如何获得和在JTable中colmn

问题描述：

我试图建立自己的应用程序，我需要让我的jtable第5列值的总和，我用这个代码：如何获得和在JTable中colmn

public int getsum(){ 

    int sum = 0; 
    for (int i=0; i<jTable2.getRowCount(); i++) 
    { 
     sum = sum + Integer.parseInt(jTable2.getValueAt(i, 4).toString()); 
    } 
    txt_Total_amount.setText(Integer.toString(sum)); 
    return 0; 
}

然后，我有一个运行时错误： //

Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: " 2760" 
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) 
at java.lang.Integer.parseInt(Integer.java:569) 
at java.lang.Integer.parseInt(Integer.java:615) 
at bankapplication.Register_customer.getsum(Register_customer.java:71) 
at bankapplication.Register_customer.jButton5ActionPerformed(Register_customer.java:775) 
at bankapplication.Register_customer.access$800(Register_customer.java:24) 
at bankapplication.Register_customer$9.actionPerformed(Register_customer.java:488) 
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) 
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346) 
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.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289) 
at java.awt.Component.processMouseEvent(Component.java:6525) 
at 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.Window.dispatchEventImpl(Window.java:2739) 
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) 
at 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.pumpEventsForFilter(EventDispatchThread.java:109) 
at java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:184) 
at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:229) 
at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:227) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:227) 
at java.awt.Dialog.show(Dialog.java:1084) 
at java.awt.Component.show(Component.java:1654) 
at java.awt.Component.setVisible(Component.java:1606) 
at java.awt.Window.setVisible(Window.java:1014) 
at java.awt.Dialog.setVisible(Dialog.java:1005) 
at bankapplication.MainInterface.jButton6ActionPerformed(MainInterface.java:569) 
at bankapplication.MainInterface.access$700(MainInterface.java:25) 
at bankapplication.MainInterface$7.actionPerformed(MainInterface.java:203) 
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) 
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346) 
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:6525) 
at 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.Window.dispatchEventImpl(Window.java:2739) 
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) 
at 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) 
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

我试图改变：

public int getsum(){ 

    /////////////////////////////////////////////////// 
    int sum = 0; 
    for (int i=0; i<jTable2.getRowCount(); i++) 
    { 
     sum = sum + Integer.parseInt(jTable2.getValueAt(i, 3).toString()); 
    } 
    txt_Total_amount.setText(Integer.toString(sum)); 
    return 0; 
}

但将获得val的总和在我的第4栏中，我需要第5栏的总和。

您可能想重新格式化您的问题，删除那个巨大的栈跟踪墙。因此，这个问题不会排斥可能能够回答的人。 – Thomas

此外，请看一下异常消息：'java.lang.NumberFormatException：对于输入字符串：“2760” - 现在读取'Integer.parseInt（）'上的JavaDoc，并且您应该能够看到问题。（提示：空格） – Thomas

您可以向我们展示您的表模型的getValueAt（）方法吗？似乎有一个领先或尾随的空间。 – Maia

答

在错误的消息是一个很好的提示：

的问题是：" 2760"是不是可以被解析成整数的字符串候选（注意前导空格）

所以不是的

sum = sum + Integer.parseInt(jTable2.getValueAt(i, 4).toString());

做trim该字符串

sum += Integer.parseInt(jTable2.getValueAt(i, 4).toString().trim());

哦！非常感谢你帮助我，你的飞机更好地解决我的问题再次感谢很多.... :) –

欢迎您！ :) –

如何获得和在JTable中colmn

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