最近我问到哪个是最好的Swing组件绑定到BigDecimal变量（具有一些特定的编辑属性）。 事实证明，没有一个标准的Swing组件完全适合我，也没有找到我发现的第三方Swing组件库。 所以我决定创建自己的Swing组件。 
 
 组件说明： 
 
 我想扩展JTextField或JFormattedTextField ，因此我的新组件可以很容易地绑定到BigDecimal变量。 
 
 该组件将具有可自定义的缩放和长度属性。 
 
 行为： 
 
 绘制组件时，它仅显示右侧刻度数字的小数点和空格。 
 
 当组件获得焦点时，插入符号应位于小数点左侧。 当用户键入数字（忽略任何其他字符）时，它们出现在插入符的左侧，只接受长度 - 数字的数字，当整数部分已满时，忽略任何其他数字类型。 每当用户键入小数点时，插入符号移动到小数点的右侧。 键入的以下数字显示在小数部分，只有小数位数被认为是小数部分已满的任何其他数字被忽略。 此外，当用户键入小数点左侧的数字时，应显示千位分隔符。 
 
 我还希望能够将该组件用作JTable中的单元编辑器 （无需对其进行两次编码）。 
 
 在组件上调用getValue（）方法应该生成表示刚刚输入的数字的BigDecimal。 
 
 
 我从来没有创建过自己的Swing组件; 我几乎没有使用标准的。 所以我很感激有关创建所描述组件的任何好的教程/信息/提示。 到目前为止， 这是我唯一得到的东西。 
 
 提前致谢。 

Recently I asked which was the best Swing component to bind to a BigDecimal variable (with some particular editing properties). It turns out that none of the standard Swing components suit me completely, nor did the third-party Swing component libraries I've found out there. So I’ve decided to create my own Swing component.
 
Component description:
 
I want to extend JTextField or JFormattedTextField, so my new component can be easily bound to a BigDecimal variable.
 
The component will have customizable scale and length properties.
 
Behavior:
 
When the component is drawn, it shows only the decimal point and space for scale digits to its right.
 
When the component receives focus the caret should be positioned left to the decimal point. As the user types numbers (any other character is ignored) they appear to the left of the caret, only length – scale numbers are accepted, any other number typed is ignored as the integer portion is full. Any time the user types the decimal point the caret moves to the right side of the decimal point. The following numbers typed are shown in the decimal part, only scale numbers are considered any other number typed is ignored as the decimal portion is full. Additionally, thousand separators should appear as the user types numbers left to the decimal point.
 
I also want to be able to use the component as a Cell Editor in a JTable (without having to code it twice).
 
Invoking a getValue() method on the component should yield the BigDecimal representing the number just entered.
 
 
I’ve never created my own Swing component; I’ve barely used the standard ones. So I would appreciate any good tutorial/info/tip on creating the component described. This is the only thing I've got so far.
 
Thanks in advance.

原文：https://stackoverflow.com/questions/2511270