class Super {  public int getLenght( ) { return 4; }  }  public class Sub extends Super {  public long getLenght( ) { return 5; }  public static void main(String[] args) {  Super sooper = new Super( );  Sub sub = new Sub( );  System.out.println(  sooper.

题目

class Super {  public int getLenght( ) { return 4; }  }  public class Sub extends Super {  public long getLenght( ) { return 5; }  public static void main(String[] args) {  Super sooper = new Super( );  Sub sub = new Sub( );  System.out.println(  sooper.getLenght( ) + “,” + sub.getLenght( ) );  }  } What is the output?()

  • A、 Just after line 13.
  • B、 Just after line 14.
  • C、 Just after line 15.
  • D、 Just after line 16 (that is, as the method returns).

相似考题
更多“class Super {  p”相关问题
  • 第1题:

    下面程序输出的结果为 #include"iostream.h” class A { public: A(){cout<<"CLASSA"<<endl;} ~A() {} }; class B:public A { public: B(){cout<<"CLASS B"<<endl;} ~B(){} }; void main() { A*p; p=new B;

    A.CLASS A CLASS B CLASS B CLASS B

    B.CLASS A CLASS B CLASS A CLASS B

    C.CLASS A CLASS B CLASS B

    D.CLASS A CLASS B


    正确答案:C

  • 第2题:

    下列程序的输出结果是

    class Father{

    int m.n;

    Father(int a,int B)

    { m=a;

    n=b

    }

    void show ( ){

    System.out.println("m and n:"+m+" "+n);

    }

    }

    class Son extends Father{

    int p;

    Son (int a,int b,int C)

    { super(a,B) ;

    p=c;

    }

    void show(){supur.show( );

    System.out.println("p:"+p);

    }

    }

    class Test {

    public static void main (String args[ ])

    { Son s:new Son(6,7,8);

    s.show( );

    }

    }

    A.m and n:6 8 p:7

    B.m andn:6 7 p:8

    C.m and n:7 8 p:6

    D.m and n:8 7 p:6


    正确答案:B
    解析:如果你希望访问一个覆盖方法的超类版本,可以通过super来做到这一点,本题中show()的超类版本在子类版本内被调用。

  • 第3题:

    The lower-level classes(known as subclasses or derived classes) ( )state andbehavior from the higher-level class(known as a super class or base class).

    A.request
    B.inherit
    C.invoke
    D.accept

    答案:B
    解析:
    低层的类(也称子类或派生类)从高层类(也称为超类或基类)中继承了状态和行为。

  • 第4题:

    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().

    正确答案:B,D

  • 第5题:

    class super {  public int getLength()  {return 4;}  }  public class Sub extends Super {  public long getLength() {return 5;}  public static void main (String[]args)  {  super sooper = new Super ();  Sub sub = new Sub();  System.out.printIn(  sooper.getLength()+ “,” + sub.getLength()   };  }  What is the output?()  

    • A、 4, 4
    • B、 4, 5
    • C、 5, 4
    • D、 5, 5
    • E、 The code will not compile.

    正确答案:E

  • 第6题:

    1. class super {  2. public float getNum() {return 3.0f;}  3. }  4.    5. public class Sub extends Super { 6.   7. }   Which method, placed at line 6, will cause a compiler error?()  

    • A、  Public float getNum()   {return 4.0f; }
    • B、  Public void getNum ()  { }
    • C、  Public void getNum (double d)   { }
    • D、  Public double getNum (float d) {retrun 4.0f; }

    正确答案:B

  • 第7题:

    多选题
    In the Java API documentation which sections are included in a class document?()
    A

    The description of the class and its purpose

    B

    A list of methods in its super class

    C

    A list of member variable

    D

    The class hierarchy


    正确答案: D,A
    解析: 类文档的内容主要是:类层次、类及用途描述、成员变量列表、构造方法列表、成员方法列表、从类层次上继承的方法列表、成员变量的详细说明、构造方法详细说明、成员方法详细说明。

  • 第8题:

    单选题
    class Super {  public Integer getLenght() { return new Integer(4); } }  public class Sub extends Super {  public Long GetLenght() { return new Long(5); }  public static void main(String[] args) { Super sooper = new Super();  Sub sub = new Sub();  System.out.println(  sooper.getLenght().toString() + “,” +  sub.getLenght().toString() ); } }  What is the output?()
    A

     4,4

    B

     4,5

    C

     5,4

    D

     5,5

    E

     Compilation fails.


    正确答案: B
    解析: 暂无解析

  • 第9题:

    多选题
    1. class BigDog extends Dog {  2. // insert code here  3. }  分别插入到第 2 行,哪二项可以编译?()
    A

    BigDog() { super(); this(); }

    B

    BigDog() {  String name = Fido;  super();  }

    C

    BigDog() {  super();  String name = Fido;  }

    D

    private BigDog() {  super();}


    正确答案: D,A
    解析: 暂无解析

  • 第10题:

    单选题
    1. class super {  2. public float getNum() {return 3.0f;}  3. }  4.    5. public class Sub extends Super { 6.   7. }   Which method, placed at line 6, will cause a compiler error?()
    A

      Public float getNum()   {return 4.0f; }

    B

      Public void getNum ()  { }

    C

      Public void getNum (double d)   { }

    D

      Public double getNum (float d) {retrun 4.0f; }


    正确答案: D
    解析: 暂无解析

  • 第11题:

    单选题
    class super {   public float getNum() {return 3.0f;}   }   public class Sub extends Super {   }   Which method, placed at line 6, will cause a compiler error?()
    A

     Public float getNum() {return 4.0f; }

    B

     Public void getNum (){}

    C

     Public void getNum (double d){}

    D

     Public double getNum (float d) {retrun 4.0f; }


    正确答案: A
    解析: 暂无解析

  • 第12题:

    多选题
    1. class Super {  2. private int a;  3. protected Super(int a) { this.a = a; }  4. }  .....  11. class Sub extends Super {  12. public Sub(int a) { super(a); }  13. public Sub() { this.a= 5; }  14. }  Which two, independently, will allow Sub to compile?()
    A

    Change line 2 to: public int a;

    B

    Change line 2 to: protected int a;

    C

    Change line 13 to: public Sub() { this(5); }

    D

    Change line 13 to: public Sub() { super(5); }

    E

    Change line 13 to: public Sub() { super(a); }


    正确答案: E,D
    解析: 暂无解析

  • 第13题:

    下面程序输出的结果为( )。 #inClUde”iostream.h” Class A {public: A(){cout<<“CLASS A”<<endl;} ~A()<)}; class B:public A {public: B(){cout<<”CLASSB”<<endl;} ~B(){}}; void main() {A*p; p=new B; B *q; q=new B;}

    A.CLASS A CLASS B

    B.CLASS A CLASS B CLASS B

    C.CLASS A ClASS B

    D.CLASS A CLASS B CLASS A CLASS B CLASS B CLASS B


    正确答案:C
    解析: 本题考查类的继承、类的实例化和构造函数、析构函数的调用方式和何时调用。每实例化一个类就要调用其构造函数,结束运行该实例后调用析构函数。

  • 第14题:

    The lower-level classes (known as subclasses or derived classes) ( ) state and behavior from the higher-level class (known as a super class or base class).

    A.request B.inherit C.invoke D.accept


    正确答案:B

  • 第15题:

    public class Person {  private String name, comment;  private int age;  public Person(String n, int a, String c) {  name = n; age = a; comment = c;  }  public boolean equals(Object o) {  if(! (o instanceof Person)) return false;  Person p = (Person)o;  return age == p.age && name.equals(p.name);  }  }  What is the appropriate definition of the hashCode method in class Person?() 

    • A、 return super.hashCode();
    • B、 return name.hashCode() + age * 7;
    • C、 return name.hashCode() + comment.hashCode() /2;
    • D、 return name.hashCode() + comment.hashCode() / 2 - age * 3;

    正确答案:B

  • 第16题:

    class super {   public float getNum() {return 3.0f;}   }   public class Sub extends Super {   }   Which method, placed at line 6, will cause a compiler error?()

