Question

我有一个问题。我正在使用java applet设计一个界面，我想制作一个注册按钮，它接受用户名，密码，性别和年龄并将它们存储在一个数组中;从数组到 .txt 文件。该文件稍后将用于在用户尝试使用登录按钮登录时验证用户。

数组似乎存在问题，但我不知道出了什么问题。我在编程方面也很糟糕，所以也许对其他人来说这看起来很傻。不幸的是，我的声誉只有1，所以我不能发布界面的图片，但我认为你可以借助代码看到它。

我的代码太大了，无法发布到此处，所以我只会附加一个指向我的Netbeans文件夹的链接： CODE zip file

public class Interface extends javax.swing.JApplet { private int year=2015; private int year2=2015; private int month=1; private int month2=4; private int day=1; private int day2=28; private int n; private int age=0; private String gender= "M"; private String[][] logData = new String[4][n]; private void jSlider1StateChanged(javax.swing.event.ChangeEvent evt) { int v = jSlider1.getValue(); String vv = Integer.toString(v); jTextField2.setText(vv); } private void jSlider2StateChanged(javax.swing.event.ChangeEvent evt) { int v1 = jSlider2.getValue(); String vv1 = Integer.toString(v1); jTextField4.setText(vv1); } private void jToggleButton2StateChanged(javax.swing.event.ChangeEvent evt) { boolean slct = jToggleButton2.isSelected(); if (!slct) jTextField5.setText("ON"); else jTextField5.setText("OFF"); } private void jSlider3StateChanged(javax.swing.event.ChangeEvent evt) { int v2 = jSlider3.getValue(); String vv2 = Integer.toString(v2); jTextField7.setText(vv2); } private void jSlider4StateChanged(javax.swing.event.ChangeEvent evt) { int v3 = jSlider4.getValue(); String vv3 = Integer.toString(v3); jTextField9.setText(vv3); } private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) { JOptionPane.showMessageDialog(null, "The system will shut down"); } private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) { JOptionPane.showMessageDialog(null, "The system will restart"); } private void jComboBox1ItemStateChanged(java.awt.event.ItemEvent evt) { int k = jComboBox1.getSelectedIndex(); year=2015-k; jTextField3.setText(Integer.toString(year)); } private void jComboBox2ItemStateChanged(java.awt.event.ItemEvent evt) { int k = jComboBox2.getSelectedIndex(); month = k+1; jTextField8.setText(Integer.toString(month)); } private void jComboBox3ItemStateChanged(java.awt.event.ItemEvent evt) { int k = jComboBox3.getSelectedIndex(); day = k+1; switch (month){ case 2: if (year%4==0){ if (day>29) day=29; } if (year%4!=0){ if (day>28) day=28; } case 4: if (day>30) day=30; break; case 6: if (day>30) day=30; break; case 9: if (day>30) day=30; break; case 11: if (day>30) day=30; break; default: break; } jTextField10.setText(Integer.toString(day)); } private void jTextField3ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: } private void jComboBox5ItemStateChanged(java.awt.event.ItemEvent evt) { int k = jComboBox5.getSelectedIndex(); year2=2015-k; jTextField11.setText(Integer.toString(year2)); } private void jComboBox6ItemStateChanged(java.awt.event.ItemEvent evt) { int k = jComboBox6.getSelectedIndex(); month2 = k+1; jTextField12.setText(Integer.toString(month2)); } private void jComboBox7ItemStateChanged(java.awt.event.ItemEvent evt) { int k = jComboBox7.getSelectedIndex(); day2 = k+1; switch (month2){ case 2: if (year2%4==0){ if (day2>29) day2=29; } if (year2%4!=0){ if (day2>28) day2=28; } case 4: if (day2>30) day2=30; break; case 6: if (day2>30) day2=30; break; case 9: if (day2>30) day2=30; break; case 11: if (day2>30) day2=30; break; default: break; } jTextField13.setText(Integer.toString(day2)); } private void jTextField11ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: } private void jComboBox5ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: } private void jButton4MouseReleased(java.awt.event.MouseEvent evt) { n++; if(month2<month) age=year2-year-1; if((month2==month)&&(day2<day)) age=year2-year-1; if ((month2==month)&&(day2>=day)) age=year2-year; if (month2>month) age=year2-year; String ageStr=Integer.toString(age); if(jComboBox4.getSelectedIndex()==1) gender="F"; else gender="M"; if ((jTextField6.getText().equalsIgnoreCase(""))&&(jPasswordField2.getText().equalsIgnoreCase(""))) for (int i=0;i<n;i++){ logData[0][i]=jTextField6.getText(); logData[1][i]=jPasswordField2.getText(); logData[2][i]=ageStr; logData[3][i]=gender; } JOptionPane.showMessageDialog(null, "Registration successful"); //System.out.println(logData[0][0]); File log = new File("out.txt"); try{ if(log.exists()==false){ log.createNewFile(); } PrintWriter out = new PrintWriter(new FileWriter(log, true)); //out.println(logData[0][0]); out.close(); }catch(IOException e){ System.out.println("COULD NOT LOG!!"); } }

