单选题Click the Exhibit button. Given this code from Class B: 25.A a1 = new A(); 26.A a2 = new A(); 27.A a3 = new A(); 28.System.out.println(A.getInstanceCount()); What is the result?()ACompilation of class A fails.BLine 28 prints the value 3 to System.out.

题目
单选题
Click the Exhibit button. Given this code from Class B: 25.A a1 = new A(); 26.A a2 = new A(); 27.A a3 = new A(); 28.System.out.println(A.getInstanceCount()); What is the result?()
A

Compilation of class A fails.

B

Line 28 prints the value 3 to System.out.

C

Line 28 prints the value 1 to System.out.

D

A runtime error occurs when line 25 executes.

E

Compilation fails because of an error on line 28.


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更多“单选题Click the Exhibit button. Given this code from Class B: 25.A a1 = new A(); 26.A a2 = new A(); 27.A a3 = new A(); 28.System.out.println(A.getInstanceCount()); What is the result?()A Compilation of class A fails.B Line 28 prints the value 3 to System.”相关问题
  • 第1题:

    public class Threads3 implements Runnable {  public void run() {  System.out.print(”running”);  }  public static void main(String[] args) {  Thread t = new Thread(new Threads3());  t.run();  t.run();  t.start();  }  }  What is the result?() 

    • A、 Compilation fails.
    • B、 An exception is thrown at runtime.
    • C、 The code executes and prints “running”.
    • D、 The code executes and prints “runningrunning”.
    • E、 The code executes and prints “runningrunningrunning”.

    正确答案:E

  • 第2题:

    public class TestOne implements Runnable {  public static void main (String[] args) throws Exception {  Thread t = new Thread(new TestOne());  t.start();  System.out.print(”Started”);  t.join();  System.out.print(”Complete”);  }  public void run() {  for (int i= 0; i< 4; i++) {   System.out.print(i);  }  }  }  What can be a result?()

    • A、 Compilation fails.
    • B、 An exception is thrown at runtime.
    • C、 The code executes and prints “StartedComplete”.
    • D、 The code executes and prints “StartedComplete0123”.
    • E、 The code executes and prints “Started0l23Complete”.

    正确答案:E

  • 第3题:

    1. public class A {  2.  3. private int counter = 0;  4.  5. public static int getInstanceCount() {  6. return counter;  7. }  8.  9. public A() {  10. counter++;  11. }  12.  13. }  Given this code from Class B:  25.A a1 =new A();  26. A a2 =new A();  27. A a3 =new A();  28. System.out.printIn(A.getInstanceCount() ); What is the result?() 

    • A、 Compilation of class A fails.
    • B、 Line 28 prints the value 3 to System.out.
    • C、 Line 28 prints the value 1 to System.out.
    • D、 A runtime error occurs when line 25 executes.
    • E、 Compilation fails because of an error on line 28.

    正确答案:A

  • 第4题:

    Given:   11. static class A {   12. void process() throws Exception { throw new Exception(); }   13. }   14. static class B extends A {   15. void process() { System.out.println("B "); }   16. }   17. public static void main(String[] args) {   18. A a = new B();   19. a.process();   20. }   What is the result? ()

    • A、 Compilation fails because of an error in line 19.
    • B、 An exception is thrown at runtime.
    • C、 B
    • D、 Compilation fails because of an error in line 18.
    • E、 Compilation fails because of an error in line 15. 
    • F、 The code runs with no output.

    正确答案:A

  • 第5题:

    单选题
    Click the Exhibit button. Given: ClassA a = new ClassA( ); a.methodA( ); What is the result? ()
    A

    Compilation fails.

    B

    ClassC is displayed.

    C

    The code runs with no output.

    D

    An exception is thrown at runtime.


    正确答案: B
    解析: 暂无解析

  • 第6题:

    单选题
    public class TestOne implements Runnable {  public static void main (String[] args) throws Exception {  Thread t = new Thread(new TestOne());  t.start();  System.out.print(”Started”);  t.join();  System.out.print(”Complete”);  }  public void run() {  for (int i= 0; i< 4; i++) {   System.out.print(i);  }  }  }  What can be a result?()
    A

     Compilation fails.

