awt.Component.processEvent(Component.java:6281)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4872)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4698)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4698)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:708)
at java.awt.EventQueue$4.run(EventQueue.java:706)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
这是我使用的代码。。。看看actionPerformed里面的“撤回”支票。里面有一个onSubmit将字符串转换为intInteger.parseInt();
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.math.*;
import java.security.*;
import java.util.UUID;
public class LocalBank implements ActionListener {
public Map <String,String> infoUser = new HashMap<String, String>();
private JFrame frame;
private JPanel contentPane;
private JLabel label1;
private JLabel label2;
private JLabel label3;
private JTextField accNumber;
private JTextField withdraw;
private JTextField text3;
private JButton avgButton;
private JLabel average;
private JComboBox plantNames;
private JTextField firstname;
private JTextField lastname;
private JTextField beggining;
private JButton submit;
private JLabel accNumLabel;
private JLabel withdawLabel;
private JLabel firstnameLabel;
private JLabel lastnameLabel;
private JLabel begginingLabel;
public LocalBank() {
// TODO Auto-generated constructor stub
frame = new JFrame("Semiseter");
contentPane = new JPanel();
contentPane.setLayout(new BoxLayout(contentPane,BoxLayout.PAGE_AXIS));
contentPane.setBorder(BorderFactory.createEmptyBorder
(20, 20, 20, 20));
label1 = new JLabel("Enter An Integer");
label1.setAlignmentX(JLabel.LEFT_ALIGNMENT);
contentPane.add(label1);
String[] names = {"Deposit", "Withdrawal", "Check Balance","Add Account","Remove Account"};
plantNames = new JComboBox(names);
plantNames.setAlignmentX(JComboBox.LEFT_ALIGNMENT);
plantNames.setSelectedIndex(0);
plantNames.addActionListener(this);
contentPane.add(plantNames);
accNumLabel = new JLabel("Account Number");
contentPane.add(accNumLabel);
accNumber = new JTextField();
contentPane.add(accNumber);
withdawLabel = new JLabel("Amount of deposit/withdrawal:");
contentPane.add(withdawLabel);
withdraw = new JTextField("");
contentPane.add(withdraw);
firstnameLabel = new JLabel("First Name:");
contentPane.add(firstnameLabel);
firstname = new JTextField();
contentPane.add(firstname);
lastnameLabel = new JLabel("Last Name:");
contentPane.add(lastnameLabel);
lastname = new JTextField("");
contentPane.add(lastname);
begginingLabel = new JLabel("Beginning Balance:");
contentPane.add(begginingLabel);
beggining = new JTextField("");
contentPane.add(beggining);
submit = new JButton("Process Transaction");
submit.addActionListener(this);
submit.setActionCommand("Submit");
contentPane.add(submit);
frame.setContentPane(contentPane);
/* Size and then display the frame. */
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
private static void runGUI() {
JFrame.setDefaultLookAndFeelDecorated(true);
LocalBank greeting = new LocalBank();
}
public static void main(String[] args) {
/* Methods that create and show a GUI should be
run from an event-dispatching thread */
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
runGUI();
}
});
}
public void actionPerformed(ActionEvent event) {
// TODO Auto-generated method stub
//ArrayList<String> infoUser = new ArrayList<String>();
JComboBox comboBox = plantNames;
String plantName = (String)comboBox.getSelectedItem();
String eventString = event.getActionCommand();
if ("Deposit".equals(plantName)) {
accNumLabel.setVisible(true);
accNumber.setVisible(true);
withdawLabel.setVisible(true);
withdraw.setVisible(true);
firstnameLabel.setVisible(false);
firstname.setVisible(false);
lastnameLabel.setVisible(false);
lastname.setVisible(false);
