[英]Inserting a new row after adding a new column to jTable gives array out of bound exception
我使用以下代碼創建了一個JTable。 然后我添加兩個新列。 然后在使行計數為零之后,當我嘗試向表中添加新行時,我得到數組超出綁定的異常。 請幫忙。
//creating table structure
jTable2 = new javax.swing.JTable();
jTable2.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
},
new String [] {
"Distance (km)", "Current (A)", "Resistance (Ω)"
}
) {
Class[] types = new Class [] {
java.lang.Double.class, java.lang.Double.class, java.lang.Double.class
};
boolean[] canEdit = new boolean [] {
false, false, true
};
public Class getColumnClass(int columnIndex) {
return types [columnIndex];
}
public boolean isCellEditable(int rowIndex, int columnIndex) {
return canEdit [columnIndex];
}
});
//adding two new columns
DefaultTableModel dtm = (DefaultTableModel) jTable2.getModel();
dtm.addColumn("Voltage (V)");
dtm.addColumn("Power (W)");
dtm.setRowCount(0);
//adding new row
dtm.addRow(new Object[]{1,5,2,4,6});
//i get this errors
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 3
at power_distribution.View.DC_Concentrated_One$1.getColumnClass(DC_Concentrated_One.java:93)
at javax.swing.JTable.getColumnClass(JTable.java:2698)
at javax.swing.JTable.getCellRenderer(JTable.java:5687)
at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:2113)
at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:2016)
at javax.swing.plaf.basic.BasicTableUI.paint(BasicTableUI.java:1812)
at javax.swing.plaf.ComponentUI.update(ComponentUI.java:161)
at javax.swing.JComponent.paintComponent(JComponent.java:778)
at javax.swing.JComponent.paint(JComponent.java:1054)
at javax.swing.JComponent.paintChildren(JComponent.java:887)
at javax.swing.JComponent.paint(JComponent.java:1063)
at javax.swing.JViewport.paint(JViewport.java:731)
at javax.swing.JComponent.paintChildren(JComponent.java:887)
at javax.swing.JComponent.paint(JComponent.java:1063)
at javax.swing.JComponent.paintToOffscreen(JComponent.java:5219)
at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1529)
at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1452)
at javax.swing.RepaintManager.paint(RepaintManager.java:1249)
at javax.swing.JComponent._paintImmediately(JComponent.java:5167)
at javax.swing.JComponent.paintImmediately(JComponent.java:4978)
at javax.swing.RepaintManager$3.run(RepaintManager.java:808)
at javax.swing.RepaintManager$3.run(RepaintManager.java:796)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:796)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:769)
at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:718)
at javax.swing.RepaintManager.access$1100(RepaintManager.java:62)
at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1677)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
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.awt.EventQueue.dispatchEvent(EventQueue.java:703)
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)
您的問題是當您添加新列時,您需要擴展您的types
變量,因為它僅保存“default”列的值,並且當getColumnClass()
調用拋出ArrayIndexOutOfBoundsException
新列時。
編輯:
擴展模型的示例,只需覆蓋下一個addColumn()
方法:
@Override
public void addColumn(Object columnName) {
Class[] temp = new Class[types.length +1];
System.arraycopy(types, 0, temp, 0, types.length);
temp[types.length] = Double.class;
types = temp;
super.addColumn(columnName);
}
還要檢查@mKorbel評論。
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