一些java英文考试题
1. The Choice questions: (40 points in total, 2 points for each sub-question)
选择题：(共40分，每小题2分)
(1) When you declare an interface using interface , the modifier that can only be used to modify that interface is ( ) .
当你用 interface 声明一个接口时，唯一可以用来修饰该接口的修饰符是（ ）。
A) private
B) protected
C) private protected
D) public
Answer: D) public
答案: D) public
Explanation: In Java, interfaces are implicitly public
if **
they are declared with the public modifier. Interfaces can only be declared public or package-private (default), but not private, protected, or private protected.
题解: 在Java中，接口默认是public的。如果接口是公开的，必须显式使用public修饰符。Java不允许接口使用private或protected修饰。
(2) JDK is ( ).
JDK是（ ）。 A) A new programming language B) A program development tool C) A browser
D) Written by Java and supported by Java Applet
Answer: B) A program development tool
答案: B) 一种程序开发工具
Explanation: JDK (Java Development Kit) is a software development environment used to develop Java applications. It includes tools like the Java
compiler
(javac), the Java Runtime Environment (JRE), and libraries for developing Java applications.
题解: JDK（Java开发工具包）是一个软件开发环境，用于开发Java应用程序，包含Java编译器、Java运行时环境（JRE）和用于开发Java应用的库。
(3) When Java is used to define a new class, the keyword used is ( ).
当Java用于定义一个新类时，使用的关键字是（ ）。 A) Class B) public C) struct D) class or struct
Answer: A) class
答案: A) class
Explanation: In Java, the keyword used to define a new class is class. The keyword struct is not used in Java, though it is used in C/C++ for a similar concept.
题解: 在Java中，定义类时使用的是关键字class。struct是C/C++中用来定义结构体的关键字，Java中没有struct。