    B

     An exception is thrown at runtime.

    C

     The code executes and prints “StartedComplete”.

    D

     The code executes and prints “StartedComplete0123”.

    E

     The code executes and prints “Started0l23Complete”.


    正确答案: E
    解析: 暂无解析

  • 第7题:

    单选题
    Given:  Which code, inserted at line 15, creates an instance of the Point class defined in Line?()
    A

     Line l = new Line() ; l.Point p = new l.Point();

    B

     Line.Point p = new Line.Point();

    C

     The Point class cannot be instatiated at line 15.

    D

     Point p = new Point();


    正确答案: C
    解析: 暂无解析

  • 第8题:

    单选题
    Click the Exhibit button.   Given this code from Class B:   25. A a1 = new A();   26. A a2 = new A();   27. A a3 = new A();   28. System.out.println(A.getInstanceCount());   What is the result?()
    A

     Compilation of class A fails.

    B

     Line 28 prints the value 3 to System.out.

    C

     Line 28 prints the value 1 to System.out.

    D

     Compilation fails because of an error on line 28.

    E

     A runtime error occurs when line 25 executes.


    正确答案: E
    解析: 暂无解析

  • 第9题:

    单选题
    public class Threads5 {  public static void main (String[] args) {  new Thread(new Runnable() {  public void run() {  System.out.print(”bar”);  } }).start();  }  }  What is the result?()
    A

     Compilation fails.

    B

     An exception is thrown at runtime.

    C

     The code executes normally and prints “bar”.

    D

     The code executes normally, but nothing prints.


    正确答案: A
    解析: 暂无解析

  • 第10题:

    单选题
    What is the result?()
    A

    Compilation of class A fails.

    B

    Line 28 prints the value 3 to System.out.

    C

    Line 28 prints the value 1 to System.out.

    D

    A runtime error occurs when line 25 executes.

    E

    Compilation fails because of an error on line 28.


    正确答案: E
    解析: 暂无解析

  • 第11题:

    多选题
    Click the Exhibit button. Given: Which two statements are true if a NullPointerException is thrown on line 3 of class C? ()
    A

    The application will crash.

    B

    The code on line 29 will be executed.

    C

    The code on line 5 of class A will execute.

    D

    The code on line 5 of class B will execute.

    E

    The exception will be propagated back to line 27.


    正确答案: A,B
    解析: 暂无解析

  • 第12题:

    单选题
    public class test {  public static void add3 (Integer i)  int val = i.intValue ( );  val += 3;  i = new Integer (val);  } public static void main (String args [ ] )  {  Integer  i = new Integer (0);  add3 (i);  system.out.printIn (i.intValue ( )  );  } What is the result?()
    A

     Compilation will fail.

    B

     The program prints “0”.

    C

     The program prints “3”.

    D

     Compilation will succeed but an exception will be thrown at line 3.


    正确答案: C
    解析: 暂无解析

  • 第13题:

    public class Threads5 {  public static void main (String[] args) {  new Thread(new Runnable() {  public void run() {  System.out.print(”bar”);  } }).start();  }  }  What is the result?() 

    • A、 Compilation fails.
    • B、 An exception is thrown at runtime.
    • C、 The code executes normally and prints “bar”.
    • D、 The code executes normally, but nothing prints.

    正确答案:C

  • 第14题:

    public class test {   public static void add3 (Integer i){  int val = i.intValue ( );   val += 3;   i = new Integer (val);    }     public static void main (String args [ ] )  { Integer i = new Integer (0);    add3 (i);   system.out.printIn (i.intValue ( ) );   }    }   What is the result?()

    • A、 Compilation will fail.
    • B、 The program prints “0”.
    • C、 The program prints “3”.
    • D、 Compilation will succeed but an exception will be thrown at line 3.

    正确答案:B

  • 第15题:

    public class Threads4 {  public static void main (String[] args) {  new Threads4().go();  }  public void go() {  Runnable r = new Runnable() { public void run() {  System.out.print(”foo”);  }  };  Thread t = new Thread(r);  t.start();  t.start();  }  }  What is the result?() 

    • A、 Compilation fails.
    • B、 An exception is thrown at runtime.
    • C、 The code executes normally and prints „foo”.
    • D、 The code executes normally, but nothing is printed.

    正确答案:B

  • 第16题:

    单选题
    public class Threads3 implements Runnable {  public void run() {  System.out.print(”running”);  }  public static void main(String[] args) {  Thread t = new Thread(new Threads3());  t.run();  t.run();  t.start();  }  }  What is the result?()
    A

     Compilation fails.

    B

     An exception is thrown at runtime.

    C

     The code executes and prints “running”.

    D

     The code executes and prints “runningrunning”.

    E

     The code executes and prints “runningrunningrunning”.


    正确答案: D
    解析: 暂无解析

  • 第17题:

    单选题
    Given: What is the result?()
    A

    Compilation fails.

    B

    An exception is thrown at runtime.

    C

    The code executes and prints "running".

    D

    The code executes and prints "runningrunning".

    E

    The code executes and prints "runningrunningrunning".


    正确答案: C
    解析: 暂无解析

  • 第18题:

    单选题
    public class Threads4 {  public static void main (String[] args) {  new Threads4().go();  }  public void go() {  Runnable r = new Runnable() { public void run() {  System.out.print(”foo”);  }  };  Thread t = new Thread(r);  t.start();  t.start();  }  }  What is the result?()
    A

     Compilation fails.

    B

     An exception is thrown at runtime.

    C

     The code executes normally and prints „foo”.

    D

     The code executes normally, but nothing is printed.


    正确答案: D
    解析: 暂无解析

  • 第19题:

    单选题
    Click the Exhibit button.   Given: ClassA a = new ClassA();   a.methodA();   What is the result?()
    A

     The code runs with no output.

    B

     Compilation fails.

    C

     An exception is thrown at runtime.

    D

     ClassC is displayed.


    正确答案: C
    解析: 暂无解析

  • 第20题:

    单选题
    Click the Exhibit button. What is the result?()
    A

    Line 26 prints "a" to System.out.

    B

    Line 26 prints "b" to System.out.

    C

    An exception is thrown at line 26 at runtime.

    D

    Compilation of class A will fail due to an error in line 6.


    正确答案: C
    解析: 暂无解析

  • 第21题:

    单选题
    Click the Exhibit button. What is the result?()
    A

    Compilation of class A fails.

    B

    Line 28 prints the value 3 to System.out.

    C

    Line 28 prints the value 1 to System.out.

    D

    A runtime error occurs when line 25 executes.

    E

    Compilation fails because of an error on line 28.


    正确答案: D
    解析: 暂无解析

  • 第22题:

    单选题
    Given: What is the result?()
    A

    Compilation fails.

    B

    exception is thrown at runtime.

    C

    The attribute id in the ItemTest object remains unchanged.

    D

    The attribute id in the ItemTest object is modified to the new value.

    E

    A new ItemTest object is created with the preferred value in the id attribute.


    正确答案: A
    解析: 暂无解析

  • 第23题:

    单选题
    1. public class A {  2.  3. private int counter = 0;  4.  5. public static int getInstanceCount() {  6. return counter;  7. }  8.  9. public A() {  10. counter++;  11. }  12.  13. }  Given this code from Class B:  25.A a1 =new A();  26. A a2 =new A();  27. A a3 =new A();  28. System.out.printIn(A.getInstanceCount() ); What is the result?()
    A

     Compilation of class A fails.

    B

     Line 28 prints the value 3 to System.out.

    C

     Line 28 prints the value 1 to System.out.

    D

     A runtime error occurs when line 25 executes.

    E

     Compilation fails because of an error on line 28.


    正确答案: E
    解析: 暂无解析