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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.


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更多 “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.” 相关考题
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考题 单选题Which will declare a method that forces a subclass to implement it? ()A  Public double methoda();B  Static void methoda (double d1) {}C  Public native double methoda();D  Abstract public void methoda();E  Protected void methoda (double d1){}

考题 单选题Which will declare a method that is available to all members of the same package and can be referenced without an instance of the class?()A  Abstract public void methoda();B  Public abstract double methoda();C  Static void methoda(double d1){}D  Public native double methoda()  {}E  Protected void methoda(double d1)  {}

考题 单选题public class TestA{   public void methodA()  throws IOException{   //……   }   }   public class TestB extends TestA{   public void methodA()  throws EOFException{   //……   }   }   public class TestC extends TestA{   public void methodA()  throws Exception{   //……   }   }   当编译类TestC的时候,结果是哪项?()A  正常B  编译错误C  运行错误D  以上都不对

考题 单选题Which will declare a method that is available to all members of the same package and be referenced without an instance of the class?()A  abstract public void methoda ();B  public abstract double inethoda ();C  static void methoda (double dl) {}D  public native double methoda () {}E  protected void methoda (double dl) {}

考题 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  NullPointerExceptionC  NumberFormatExceptionD  IllegalArgumentExceptionE  ExceptionlnlnitializerError

考题 多选题public class OuterClass {   private double d1 1.0;   //insert code here   }   You need to insert an inner class declaration at line2. Which two inner class declarations are valid?()Astatic class InnerOne {  public double methoda() {return d1;}  }Bstatic class InnerOne {  static double methoda() {return d1;}  }Cprivate class InnerOne {  public double methoda() {return d1;}  }Dprotected class InnerOne {  static double methoda() {return d1;}  }Epublic abstract class InnerOne {  public abstract double methoda();  }

考题 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.

考题 单选题1. class Pizza {  2. java.util.ArrayList toppings;  3. public final void addTopping(String topping) {  4. toppings.add(topping); 5. }  6. }  7. public class PepperoniPizza extends Pizza {  8. public void addTopping(String topping) {  9. System.out.println(”Cannot add Toppings”);  10. }  11. public static void main(String[] args) {  12. Pizza pizza = new PepperoniPizza();  13. pizza.addTopping(”Mushrooms”);  14. }  15. }  What is the result?()A  Compilation fails.B  Cannot add ToppingsC  The code runs with no output.D  A NullPointerException is thrown in Line 4.

考题 单选题Which will declare the method that forces a subclass to implement it?()A  public double methoda ():B  static void methoda(double d1) {}C  public native double methoda ():D  abstract public foid methoda ():E  protected void methoda (double d1) {}

考题 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?()Ai2 == startingI returns true.Bi2 == startingI returns false.Ci2.equals(startingI) returns true.Di2.equals(startingI) returns false.