编写一个单文档应用程序Sy2，程序运行后，首先在视图窗口中输入文本（学号+学生姓名），然后通过键盘上的光标键控制该文本向左、向右、向上和向下4个方向移动。-Write a single document application Sy2, the program runs, first in the view window, enter the text (student ID+ student name), and then through the keyboard cursor keys to