所以每当我尝试打印数组logData的值时，我都会遇到以下错误：

线程“AWT-EventQueue-1”中的异常java.lang.ArrayIndexOutOfBoundsException：0 在Interface.jButton4MouseReleased（Interface.java:1002）在Interface.access $ 700（Interface.java:23）在接口$ 8.mouseReleased（Interface.java:264）在java.awt.AWTEventMulticaster.mouseReleased（AWTEventMulticaster.java:290） at java.awt.Component.processMouseEvent（Component.java:6525）在javax.swing.JComponent.processMouseEvent（JComponent.java:3321） at java.awt.Component.processEvent（Component.java:6290） at java.awt.Container.processEvent（Container.java:2234） at java.awt.Component.dispatchEventImpl（Component.java:4881） at java.awt.Container.dispatchEventImpl（Container.java:2292） at java.awt.Component.dispatchEvent（Component.java:4703） at java.awt.LightweightDispatcher.retargetMouseEvent（Container.java:4898） at java.awt.LightweightDispatcher.processMouseEvent（Container.java:4533） at java.awt.LightweightDispatcher.dispatchEvent（Container.java:4462） at java.awt.Container.dispatchEventImpl（Container.java:2278） at java.awt.Component.dispatchEvent（Component.java:4703） at java.awt.EventQueue.dispatchEventImpl（EventQueue.java:746） at java.awt.EventQueue.access $ 400（EventQueue.java:97） at java.awt.EventQueue $ 3.run（EventQueue.java:697） at java.awt.EventQueue $ 3.run（EventQueue.java:691） at java.security.AccessController.doPrivileged（Native Method） at java.security.ProtectionDomain $ 1.doIntersectionPrivilege（ProtectionDomain.java:75） at java.security.ProtectionDomain $ 1.doIntersectionPrivilege（ProtectionDomain.java:86） at java.awt.EventQueue $ 4.run（EventQueue.java:719） at java.awt.EventQueue $ 4.run（EventQueue.java:717） at java.security.AccessController.doPrivileged（Native Method） at java.security.ProtectionDomain $ 1.doIntersectionPrivilege（ProtectionDomain.java:75）在java.awt.EventQueue.dispatchEvent（EventQueue.java:716） at java.awt.EventDispatchThread.pumpOneEventForFilters（EventDispatchThread.java:201） at java.awt.EventDispatchThread.pumpEventsForFilter（EventDispatchThread.java:116） at java.awt.EventDispatchThread.pumpEventsForHierarchy（EventDispatchThread.java:105） at java.awt.EventDispatchThread.pumpEvents（EventDispatchThread.java:101） at java.awt.EventDispatchThread.pumpEvents（EventDispatchThread.java:93）在java.awt.EventDispatchThread.run（EventDispatchThread.java:82）

Answer 1

由于您似乎总是处理相同数量的项目，为什么不使用Map而不是多维字符串数组？

Map vehicles = new HashMap();
vehicles.put("BMW", 5);
vehicles.put("Mercedes", 3);
vehicles.put("Audi", 4);
vehicles.put("Ford", 10);

Phonegap Build Documentation

或为你：

Map logData = new HashMap();
logData.put("jTextField6", jTextField6.getText());
logData.put("jPasswordField2", jPasswordField2.getText());
logData.put("age", ageStr);
logData.put("gender", gender);

然后你可以摆脱jButton4MouseReleased中那个尴尬的循环。如果你必须跟踪jButton4MouseReleased的调用，你可以使用这样的一系列尝试：

List attempts = new ArrayList();
Map logData = new HashMap();
logData.put("jTextField6", jTextField6.getText());
logData.put("jPasswordField2", jPasswordField2.getText());
logData.put("age", ageStr);
logData.put("gender", gender);
attempts.add(logData);

数组存储接口JAVA可能很容易解决

1 个答案: