OCJP认证-3期（PX017） 面向对象程序设计-Package及JAR.doc

真题分析

面向对象程序设计

Package 及 JAR

(1)Given the following Java code:

package test;

class Target {

public String name = "hello";

}

What can directly access and change the value of the variable name?

� 本题考修饰字的存取范围

� Target 为无存取修饰字, 所以本类别的能见度仅在相同的 package 中

� 该变量 name 的存取修饰字为 public, 所以范围最多只能与所属类别相同.

� 因此本题相当简单

(2)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/ext/myLib.jar

C. The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that