    • A、 Public float getNum() {return 4.0f; }
    • B、 Public void getNum (){}
    • C、 Public void getNum (double d){}
    • D、 Public double getNum (float d) {retrun 4.0f; }

    正确答案:B

  • 第17题:

    class Super {  public int i = 0;  public Super(String text) {  i = 1; }  }  public class Sub extends Super {  public Sub(String text) {  i = 2;  }   public static void main(String args[]) {  Sub sub = new Sub(“Hello”);  System.out.println(sub.i);  }  }  What is the result?()  

    • A、 0
    • B、 1
    • C、 2
    • D、 Compilation fails.

    正确答案:C

  • 第18题:

    In the Java API documentation which sections are included in a class document?()    

    • A、 The description of the class and its purpose
    • B、 A list of methods in its super class
    • C、 A list of member variable
    • D、 The class hierarchy

    正确答案:A,C,D

  • 第19题:

    单选题
    class Super {  public int i = 0;  public Super(String text) {  i = 1; }  }  public class Sub extends Super {  public Sub(String text) {  i = 2;  }   public static void main(String args[]) {  Sub sub = new Sub(“Hello”);  System.out.println(sub.i);  }  }  What is the result?()
    A

     0

    B

     1

    C

     2

    D

     Compilation fails.


    正确答案: B
    解析: This code is perfectly legal and the answer is C. 

  • 第20题:

    多选题
    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().


    正确答案: A,B
    解析: 暂无解析

  • 第21题:

    单选题
    public class Person {  private String name, comment;  private int age;  public Person(String n, int a, String c) {  name = n; age = a; comment = c;  }  public boolean equals(Object o) {  if(! (o instanceof Person)) return false;  Person p = (Person)o;  return age == p.age && name.equals(p.name);  }  }  What is the appropriate definition of the hashCode method in class Person?()
    A

     return super.hashCode();

    B

     return name.hashCode() + age * 7;

    C

     return name.hashCode() + comment.hashCode() /2;

    D

     return name.hashCode() + comment.hashCode() / 2 - age * 3;


    正确答案: D
    解析: 暂无解析

  • 第22题:

    单选题
    class super {  public int getLength()  {return 4;}  }  public class Sub extends Super {  public long getLength() {return 5;}  public static void main (String[]args)  {  super sooper = new Super ();  Sub sub = new Sub();  System.out.printIn(  sooper.getLength()+ “,” + sub.getLength()   };  }  What is the output?()
    A

     4, 4

    B

     4, 5

    C

     5, 4

    D

     5, 5

    E

     The code will not compile.


    正确答案: C
    解析: 暂无解析

  • 第23题:

    单选题
    class super (   public int I = 0;   public super (string text) (   I = 1   )   )     public class sub extends super (   public sub (string text) (   i= 2   )   public static void main (straing args) (  sub sub = new sub (“Hello”);   system.out. PrintIn(sub.i);  )   )   What is the result?()
    A

     Compilation will fail.

    B

     Compilation will succeed and the program will print “0”

    C

     Compilation will succeed and the program will print “1”

    D

     Compilation will succeed and the program will print “2”


    正确答案: D
    解析: 暂无解析

  • 第24题:

    多选题
    public class Car {  private int wheelCount;  private String vin;  public Car(String vin) {  this.vin = vin;  this.wheelCount = 4;  }  public String drive() {  return “zoom-zoom”;  }  public String getInfo() {  return “VIN: “+ vin + “wheels: “+ wheelCount;  }  }  And:  public class MeGo extends Car {  public MeGo(String vin) {  this.wheelCount = 3;  }  }  What two must the programmer do to correct the compilation errors?()
    A

    insert a call to this() in the Car constructor

    B

    insert a call to this() in the MeGo constructor

    C

    insert a call to super() in the MeGo constructor

    D

    insert a call to super(vin) in the MeGo constructor

    E

    change the wheelCount variable in Car to protected

    F

    change line 3 in the MeGo class to super.wheelCount = 3;


    正确答案: C,F
    解析: 暂无解析