单选题10. public class ClassA {  11. public void count(int i) {  12. count(++i);  13. }  14. }  And:  20. ClassA a = new ClassA();  21. a.count(3);  Which exception or error should be thrown by the virtual machine?()AStackOverflowErrorBNullPointerExceptionCN

题目
单选题
10. public class ClassA {  11. public void count(int i) {  12. count(++i);  13. }  14. }  And:  20. ClassA a = new ClassA();  21. a.count(3);  Which exception or error should be thrown by the virtual machine?()
A

 StackOverflowError

B

 NullPointerException

C

 NumberFormatException

D

 IllegalArgumentException

E

 ExceptionlnlnitializerError


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更多“单选题10. public class ClassA {  11. public void count(int i) {  12. count(++i);  13. }  14. }  And:  20. ClassA a = new ClassA();  21. a.count(3);  Which exception or error should be thrown by the virtual machine?()A  StackOverflowErrorB  NullPointerExcepti”相关问题
  • 第1题:

    11. class Converter {  12. public static void main(String[] args) {  13. Integer i = args[0];  14. int j = 12;  15. System.out.println(”It is “ + (j==i) + “that j==i.”);  16. }  17. }  What is the result when the programmer attempts to compile the code and run it with the command java Converter 12?() 

    • A、 It is true that j==i.
    • B、 It is false that j==i.
    • C、 An exception is thrown at runtime.
    • D、 Compilation fails because of an error in line 13.

    正确答案:D

  • 第2题:

    class ClassA {  public int numberOfinstances;  protected ClassA(int numberOfinstances) {  this.numberOflnstances = numberOfinstances;  }  }  public class ExtendedA extends ClassA {  private ExtendedA(int numberOfinstances) {  super(numberOflnstances);  }  public static void main(String[] args) {  ExtendedA ext = new ExtendedA(420);  System.out.print(ext.numberOflnstances);  }  }  Which is true?() 

    • A、 420 is the output.
    • B、 An exception is thrown at runtime.
    • C、 All constructors must be declared public.
    • D、 Constructors CANNOT use the private modifier.
    • E、 Constructors CANNOT use the protected modifier.

    正确答案:A

  • 第3题:

    1. class A implements runable (   2. int i;   3. public void run () (   4. try (   5. thread.sleep(5000);   6. i= 10;   7. ) catch(InterruptedException e) {}   8. )   9. )   10.   11. public class Test {   12. public static void main (string args) (   13. try (   14. A a = new A ();   15. Thread t = new Thread (a);  16. t.start();  17.   18. int j= a.i;   19.   20. ) catch (Exception e) {}   21. )   22. )   Which statement al line 17 will ensure that j=10 at line 19?()

    • A、 a.wait();
    • B、 t.wait();
    • C、 t.join();
    • D、 t.yield();
    • E、 t.notify();
    • F、 a.notify();
    • G、 t.interrupt();

    正确答案:C

  • 第4题:

    10. public class ClassA {  11. public void methodA() {  12. ClassB classB = new ClassB();  13. classB.getValue();  14. }  15. }  And:  20. class ClassB {  21. public ClassC classC;  22.  23. public String getValue() {  24. return classC.getValue();  25. }  26. }  And:  30. class ClassC {  31. public String value;  32.  33. public String getValue() {  34. value = “ClassB”;  35. return value;  36. }  37. }  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:D

  • 第5题:

    public class ClassA {  public int getValue() {  int value=0;  boolean setting = true;  String title=”Hello”;  (value || (setting && title == “Hello”)) { return 1; }  (value == 1 & title.equals(”Hello”)) { return 2; }  }  } And:  ClassA a = new ClassA();  a.getValue();  What is the result?() 

    • A、 1
    • B、 2
    • C、 Compilation fails.
    • D、 The code runs with no output.
    • E、 An exception is thrown at runtime.

    正确答案:C

  • 第6题:

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

    正确答案:F

  • 第7题:

    单选题
    11. static classA {  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

     B

    B

     The code runs with no output.

    C

     An exception is thrown at runtime.

    D

     Compilation fails because of an error in line 15.

    E

     Compilation fails because of an error in line 18.

    F

     Compilation fails because of an error in line 19.


    正确答案: B
    解析: 暂无解析

  • 第8题:

    单选题
    class ClassA {  public int numberOfinstances;  protected ClassA(int numberOfinstances) {  this.numberOflnstances = numberOfinstances;  }  }  public class ExtendedA extends ClassA {  private ExtendedA(int numberOfinstances) {  super(numberOflnstances);  }  public static void main(String[] args) {  ExtendedA ext = new ExtendedA(420);  System.out.print(ext.numberOflnstances);  }  }  Which is true?()
    A

     420 is the output.

