java如何将BigDecimal与JFormattedTextField一起使用

Question

我有一个字段：

jFormattedTextFieldGrossWeight = new javax.swing.JFormattedTextField();
jFormattedTextFieldGrossWeight.setFormatterFactory(new javax.swing.text.DefaultFormatterFactory(new javax.swing.text.NumberFormatter(new java.text.DecimalFormat("#,##0.00"))));

我使用其setValue（）方法为其分配一个BigDecimal值，并允许用户使用此文本字段修改该值

然后在lostFocus方法中，在线：

jFormattedTextField.commitEdit();
BigDecimal gross = (BigDecimal)this.jFormattedTextFieldGrossWeight.getValue();

我得到以下例外情况：

java.lang.ClassCastException: java.lang.Long cannot be cast to java.math.BigDecimal

有什么问题吗？如何修改代码以消除此错误

Answer 1

我已经基于JFormattedTextField实现了数字字段

JRealNumberField和JLocalizedRealNumberField是BigDecimal的文本字段

它们还支持最小值和最大值

也许您会发现它们很有用（该库是开源的）：

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JRealNumberField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JDoubleField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JFloatField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JLocalizedRealNumberField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JLocalizedDoubleField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JLocalizedFloatField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JWholeNumberField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JByteField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JIntegerField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JLongField.html

http://softsmithy.sourceforge.net/lib/docs/api/org/softsmithy/lib/swing/JShortField.html

教程：

http://softsmithy.sourceforge.net/lib/docs/tutorial/swing/number/index.html

主页：

http://www.softsmithy.org

下载：

http://sourceforge.net/projects/softsmithy/files/softsmithy/

马文：

<dependency>  
    <groupid>org.softsmithy.lib</groupid>  
    <artifactid>lib-core</artifactid>  
    <version>0.1</version>  
</dependency>  

-普塞

Answer 2

您可以尝试以下方法：

JFormattedTextField ftf = new JFormattedTextField();
ftf.setFormatterFactory(new DefaultFormatterFactory(
                        new NumberFormatter(new DecimalFormat("#,##0.00"))));


// Input = 1245678.57
// After the format it will be:
// 1,245,678.57
// So, we need to get rid of the comma's:
String number = ftf.getText().replace(",","");
BigDecimal bd = new BigDecimal(number);