SCJP 1.6版考題 078

A developer is creating a class Book, that needs to access class Paper. 
The Paper class is deployed in a JAR named myLib.jar. 

Which three, taken independently, will allow the developer to use the Paper class while compiling the Book class?
 (Choose Three.)
  A. The JAR file is located at $JAVA_HOME/jre/classes/myLib.jar.
  B. The JAR file is located at $JAVA_HOME/jre/lib/ext/myLib.jar.
  C. The JAR file is located at /foo/myLib.jar and a classpath environment variable is set 
     that includes /foo/myLib.jar/Paper.class.
  D. The JAR file is located at /foo/myLib.jar and a classpath environment variable is set 
     that includes /foo/myLib.jar.
  E. The JAR file is located at /foo/myLib.jar and the Book class is compiled using 
     javac –cp /foo/myLib.jar/Paper Book.java
  F. The JAR file is located at /foo/myLib.jar and the Book class is compiled using 
     javac -d /foo/myLib.jar Book.java
  G. The JAR file is located at foo/myLib.jar and the Book class is compiled using 
     javac –classpath /foo/myLib.jar Book.java

解答

---

Ans: B D G

解說:

一個程式發展者正在建立一個類別Book，這個類別必須存取類別Paper，類別Paper被佈署在一個名為myLib.jar的JAR檔案，
下列那三個可以分別地被這個發展者用來使用類別Paper，在編譯類別Book時
$JAVA_HOME/jre/lib/ext是Java執行環境預設放置JAR檔的地方
若不是放在這個地方，就要配合classpath的設定或指定，如答案BDG