    B

     An exception is thrown at runtime.

    C

     All constructors must be declared public.

    D

     Constructors CANNOT use the private modifier.

    E

     Constructors CANNOT use the protected modifier.


    正确答案: E
    解析: 暂无解析

  • 第9题:

    单选题
    1. class A implements runable (   2. int i;   3. public void run () (   4. try (   5. thread.sleep(5000);   6. i= 10;   7. ) catch(InterruptedException e) {}   8. )   9. )   10.   11. public class Test {   12. public static void main (string args) (   13. try (   14. A a = new A ();   15. Thread t = new Thread (a);  16. t.start();  17.   18. int j= a.i;   19.   20. ) catch (Exception e) {}   21. )   22. )   Which statement al line 17 will ensure that j=10 at line 19?()
    A

     a.wait();

    B

     t.wait();

    C

     t.join();

    D

     t.yield();

    E

     t.notify();

    F

     a.notify();

    G

     t.interrupt();


    正确答案: D
    解析: 暂无解析

  • 第10题:

    单选题
    10. public class ClassA {  11. public void methodA() {  12. ClassB classB = new ClassB();  13. classB.getValue();  14. }  15. }  And:  20. class ClassB {  21. public ClassC classC;  22.  23. public String getValue() {  24. return classC.getValue();  25. }  26. }  And:  30. class ClassC {  31. public String value;  32.  33. public String getValue() {  34. value = “ClassB”;  35. return value;  36. }  37. }  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: D
    解析: 暂无解析

  • 第11题:

    单选题
    11. class Converter {  12. public static void main(String[] args) {  13. Integer i = args[0];  14. int j = 12;  15. System.out.println(”It is “ + (j==i) + “that j==i.”);  16. }  17. }  What is the result when the programmer attempts to compile the code and run it with the command java Converter 12?()
    A

     It is true that j==i.

    B

     It is false that j==i.

    C

     An exception is thrown at runtime.

    D

     Compilation fails because of an error in line 13.


    正确答案: D
    解析: 暂无解析

  • 第12题:

    多选题
    10. public class MyClass {  11.  12. public Integer startingI;  13. public void methodA() {  14. Integer i = new Integer(25);  15. startingI = i;  16. methodB(i);  17. }  18. private void methodB(Integer i2) {  19. i2 = i2.intValue();  20.  21. }  22. }  If methodA is invoked, which two are true at line 20?()
    A

    i2 == startingI returns true.

    B

    i2 == startingI returns false.

    C

    i2.equals(startingI) returns true.

    D

    i2.equals(startingI) returns false.


    正确答案: A,B
    解析: 暂无解析

  • 第13题:

    1. public class Test { 2. public static String output =””; 3.  4. public static void foo(int i) { 5. try { 6. if(i==1) { 7. throw new Exception(); 8. } 9. output += “1”; 10. } 11. catch(Exception e) { 12. output += “2”; 13. return; 14. } 15. finally { 16. output += “3”;17. } 18. output += “4”; 19. } 20.  21. public static void main(String args[]) { 22. foo(0); 23. foo(1); 24.  25. }26. } What is the value of the variable output at line 23?()


    正确答案:13423

  • 第14题:

    11.classA {  12. public void process() { System.out.print(”A “); } }  13. class B extends A {  14. public void process() throws RuntimeException {  15. super.process();  16. if (true) throw new RuntimeException();  17. System.out.print(“B”); }}  18. public static void main(String[] args) {  19. try { ((A)new B()).process(); }  20. catch (Exception e) { System.out.print(”Exception “); }  21. }  What is the result?() 

    • A、 Exception
    • B、 A Exception
    • C、 A Exception B
    • D、 A B Exception
    • E、 Compilation fails because of an error in line 14.
    • F、 Compilation fails because of an error in line 19.

    正确答案:B

  • 第15题:

    10. class Inner {  11. private int x;  12. public void setX( int x) { this.x = x; }  13. public int getX() { return x; }  14. }  15.  16. class Outer {  17. private Inner y;  18. public void setY( Inner y) { this.y = y; }  19. public Inner getY() { return y; }  20. }  21.  22. public class Gamma {  23. public static void main( String[] args) { 24. Outer o = new Outer(); 25. Inner i = new Inner();  26.int n=10;  27. i.setX(n);  28. o.setY(i);  29. // insert code here  30. System.out.println( o.getY().getX());  31. }  32. }  Which three code fragments, added individually at line 29, produce the output 100?()

    • A、 n = 100;
    • B、 i.setX( 100);
    • C、 o.getY().setX( 100);
    • D、 i = new Inner(); i.setX( 100);
    • E、 o.setY( i); i = new Inner(); i.setX( 100);
    • F、 i = new Inner(); i.setX( 100); o.setY( i);

    正确答案:B,C,F

  • 第16题:

    10. public class MyClass {  11.  12. public Integer startingI;  13. public void methodA() {  14. Integer i = new Integer(25);  15. startingI = i;  16. methodB(i);  17. }  18. private void methodB(Integer i2) {  19. i2 = i2.intValue();  20.  21. }  22. }  If methodA is invoked, which two are true at line 20?()

    • A、 i2 == startingI returns true.
    • B、 i2 == startingI returns false.
    • C、 i2.equals(startingI) returns true.
    • D、 i2.equals(startingI) returns false.

