数组的下标超界将访问到未知的内存区域

A、对

B、错

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• 如果想要一个类不能被任何类继承的话，需要使用哪个关键字来修饰该类？（） 

  A、  abstract

  B、  new

  C、  static

  D、  final

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• A developer is creating a class Book that needs to access class Paper.The Paper class is deployed in a JARnamedmyLib.jar.Whichthree，taken independently，will allow the developer to use the Paper class while compiling the Book class？（）

  A

  The JAR fileis located at$JAVA_HOME/jre/classes/myLib.jar.

  B

  The JAR fileis located at$JAVA_HOME/jre/lib/ext/myLib.jar.

  C

  TheJ AR fileis located at/foo/myLib.jar and aclasspath environment variable is set that includes /foo/myLib.jar/Paper.class.

  D

  The JAR fileis 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-classpath/foo/myLib.jar Book.java.

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• 数组的长度可以通过以下哪个属性或方法得到？（）  

  A、size

  B、length

  C、getSize（）

  D、getLength（）

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• 下面哪些类型实现了Comparable接口（）

  A

  Integer

  B

  double

  C

  String

  D

  Object

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• public class Demo{   public static void main（String[] args）{   List al = new ArrayList（）；   al.add（“1”）；   al.add（“2”）；   al.add（“2”）；   al.add（“3”）；   System.out.println（al）；  }  }   上述程序执行后的输出是哪项？（） 

  A、 [1，2，3]

  B、 [1，2，2，3]

  C、 [1，2，3，3]

  D、 [2，1，3，2]

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