这是我自己编写的JAVA散列表的小程序，通过输入界面输入物品价格并通过输出流存到文件中，可以有助于您理解java的数据结构-this simple example was done by me,the GUI interface allows you to type into the data message and use stream to write into a file . in the viewing panel, you can check it. this example can help you understand FILE/IO and different data type