说明：  一个用Java实现的打印程序示例，可以打印文本框里的文字，或整个显示框架，还可以打印预览，都是Java实现，运行命令java -jar print.jar。源文件都在包里。
( The printing procedure demonstration which realizes with Java, may print in the text frame the writing, or entire demonstration frame, but also may print looks at in advance, all is the Java realization, the movement orders java-jar print.jar. Source document all in Bao Li. )