begginingLabel.setVisible(false);
beggining.setVisible(false);
if(eventString.equals("Submit")) {
String balanceString = infoUser.get("Beggining");
int balance = Integer.parseInt(balanceString);
String withDrawString = withdawLabel.getText();
int deposit = Integer.parseInt(withDrawString);
int currentBalance = balance + deposit;
infoUser.put("Beggining", String.valueOf(currentBalance));
System.out.println("CURRENT BALANCE " + infoUser.get("Beggining"));
}
}
else if ("Withdrawal".equals(plantName)) {
accNumLabel.setVisible(true);
accNumber.setVisible(true);
withdawLabel.setVisible(true);
withdraw.setVisible(true);
firstnameLabel.setVisible(false);
firstname.setVisible(false);
lastnameLabel.setVisible(false);
lastname.setVisible(false);
begginingLabel.setVisible(false);
beggining.setVisible(false);
if(eventString.equals("Submit")) {
String balanceString = infoUser.get("Beggining");
int balance = Integer.parseInt(balanceString);
String withDrawString = withdawLabel.getText();
int withdraw = Integer.parseInt(withDrawString);
int currentBalance = balance - withdraw;
infoUser.put("Beggining", String.valueOf(currentBalance));
System.out.println("CURRENT BALANCE " + infoUser.get("Beggining"));
}
}
else if ("Check Balance".equals(plantName)) {
accNumLabel.setVisible(true);
accNumber.setVisible(true);
firstnameLabel.setVisible(false);
firstname.setVisible(false);
lastnameLabel.setVisible(false);
lastname.setVisible(false);
begginingLabel.setVisible(false);
beggining.setVisible(false);
withdawLabel.setVisible(false);
withdraw.setVisible(false);
if(eventString.equals("Submit")){
System.out.println("*****ACCOUNT INFO ****");
System.out.println("FIRSTNAME : " + infoUser.get("Firstname"));
System.out.println("LASTNAME : " + infoUser.get("Lastname"));
System.out.println("Price : " + infoUser.get("Beggining"));
System.out.println("ACCOUNT NUMBER : " + infoUser.get("AccNum"));
}
}
else if ("Add Account".equals(plantName)) {
accNumLabel.setVisible(false);
accNumber.setVisible(false);
withdawLabel.setVisible(false);
withdraw.setVisible(false);
firstnameLabel.setVisible(true);
firstname.setVisible(true);
lastnameLabel.setVisible(true);
lastname.setVisible(true);
begginingLabel.setVisible(true);
beggining.setVisible(true);
if(eventString.equals("Submit")){
String AccNumberGenerated = UUID.randomUUID().toString();
System.out.println("Account Added with FirstName : " + firstname.getText()+ " Lastname " + lastname.getText() + " And Beggining Balance : " + beggining.getText() + "And Finally Account Number of " + AccNumberGenerated);
infoUser.put("Firstname" , firstname.getText());
infoUser.put("Lastname" , lastname.getText());
infoUser.put("Beggining" , beggining.getText());
infoUser.put("AccNum" , AccNumberGenerated);
}
}
else if ("Remove Account".equals(plantName)) {
accNumLabel.setVisible(true);
accNumber.setVisible(true);
withdawLabel.setVisible(false);
withdraw.setVisible(false);
firstnameLabel.setVisible(false);
firstname.setVisible(false);
lastnameLabel.setVisible(false);
lastname.setVisible(false);
begginingLabel.setVisible(false);
beggining.setVisible(false);
if(eventString.equals("Submit")){
System.out.println("ACCOUNT DELETED");
frame.setVisible(false);
frame.dispose();
System.exit(0);
}
}
else{
accNumLabel.setVisible(false);
accNumber.setVisible(false);
withdawLabel.setVisible(false);
withdraw.setVisible(false);
firstnameLabel.setVisible(false);
firstname.setVisible(false);
lastnameLabel.setVisible(false);
lastname.setVisible(false);
begginingLabel.setVisible(false);
beggining.setVisible(false);
}
}
}
# 1 楼答案
问题是，您试图解析标签的文本，而不是字段的文本
这里：
将
withdawLabel的文本存储在withDrawString中，即"Amount of deposit/withdrawal:"，它不是一个数字，因此不能被解析为int。相反，你必须做到：作为旁注，
withdawLabel的拼写是错误的