Java 为什么它会抛出 IndexOutOfBoundsException？
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时间：2020-08-12 23:39:36 来源:igfitidea点击:
Why does it throw an IndexOutOfBoundsException?
提问by Johanna
I have a frame that has a table and an exit button. I want to add some data to my table, but this doesn't work correctly: when I open my frame at first, the data is OK, e.g., "Nima,Rahmani,...", then I click the exit button and open my frame again, the table now has "Nima,Rahmani,..." two times, and when I click exit button now, an IndexOutOfBoundsExceptionis thrown.
我有一个带有桌子和退出按钮的框架。我想向我的表中添加一些数据，但这不能正常工作：当我首先打开我的框架时，数据是可以的，例如，“Nima,Rahmani,...”，然后我单击退出按钮并再次打开我的框架，桌子现在有两次“Nima，Rahmani，...”，当我现在单击退出按钮时，IndexOutOfBoundsException会抛出一个。
My frame:
我的框架：
public class DeathList extends javax.swing.JFrame {
private Admin admin;
private ArrayList<Death> list;
DefaultTableModel model;
/** Creates new form DeathList */
public DeathList(Admin admin) {
initComponents();
this.admin = admin;
Manager.admin = admin;
try {
Manager.addToDeathListFromMySQL();
} catch (SQLException ex) {
Logger.getLogger(DeathList.class.getName()).log(Level.SEVERE, null, ex);
}
fillTable();
}
private void fillTable() {
String[] columNames = {"name", "family", "father's name", "date of birth",
"date of death", "date of confirmation",
"grave column", "grave row"};
List<Death> death = admin.getDeathList();
if (death.isEmpty()) {
JOptionPane.showMessageDialog(this, "Death list is empty! First, add a person.",
"Error", JOptionPane.ERROR_MESSAGE);
} else {
Object[][] data = new Object[death.size()][columNames.length];
for (int i = 0; i < data.length; i++) {
Death death1 = death.get(i);
data[i][0] = death1.getName();
data[i][1] = death1.getFamily();
data[i][2] = death1.getFatherName();
data[i][3] = death1.getDateOfBirth();
data[i][4] = death1.getDateOfDeath();
data[i][5] = death1.getDateOfConfirmation();
data[i][6] = death1.getGraveColumn();
data[i][7] = death1.getGraveRow();
}
model = new DefaultTableModel(data, columNames);
jTable1.setModel(model);
}
}
private void cBActionPerformed(java.awt.event.ActionEvent evt) {
List<String> d = new ArrayList<String>();
List<String> d1 = new ArrayList<String>();
List<String> d2 = new ArrayList<String>();
List<String> d3 = new ArrayList<String>();
for (int i = 0; i < jTable1.getRowCount(); i++) {
String name = (String) jTable1.getValueAt(i, 0);
String name1 = (String) jTable1.getValueAt(i, 1);
String name2 = (String) jTable1.getValueAt(i, 2);
String name3 = (String) jTable1.getValueAt(i, 3);
if (name != null && name1 != null && name2 != null && name3 != null) {
d.add(name);
d1.add(name1);
d2.add(name2);
d3.add(name3);
d.clear();
d1.clear();
d2.clear();
d3.clear();
Object[][] data1 = new Object[i][4];
for (int j = 0; j < data1.length; j++) {
String s = d.get(j);
String s1 = d1.get(j);
String s2 = d2.get(j);
String s3 = d3.get(j);
data1[j][0] = s;
data1[j][1] = s1;
data1[j][2] = s2;
data1[j][3] = s3;
}
model = new DefaultTableModel(data1, 4);
jTable1.setModel(model);
fillTable();
} else {
fillTable();
}
}
int r = JOptionPane.showConfirmDialog(this, "Are you sure?", "Message",
JOptionPane.YES_NO_CANCEL_OPTION);
if (r == JOptionPane.YES_OPTION) {
this.dispose();// TODO add your handling code here:
}
}}
stackTrace:
堆栈跟踪：
Exception in thread "AWT-EventQueue-0" java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.RangeCheck(ArrayList.java:547)
at java.util.ArrayList.get(ArrayList.java:322)
at AdminGUI.DeathList.cBActionPerformed(DeathList.java:192)
at AdminGUI.DeathList.accessd.add(name);
0(DeathList.java:28)
at AdminGUI.DeathList.actionPerformed(DeathList.java:122)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6038)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5803)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4410)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
at java.awt.Container.dispatchEventImpl(Container.java:2102)
at java.awt.Window.dispatchEventImpl(Window.java:2429)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
Exception in thread "AWT-EventQueue-0" java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.RangeCheck(ArrayList.java:547)
at java.util.ArrayList.get(ArrayList.java:322)
at AdminGUI.DeathList.cBActionPerformed(DeathList.java:192)
at AdminGUI.DeathList.accessd.clear();
0(DeathList.java:28)
at AdminGUI.DeathList.actionPerformed(DeathList.java:122)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at
javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6038)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5803)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4410)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
at java.awt.Container.dispatchEventImpl(Container.java:2102)
at java.awt.Window.dispatchEventImpl(Window.java:2429)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
回答by True Soft
The problem you have is because you add something in a list
您遇到的问题是因为您在列表中添加了一些内容
String s = d.get(j); // IndexOutOfBoundsException: Index: 0, Size: 0
you clear the list,
你清除清单，
##代码##then you try to access the element from that list:
然后您尝试访问该列表中的元素：
##代码##