    正确答案:B,C

  • 第17题:

    11.classa {  12. public void process() { System.out.print(”a,”); } }  13. class b extends a {  14. public void process() throws IOException {  15. super.process();  16. System.out.print(”b,”);  17. throw new IOException();  18. } }  19. public static void main(String[] args) {  20. try { new b().process(); }  21. catch (IOException e) { System.out.println(”Exception”); } }  What is the result?() 

    • A、 Exception
    • B、 a,b,Exception
    • C、 Compilation fails because of an error in line 20.
    • D、 Compilation fails because of an error in line 14.
    • E、 A NullPointerException is thrown at runtime.

    正确答案:D

  • 第18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19题:

    多选题
    10. class Inner {  11. private int x;  12. public void setX( int x) { this.x = x; }  13. public int getX() { return x; }  14. }  15.  16. class Outer {  17. private Inner y;  18. public void setY( Inner y) { this.y = y; }  19. public Inner getY() { return y; }  20. }  21.  22. public class Gamma {  23. public static void main( String[] args) { 24. Outer o = new Outer(); 25. Inner i = new Inner();  26.int n=10;  27. i.setX(n);  28. o.setY(i);  29. // insert code here  30. System.out.println( o.getY().getX());  31. }  32. }  Which three code fragments, added individually at line 29, produce the output 100?()
    A

    n = 100;

    B

    i.setX( 100);

    C

    o.getY().setX( 100);

    D

    i = new Inner(); i.setX( 100);

    E

    o.setY( i); i = new Inner(); i.setX( 100);

    F

    i = new Inner(); i.setX( 100); o.setY( i);


    正确答案: E,C
    解析: 暂无解析

  • 第20题:

    单选题
    11.classA {  12. public void process() { System.out.print(”A “); } }  13. class B extends A {  14. public void process() throws RuntimeException {  15. super.process();  16. if (true) throw new RuntimeException();  17. System.out.print(“B”); }}  18. public static void main(String[] args) {  19. try { ((A)new B()).process(); }  20. catch (Exception e) { System.out.print(”Exception “); }  21. }  What is the result?()
    A

     Exception

    B

     A Exception

    C

     A Exception B

    D

     A B Exception

    E

     Compilation fails because of an error in line 14.

    F

     Compilation fails because of an error in line 19.


    正确答案: F
    解析: 暂无解析

  • 第21题:

    单选题
    Given:   11. public static void main(String[] args) {   12. Object obj = new int[] { 1, 2, 3 };   13. int[] someArray = (int[])obj;   14. for (int i : someArray) System.out.print(i + " ");   15. }   What is the result? ()
    A

     Compilation fails because of an error in line 13.

    B

     A ClassCastException is thrown at runtime.

    C

     1 2 3

    D

     Compilation fails because of an error in line 14.

    E

     Compilation fails because of an error in line 12.


    正确答案: A
    解析: 暂无解析

  • 第22题:

    单选题
    11.classa {  12. public void process() { System.out.print(”a,”); } }  13. class b extends a {  14. public void process() throws IOException {  15. super.process();  16. System.out.print(”b,”);  17. throw new IOException();  18. } }  19. public static void main(String[] args) {  20. try { new b().process(); }  21. catch (IOException e) { System.out.println(”Exception”); } }  What is the result?()
    A

     Exception

    B

     a,b,Exception

    C

     Compilation fails because of an error in line 20.

    D

     Compilation fails because of an error in line 14.

    E

     A NullPointerException is thrown at runtime.


    正确答案: C
    解析: 暂无解析

  • 第23题:

    单选题
    public class ClassA {  public int getValue() {  int value=0;  boolean setting = true;  String title=”Hello”;  (value || (setting && title == “Hello”)) { return 1; }  (value == 1 & title.equals(”Hello”)) { return 2; }  }  } And:  ClassA a = new ClassA();  a.getValue();  What is the result?()
    A

     1

    B

     2

    C

     Compilation fails.

    D

     The code runs with no output.

    E

     An exception is thrown at runtime.


    正确答案: D
    解析: 暂无解析