如何總結一個jtable的列

-2

我想總結我的jTable的列。我已經讀了很多其他論壇條目，但它doesn't適合我的問題，或者它符合但後來occures一個新的問題...... 我的代碼如下：如何總結一個jtable的列

private void berechnenbuttonActionPerformed(java.awt.event.ActionEvent evt) {             

    int prow=0; 

    while(prow<=ptable.getRowCount()){ 
     double d = Double.parseDouble(ptable.getValueAt(prow, 1)+""); 
     int Amount = (int) d; 
     prow++; 
    } 
}

這是錯誤：

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 1 >= 1 
at java.util.Vector.elementAt(Vector.java:427) 
at javax.swing.table.DefaultTableModel.getValueAt(DefaultTableModel.java:632) 
at javax.swing.JTable.getValueAt(JTable.java:2652) 
at gedanke.Leckageberechnung_2.berechnenbuttonActionPerformed(Leckageberechnung_2.java:491) 
at gedanke.Leckageberechnung_2.access$800(Leckageberechnung_2.java:15) 
at gedanke.Leckageberechnung_2$11.actionPerformed(Leckageberechnung_2.java:175) 
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995) 
at javax.swing.AbstractButton$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:3260) 
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)

而且我也試過這一個：

phoehegesamt+= (Integer) ptable.getValueAt(prow, 1);

這一個：

phoehegesamt+=((integer) ptable.getValueAt(prow,1)).intvalue();

但兩端此錯誤：

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: java.lang.Double cannot be cast to java.lang.Integer 
at gedanke.Leckageberechnung_2.berechnenbuttonActionPerformed(Leckageberechnung_2.java:491) 
at gedanke.Leckageberechnung_2.access$800(Leckageberechnung_2.java:15) 
at gedanke.Leckageberechnung_2$11.actionPerformed(Leckageberechnung_2.java:175) 
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995) 
at javax.swing.AbstractButton$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:3260) 
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)

我明白任何幫助！ :) Steffen

來源

2015-02-11 Weissheit

指數是從0到'ptable.getRowCount（） - 1'，所以你需要使用'而（船頭 alex2410 2015-02-11 08:24:41

:)謝謝制定出！ – Weissheit 2015-02-11 08:49:24

爲了總結表的值，列必須是增量。你增加了行.. 希望這會有所幫助。

 double sum = 0; 
     int prow=1; 

     DefaultTableModel t = (DefaultTableModel) ptable.getModel(); 
     for (int i = 0; i < t.getRowCount(); i++) { 
      sum = sum + Double.parseDouble(t.getValueAt(prow, i).toString()); 

     }

來源

2015-03-01 06:29:06 Gihan

如何總結一個jtable的列

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