class A {  }  class Alpha {  private A myA = new A（）；  void dolt（ A a ） {  a = null；  }  void tryIt（） {  dolt（ myA ）；  }  }  Which two statements are correct？（）  

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  A .  Compilation of both classes will fail. B .  Compilation of both classes will succeed. C .  Compilation of class a will fail. Compilation of class b will succeed. D .  Compilation of class a will fail. Compilation of class a will succeed.

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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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• 现有如下包结构：  com -- x  -- Alpha.class    -- y  -- Beta.class  -- Gamma.class  和类：  class Test { Alpha a； Beta b； Gamma c； }  哪三个必须加入到类 Test 中，以使其通过编译？（）

  A . package y； B . package com； C . import com.x.*； D . import com.x.y.*

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• public class Alpha{  private static Character（） ids；  public static void main（ String[] args）{  ids = new Character[args.length]；  for （int i=0； iids[i] = new Character（ args[i] ）；  System.out.print（ ids[i] ）；  }  }  }   What is correct？（）    

  A .  Compilation fails. B .  The code runs with no output. C .  An exception is thrown at runtime. D .  The code runs， outputing a concatenated list of the arguments passed to the program.

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• public class Alpha1 {  public static void main（ String[] args ） {  boolean flag； int i=0；  do {  flag = false；  System.out.println（ i++ ）；  flag = i < 10；  continue；  } while （ （flag）？ true：false ）；  }  }  What is the result？（）  

  A .  000000000 B .  0123456789 C .  Compilation fails. D .  The code runs with no output. E .  The code enters an infinite loop. F .  An exception is thrown at runtime.

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• The difference between a class A and a class B EPIRB is that the class A EPIRB（）.

  A . operates on both military and civilian aircraft distress frequencies B . transmits both an alerting signal and a homing signal C . must be the float free type and automatically activated D . operates with a greater output of signal power

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• 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 Bookclass？（）

  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 - classpath /foo/myLib.jar Book.java

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• 现有包结构：  com -- x  -- Alpha.class    -- y  -- Beta.class  -- Gamma.class  和类：  //insert code here  import com.*；  import com.x.y.*；  class Test { Alpha a； Beta b； Gamma c； }  哪两行分别插入后可允许代码编译？（） 

  A . package com.； B . import com.x； C . package com.x； D . import com.x.Alpha；

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• class A {  A（） { }  }  class B extends A {  }  Which two statements are true？（）

  A .  Class B’s constructor is public. B .  Class B’s constructor has no arguments. C .  Class B’s constructor includes a call to this（）. D .  Class B’s constructor includes a call to super（）.

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• 现有：  interface  I  {  void go（）；  }      abstract class A implements I { }      class C extends A  {     void go（）{ }     }  结果是什么？（）   

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• 10. class Foo {  11. static void alpha（） { /* more code here */ }  12. void beta（） { /* more code here */ }  13. }  Which two are true？（）

  A .  Foo.beta（） is a valid invocation of beta（）. B .  Foo.alpha（） is a valid invocation of alpha（）. C .  Method beta（） can directly call method alpha（）. D .  Method alpha（） can directly call method beta（）.

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• class Base {  Base（） { System.out.print（“Base”）； }  }  public class Alpha extends Base {  public static void main（ String[] args ） {  new Alpha（）；  new Base（）；  }  }  What is the result？（）  

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• 现有如F包结构：      com     一一X          一一Alpha.class                   一一y      I         一一Beta.class           l-- Gamma.class    和类：      class Test  {  Alpha a；  Beta b； Gamma c；  }  哪三个必须加入到类Test中，以使其通过编译？（） 

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• 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?（）

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• class A {  protected int method1（int a， int b） { return 0； }  }  Which two are valid in a class that extends class A？（） 

  A .  public int method1（int a， int b） { return 0； } B .  private int method1（int a， int b） { return 0； } C .  private int method1（int a， long b） { return 0； } D .  public short method1（int a， int b） { return 0： } E .  static protected int method1（int a， int b） { return 0； }

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• class A{}class B{}class C extends A B{}//同时继承了两个父类

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• At a standard lumber mill, the first grading choice for hardwood is the ____.A. Factory Class B. Veneer Class C. Sawlog Class

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• 若类A和类B的定义如下；class A{ int i，j；public： int geti（) {return i； }}；clasS B：public A{ i

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• 对于类定义：class A{public:virtual void func1（){}void func2（){}};class B:public A{public:

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• 若类A和类B的定义如下：class A{int i，public：void get（)；//．．．}；class B：A//默认为私有派生{int

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• 某 Java源文件代码如下: public class A { int a; } class B { int b; } class C { public static void main（）

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• 13、下面程序的输出结果是（）。 class J_Class { static int m_data=0; } class J_Test { public static void main（String []args) { J_Class a=new J_Class（); J_Class b=new J_Class（); a.m_data=1; b.m_data=2; System.out.println（a.m_data); } } A． 0 B．1 C． 2 D． 程序无法通过编译。

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• 10、LoRa网络包含基础LoRaWAN（称之为Class A）和可选功能（Class B，Class C）。

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