用java假设实现可变分区的实现，包括界面以及可变分区用户自行选择。-Assuming Achieved using java variable partitions, including the user interface, and choose a variable partition.

简单的计算器Java代码，实现了加减乘除等基本功能，简易计算器的图形界面-A simple calculator Java code that implements the basic functions such as addition and subtraction multiplication and division, simple graphical interface