Given the following code:     1) class Parent {     2) priva

题目
单选题
Given the following code:     1) class Parent {     2) private String name;     3) public Parent(){}     4) }  5) public class Child extends Parent {     6) private String department;  7) public Child() {}  8) public String getValue(){ return name; }     9) public static void main(String arg[]) {     10) Parent p = new Parent();     11) }  12) }  Which line will cause error?()
A

 line 3

B

 line 6

C

 line 7

D

 line 8

E

 line 10

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相似问题和答案

第1题:

Given:Which method will complete this class?()

A.public int compareTo(Object o){/*more code here*/}

B.public int compareTo(Score other){/*more code here*/}

C.public int compare(Score s1,Score s2){/*more code here*/}

D.public int compare(Object o1,Object o2){/*more code here*/}


参考答案:B

第2题:

Given:Which code, inserted at line 15, allows the class Sprite to compile?()

A.Foo { public int bar() { return 1; }

B.new Foo { public int bar() { return 1; }

C.new Foo() { public int bar() { return 1; }

D.new class Foo { public int bar() { return 1; }


参考答案:C

第3题:

Given:Which three methods, inserted individually at line 14, will correctly complete class Two?()

A.int foo() { /* more code here */ }

B.void foo() { /* more code here */ }

C.public void foo() { /* more code here */ }

D.private void foo() { /* more code here */ }

E.protected void foo() { /* more code here */ }


参考答案:B, C, E

第4题:

Given the following code fragment:     public void create() {     Vector myVect;     myVect = new Vector();      }  Which of the following statements are true?() 

  • A、 The declaration on line 2 does not allocate memory space for the variable myVect.
  • B、 The declaration on line 2 allocates memory space for a reference to a Vector object.
  • C、 The statement on line 2 creates an object of class Vector.
  • D、 The statement on line 3 creates an object of class Vector.
  • E、 The statement on line 3 allocates memory space for an object of class Vector.

正确答案:A,D,E

第5题:

1. public class a {  2. public void method1() {  3. try {  4. B b=new b();  5. b.method2();  6. // more code here  7. } catch (TestException te) {  8. throw new RuntimeException(te);  9. }  10. }  11. }  1. public class b {  2. public void method2() throws TestException {  3. // more code here  4. }  5. }  1. public class TestException extends Exception {  2. }  Given:  31. public void method() {  32. A a=new a();  33. a.method1();  34. }  Which is true if a TestException is thrown on line 3 of class b?()

  • A、 Line 33 must be called within a try block.
  • B、 The exception thrown by method1 in class a is not required to be caught.
  • C、 The method declared on line 31 must be declared to throw a RuntimeException.
  • D、 On line 5 of class a, the call to method2 of class b does not need to be placed in a try/catch block.

正确答案:B

第6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.


参考答案:B, E

第7题:

有如下程序: include using namespace std; class PARENT { public: PARENT() { cout

有如下程序:

include <iostream>

using namespace std;

class PARENT

{

public:

PARENT() { cout <<"PARENT"; }

};

class SON : public PARENT

{

public:

SON() {cout << "SON"; }

};

int main()

{

SON son;

PARENT *p;

p = &son;

return 0;

}

执行上面程序的输出是______。


正确答案:PARENTSON
PARENTSON 解析:此题考查的是派生类的构造。主函数开始在定义SON类的对象son时,会先执行PARENT类的构造函数再执行SON类的构造函数,输出 “PAKENTSON”;接下来的语句定义PARENT和让指针p指向son对象,都并未创建任何对象,所以不会调用构造函数。故最终的输出结果是:PARENTSON。

第8题:

Given:Which two, inserted at line 11, will allow the code to compile?()

A.public class MinMax<?> {

B.public class MinMax<? extends Number> {

C.public class MinMax<N extends Object> {

D.public class MinMax<N extends Number> {

E.public class MinMax<? extends Object> {

F.public class MinMax<N extends Integer> {


参考答案:D, F

第9题:

Given that Thing is a class, how many objects and reference variables are created by the following code?()   Thing item, stuff;   item = new Thing();   Thing entity = new Thing();

  • A、One object is created
  • B、Two objects are created
  • C、Three objects are created
  • D、One reference variable is created
  • E、Two reference variables are created
  • F、Three reference variables are created.

正确答案:B,F

第10题:

Given the following code:     1) class Parent {     2) private String name;     3) public Parent(){}     4) }  5) public class Child extends Parent {     6) private String department;  7) public Child() {}  8) public String getValue(){ return name; }     9) public static void main(String arg[]) {     10) Parent p = new Parent();     11) }  12) }  Which line will cause error?()   

  • A、 line 3
  • B、 line 6
  • C、 line 7
  • D、 line 8
  • E、 line 10

正确答案:D

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