您可以使用 NumberFormatter 构造它而且只会接受数字.

You can use a JFormattedTextField. Construct it using a NumberFormatter and it will only accept numbers.

JFormattedTextField具有许多可配置的选项，可让您决定如何处理错误的输入.我建议查看文档.

The JFormattedTextField has a bunch of configurable options that let you decide how bad input is handled. I recommend looking at the documentation.