在一个窗体上的上面放置两个按钮“Open”和“Save”,在一个Jfr a me的窗体上放置一个文本区,点击“Open”按钮,弹出打开对话框，选择一个文件打开后，在文本区中显示 “Opening:新建文本文档.txt.”，若选择了“取消”，则在文本区中显示“Open command cancdlled by user.”,点击“Save”按钮,弹出保存对话框，选择“保存”后，在文本区中显示 “Saving:新建文本文档.txt”，若选择了“取消”，则在文本区中显示Save command cancdlled by user-in a window on the top two buttons placed "Open" and "Save". Jfr a me in a place of a Form text, click on the "Open" button, open the pop-up dialog, Select a file is opened, in the text area showed that the "Opening : New text document. txt. " If they choose the "Cancel" in the text area showed that the "Open cancdlled by user command." , Click on the "Save" button, the pop-up dialog preservation, select the "Save", in the text area showed that the "Saving : New text document. txt ", the option of a" Cancel " in the text area is shown Save command cancdlled by user