Question

我需要得到两个值并且除以一个值并在Jtxtfield中显示结果我用这个代码

    {
    int num1,num2,num3,sum;
    num1=Integer.parseInt(PB_cash.getText());
    num2=Integer.parseInt(DC_cash.getText());
    num3=Integer.parseInt(BD_cash.getText());
    sum=num1+num2-num3;
    HB_cash.setText(" "+sum);
    }

我在没有数据库连接的情况下尝试了它并且运行良好但是与数据库连接会产生运行时错误

这是错误

Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: " 77000"
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.Withdrawal_Interface.jButton7ActionPerformed(Withdrawal_Interface.java:758)
at bankapplication.Withdrawal_Interface.access$400(Withdrawal_Interface.java:30)
at bankapplication.Withdrawal_Interface$5.actionPerformed(Withdrawal_Interface.java:502)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$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)

Plz帮助我解决这个问题感谢

Answer 1

查看收到的异常，您不能将字符串数值中的空格发送到： Integer.parseInt（）方法：

您的例外：

Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: " 77000"

使用String.trim（）方法删除制表符和空格：

{
    int num1,num2,num3,sum;
    num1=Integer.parseInt(PB_cash.getText().trim());
    num2=Integer.parseInt(DC_cash.getText().trim());
    num3=Integer.parseInt(BD_cash.getText().trim());
    sum=num1+num2-num3;
    HB_cash.setText(" " + String.valueOf(sum)); //why you want the space is beyond me :)
}

另一方面，看看你的JTextField名称，看起来实际上最终还是提供了现金。请考虑使用 float 或 double 数据类型而不是 int 。这样，您还可以提供带小数的货币值，例如：5.99。

如何获得两个jtextfield值的总和除以jtxtfield中的另一个jtxt值

1 个答案: