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单选题
现有:  class Guy {String greet()    {return "hi";  }  }  class Cowboy extends Guy  (  String greet()    (  return "howdy  ¨;    )  )  class Surfer extends Guy  (String greet()    (return "dude! ";)) class Greetings  {  public static void main (String  []  args)    {  Guy  []  guys =  ( new Guy(), new Cowboy(), new Surfer()  );  for (Guy g:  guys) System.out.print (g.greet()};  }  }  结果为:()
A

 hi howdy dude!

B

运行时异常被抛出。

C

第7行出现一个错误,编译失败。

D

第8行出现一个错误,编译失败。


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更多 “单选题现有:  class Guy {String greet()    {return "hi";  }  }  class Cowboy extends Guy  (  String greet()    (  return "howdy  ¨;    )  )  class Surfer extends Guy  (String greet()    (return "dude! ";)) class Greetings  {  public static void main (String  []  args)    {  Guy  []  guys =  ( new Guy(), new Cowboy(), new Surfer()  );  for (Guy g:  guys) System.out.print (g.greet()};  }  }  结果为:()A  hi howdy dude!B 运行时异常被抛出。C 第7行出现一个错误,编译失败。D 第8行出现一个错误,编译失败。” 相关考题
考题 现有:  class Tree {  private static String tree = "tree ";  String getTree ()  {  return tree;  }       }  class Elm extends Tree {  private static String tree = "elm ";  public static void main (String  []  args)  {       new Elm() .go (new Tree())  ;      } }  void go (Tree t)  {  String  s =  t.getTree () +Elm.tree  +  tree  +   (new  Elm() .getTree ()) ;      System.out.println (s) ;}     结果为:()                 A、 elm elm elm elmB、 tree elm elm elmC、 tree elm elm treeD、 tree elm tree elm

考题 Which statements concerning the following code are true?()   class a {   public a() {}   public a(int i) { this(); }   }   class b extends a {   public boolean b(String msg) { return false; }   }   class c extends b  {  private c() { super(); }   public c(String msg) { this(); }   public c(int i) {}   }  A、The code will fail to compile.B、The constructor in a that takes an int as an argument will never be called as a result of constructing an  object of class b or c.C、Class c has three constructors.D、Objects of class b cannot be constructed.E、At most one of the constructors of each class is called as a result of constructing an object of class c.

考题 现有  class Parser extends Utils {  public static void main (String  []  args)  {  try  {  System.out.print (new Parser () .getlnt ("42"))       }  catch (Exception e) {  System.out.println ("Exc") ;  }      }  int getlnt (String arg)  throws Exception  {     return Integer.parselnt (arg) ;      }      }  class Utils {  int getlnt ()  {  return 42;  }     }  结果是什么?()      A、 42ExcB、 ExcC、 42D、编译失败

考题 class Guy { String greet() { return "hi "; } }  class Cowboy extends Guy { String greet() { return "howdy "; } }  class Wrangler extends Cowboy { String greet() { return "ouch! "; } }  class Greetings2 {  public static void main(String [] args) {  Guy g = new Wrangler();  Guy g2 = new Cowboy();  Wrangler w2 = new Wrangler();  System.out.print(g.greet()+g2.greet()+w2.greet());  }  }  结果是什么?() A、hi hi ouch!B、hi howdy ouch!C、ouch! howdy ouch!D、编译失败

考题 class Guy{String greet(){return “hi“}}   class Cowboy extends Guy {String greet(){return“howdy”}}   class Surfer extends Guy {String greet(){return“dudel”}}  class Greetings{   public static void main (string[]args){   Guy[] guy= {new Guy(),new Cowboy(),new Surfer()};   for(Guy 0: guys)   System.out.print(g.green());  }   }   结果为:  A、运行时异常被输出B、第7行出现一个错误,编译失败C、第8行出现一个错误,编译失败D、hi hi hiE、hi hawdy doude

考题 class Mineral {   static String shiny() { return "1"; }   }   class Granite extends Mineral {   public static void main(String [] args) {   String s = shiny() + getShiny();   s = s + super.shiny();   System.out.println(s);   }   static String getShiny() { return shiny(); }   }   结果为:()  A、3B、12C、111D、编译失败

考题 Assume that country is set for each class.  Given:  10. public class Money {  11. private String country, name;  12. public getCountry() { return country; }  13.}  and:  24. class Yen extends Money {  25. public String getCountry() { return super.country; }  26. }  27.  28. class Euro extends Money {  29. public String getCountry(String timeZone) {  30. return super.getCountry();  31. }  32. }  Which two are correct?()A、 Yen returns correct values.B、 Euro returns correct values.C、 An exception is thrown at runtime.D、 Yen and Euro both return correct values.E、 Compilation fails because of an error at line 25.F、 Compilation fails because of an error at line 30.

考题 public class X {  public X aMethod() { return this;}  }  public class Y extends X {  }  Which two methods can be added to the definition of class Y?()A、 public void aMethod() {}B、 private void aMethod() {}C、 public void aMethod(String s) {}D、 private Y aMethod() { return null; }E、 public X aMethod() { return new Y(); }

考题 11. class Animal { public String noise() { return “peep”; } }  12. class Dog extends Animal {  13. public String noise() { return “bark”; }  14. }  15. class Cat extends Animal {  16. public String noise() { return “meow”; }  17. }  .....  30. Animal animal = new Dog();  31. Cat cat = (Cat)animal;  32. System.out.printIn(cat.noise());  What is the result?() A、 peepB、 barkC、 meowD、 Compilation fails.E、 An exception is thrown at runtime.

考题 现有:  class Guy {String greet()    {return "hi";  }  }  class Cowboy extends Guy  (  String greet()    (  return "howdy  ¨;    )  )  class Surfer extends Guy  (String greet()    (return "dude! ";)) class Greetings  {  public static void main (String  []  args)    {  Guy  []  guys =  ( new Guy(), new Cowboy(), new Surfer()  );  for (Guy g:  guys) System.out.print (g.greet()};  }  }  结果为:() A、 hi howdy dude!B、运行时异常被抛出。C、第7行出现一个错误,编译失败。D、第8行出现一个错误,编译失败。

考题 现有:  1. abstract class Color  {  2.protected abstract  String getRGB();     3.  }     4.  5. public class Blue extends Color  {     6.    //insert code here      7.  }  和四个声明:  public String getRGB()  {  return "blue";  }      String getRGB()  {  return  "blue";  )  private  String getRGB()  {  return  "blue";  }      protected String getRGB()  {  return "blue";  )      分别插入到第6行,有几个可以通过编译?()    A、  0B、  1C、  2D、  3

考题 public class Plant {  private String name;  public Plant(String name) { this.name = name; }  public String getName() { return name; }  }  public class Tree extends Plant {  public void growFruit() { }  public void dropLeaves() { }  }  Which is true?() A、 The code will compile without changes.B、 The code will compile if public Tree() { Plant(); } is added to the Tree class.C、 The code will compile if public Plant() { Tree(); } is added to the Plant class.D、 The code will compile if public Plant() { this(”fern”); } is added to the Plant class.E、 The code will compile if public Plant() { Plant(”fern”); } is added to the Plant class.

考题 class Parser extends Utils {  public static void main(String [] args) {   System.out.print(new Parser().getInt("42"));  }  int getInt(String arg) {  return Integer.parseInt(arg);  }  }  class Utils {  int getInt(String arg) throws Exception { return 42; }  }  结果为:() A、42B、编译失败C、无输出结果D、运行时异常被抛出

考题 You work as the application developer at Hi-Tech.com. You create a new custom dictionary named MyDictionary. Choose the code segment which will ensure that MyDictionary is type safe?()A、 Class MyDictionary Implements Dictionary (Of String,String)B、 Class MyDictionary Inherits HashTableC、 Class MyDictionary Implements IDictionaryD、 Class MyDictionary End Class Dim t as New Dictionary (Of String, String) Dim dict As MyDIctionary= CType (t,MyDictionary)

考题 单选题11. class Animal { public String noise() { return “peep”; } }  12. class Dog extends Animal {  13. public String noise() { return “bark”; }  14. }  15. class Cat extends Animal {  16. public String noise() { return “meow”; }  17. }  .....  30. Animal animal = new Dog();  31. Cat cat = (Cat)animal;  32. System.out.printIn(cat.noise());  What is the result?()A  peepB  barkC  meowD  Compilation fails.E  An exception is thrown at runtime.

考题 单选题class Guy{String greet(){return “hi“}}   class Cowboy extends Guy {String greet(){return“howdy”}}   class Surfer extends Guy {String greet(){return“dudel”}}  class Greetings{   public static void main (string[]args){   Guy[] guy= {new Guy(),new Cowboy(),new Surfer()};   for(Guy 0: guys)   System.out.print(g.green());  }   }   结果为:A 运行时异常被输出B 第7行出现一个错误,编译失败C 第8行出现一个错误,编译失败D hi hi hiE hi hawdy doude

考题 单选题现有:  1. abstract class Color  {  2.protected abstract  String getRGB();     3.  }     4.  5. public class Blue extends Color  {     6.    //insert code here      7.  }  和四个声明:  public String getRGB()  {  return "blue";  }      String getRGB()  {  return  "blue";  )  private  String getRGB()  {  return  "blue";  }      protected String getRGB()  {  return "blue";  )      分别插入到第6行,有几个可以通过编译?()A   0B   1C   2D   3

考题 单选题现有:   class Parser extends Utils {   public static void main(String [] args) {     System.out.print(new Parser().getInt("42"));    }   int getInt(String arg) {  return Integer.parseInt(arg);  }    }   class Utils {     int getInt(String arg) throws Exception { return 42; }    }    结果为()A  42B  编译失败。C  无输出结果。D  运行时异常被抛出。

考题 单选题You work as the application developer at Hi-Tech.com. You create a new custom dictionary named MyDictionary. Choose the code segment which will ensure that MyDictionary is type safe?()A  Class MyDictionary Implements Dictionary (Of String,String)B  Class MyDictionary Inherits HashTableC  Class MyDictionary Implements IDictionaryD  Class MyDictionary End Class Dim t as New Dictionary (Of String, String) Dim dict As MyDIctionary= CType (t,MyDictionary)

考题 单选题class Parser extends Utils {  public static void main(String [] args) {   System.out.print(new Parser().getInt("42"));  }  int getInt(String arg) {  return Integer.parseInt(arg);  }  }  class Utils {  int getInt(String arg) throws Exception { return 42; }  }  结果为:()A 42B 编译失败C 无输出结果D 运行时异常被抛出

考题 单选题现有  class Parser extends Utils {  public static void main (String  []  args)  {  try  {  System.out.print (new Parser () .getlnt ("42"))       }  catch (Exception e) {  System.out.println ("Exc") ;  }      }  int getlnt (String arg)  throws Exception  {     return Integer.parselnt (arg) ;      }      }  class Utils {  int getlnt ()  {  return 42;  }     }  结果是什么?()A  42ExcB  ExcC  42D 编译失败

考题 多选题public class X {  public X aMethod() { return this;}  }  public class Y extends X {  }  Which two methods can be added to the definition of class Y?()Apublic void aMethod() {}Bprivate void aMethod() {}Cpublic void aMethod(String s) {}Dprivate Y aMethod() { return null; }Epublic X aMethod() { return new Y(); }

考题 单选题public class Plant {  private String name;  public Plant(String name) { this.name = name; }  public String getName() { return name; }  }  public class Tree extends Plant {  public void growFruit() { }  public void dropLeaves() { }  }  Which is true?()A  The code will compile without changes.B  The code will compile if public Tree() { Plant(); } is added to the Tree class.C  The code will compile if public Plant() { Tree(); } is added to the Plant class.D  The code will compile if public Plant() { this(”fern”); } is added to the Plant class.E  The code will compile if public Plant() { Plant(”fern”); } is added to the Plant class.

考题 单选题现有:  class Guy  {  String greet()  {  return "hi";  } } class Cowboy extends Guy  {  String greet()  {  return. "howdy";}}  class  Wrangler  extends  Cowboy  {  String  greet()  {  return  "orch!"; } }  class Greetings2  {  public  static void main (String  []  args)  {  Guy g=new Wrangler();  Guy g2=new Cowboy();  Wrangler w2=new Wrangler();  System. out .print (g.greet()+g2.greet()+w2 .greet());  }  }  结果是什么?()A  hi hi ouch!B  ouch!  howdy  ouch!C  hi howdy ouch!D 编译失败E 运行的咐候有异常抛出

考题 单选题class Guy { String greet() { return "hi "; } }  class Cowboy extends Guy { String greet() { return "howdy "; } }  class Wrangler extends Cowboy { String greet() { return "ouch! "; } }  class Greetings2 {  public static void main(String [] args) {  Guy g = new Wrangler();  Guy g2 = new Cowboy();  Wrangler w2 = new Wrangler();  System.out.print(g.greet()+g2.greet()+w2.greet());  }  }  结果是什么?()A hi hi ouch!B hi howdy ouch!C ouch! howdy ouch!D 编译失败

考题 单选题现有:  class Parser (类)extends(继承) Utils {   public static void main(String [] args) {   System.out.print(输出打印)(new Parser().getInt("42"));  }   int getInt(String arg) {   return Integer.parseInt(arg);    }   }   class Utils {   int getInt(String arg) throws Exception { return 42; }  }   结果为:()A  42B  编译失败。C  无输出结果。D  运行时异常被抛出。

考题 单选题class Mineral {   static String shiny() { return "1"; }   }   class Granite extends Mineral {   public static void main(String [] args) {   String s = shiny() + getShiny();   s = s + super.shiny();   System.out.println(s);   }   static String getShiny() { return shiny(); }   }   结果为:()A 3B 12C 111D 编译失败