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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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A.B.C.D.E.F.
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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
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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
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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.
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