SCDCD(310-081)

单选题1. class A {  2. public byte file Number ( ) { 3. return l;  4. }  5. }  6.  7. Class B extends A {  8. public short getNumber( ) {  9.  return 2;  10. }  11.  12. public short getNumber( ) {  13. B b = new B( );  14. System.out.printIn(b.getNumber( ))

题目
单选题
1. class A {  2. public byte file Number ( ) { 3. return l;  4. }  5. }  6.  7. Class B extends A {  8. public short getNumber( ) {  9.  return 2;  10. }  11.  12. public short getNumber( ) {  13. B b = new B( );  14. System.out.printIn(b.getNumber( ));  15. }  16. }   What is the result()?
A

 Compilation succeeds and l is printed.

B

 Compilation succeeds and 2 printed.

C

 An error at line 8 cause compilation to fail.

D

 An error at line 14 cause complication to fail.

E

 Complication succeeds but an exception is thrown at line 14.

参考答案和解析
正确答案: D
解析: 暂无解析
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相似问题和答案

第1题:

1. public class SimpleCalc {  2. public int value;  3. public void calculate() { value += 7; }  4. } And:  1. public class MultiCalc extends SimpleCalc {  2. public void calculate() { value -= 3; }  3. public void calculate(int multiplier) {  4. calculate();  5. super.calculate();  6. value *=multiplier;  7. }  8. public static void main(String[] args) {  9. MultiCalc calculator = new MultiCalc();  10. calculator.calculate(2);  11. System.out.println(”Value is: “+ calculator.value);  12. }  13. }  What is the result?() 

  • A、 Value is: 8
  • B、 Compilation fails.
  • C、 Value is: 12
  • D、 Value is: -12
  • E、 The code runs with no output.
  • F、 An exception is thrown at runtime.

正确答案:A

第2题:

1. public class A {  2. public void doit() {  3. }  4. public String doit() {  5. return “a”;  6. }  7. public double doit(int x) {  8. return 1.0;  9. }  10.}  What is the result?() 

  • A、 An exception is thrown at runtime.
  • B、 Compilation fails because of an error in line 7.
  • C、 Compilation fails because of an error in line 4.
  • D、 Compilation succeeds and no runtime errors with class A occur.

正确答案:C

第3题:

class A

{public int getNumber(int a){return a+1;}}

class B extends A

{public int getNumber(int a, char c){return a+2;}public static void main(String[] args){B b=new B();System.out.println(b.getNumber(0));}}

what is the result?()

A.compilation succeeds and 1 is printed

B.compilation succeeds and 2 is printed

C.compilation succeeds and 3 is printed

D.An error at this program cause compilation to fail


参考答案:A

第4题:

class A {   public byte getNumber () {   return 1;   }   }   class B extends A {   public short getNumber() {   return 2;   }    public static void main (String args) {   B b = new B ();    System.out.printIn(b.getNumber())  }   }   What is the result?()  

  • A、 Compilation succeeds and 1 is printed.
  • B、 Compilation succeeds and 2 is printed.
  • C、 An error at line 8 causes compilation to fail.
  • D、 An error at line 14 causes compilation to fail.
  • E、 Compilation succeeds but an exception is thrown at line 14.

正确答案:C

第5题:

1. class SuperClass {  2. public a geta() {  3. return new a();  4. }  5. }  6. class SubClass extends SuperClass {  7. public b geta() {  8. return new b();  9. }  10. }  Which is true?() 

  • A、 Compilation will succeed if a extends b.
  • B、 Compilation will succeed if b extends a.
  • C、 Compilation will always fail because of an error in line 7.
  • D、 Compilation will always fail because of an error in line 8.

正确答案:B

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 line6, causes compilation to fail?()  

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

正确答案:A

第7题:

1. class A {  2. public byte getNumber ()  {  3.   return 1;  4.   }  5. }  6.    7. class B extends A {  8. public short getNumber()  {  9.  return 2;  10. }  11.    12. public static void main (String args[]) {   13.    B  b = new B ();  14.      System.out.printIn(b.getNumber())     15.   }  16. }    What is the result?()  

  • A、 Compilation succeeds and 1 is printed.
  • B、 Compilation succeeds and 2 is printed.
  • C、 An error at line 8 causes compilation to fail.
  • D、 An error at line 14 causes compilation to fail.
  • E、 Compilation succeeds but an exception is thrown at line 14.

正确答案:C

第8题:

1. class A {  2. public int getNumber(int a) {  3.     return a + 1;  4. }  5. }  6.    7. class B extends A {  8. public int getNumber (int a) {  9. return a + 2  10. }  11.    12. public static void main (String args[])  {  13. A a = new B();  14. System.out.printIn(a.getNumber(0));  15.    } 16. }     What is the result?()  

  • A、 Compilation succeeds and 1 is printed.
  • B、 Compilation succeeds and 2 is printed.
  • C、 An error at line 8 causes compilation to fail.
  • D、 An error at line 13 causes compilation to fail.
  • E、 An error at line 14 causes compilation to fail.

正确答案:B

第9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 Toppings
  • C、 The code runs with no output.
  • D、 A NullPointerException is thrown in Line 4.

正确答案:A

第10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

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