Microsoft Windows [Version 6.2.9200]
(c) 2007 Microsoft Corporation. All rights reserved.

C:\Users\tp>cd C:/practice

C:\practice>javac FirstJavaProgram.java
javac: file not found: FirstJavaProgram.java
Usage: javac <options> <source files>
use -help for a list of possible options

C:\practice>
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나는 정말로 자바를 공부한적이 없다구요라는 교재를 사용하구요, 책에서 나온대로 다 했는데 저렇네요.......

그리고 지금 메모장말고 이클립스 써도 되나요?