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2016 Nov 1z0-808 practice question

Q41. Which statement is/are true? 

I. Default constructor only contains "super();" call. 

II. We can't use any access modifier with a constructor. 

III. A constructor should not have a return type. 

A. Only I. 

B. Only II. 

C. Only I and II. 

D. Only I and III. 

E. AIL 

Answer:

Explanation: 

Statement I is correct as the default constructor only contains super0 call 

Statement II is incorrect as we can use any access modifier with a constructor. 

Statement III is correct as constructor can't have return type, even void. 

So option D is correct. 

httpsy/docs.oracle.com/javase/tutorial/iava/javaOO/construaors.html 


Q42. Given: 

Which is true? 

A. Sum for 0 to 0 = 55 

B. Sum for 0 to 10 = 55 

C. Compilation fails due to error on line 6. 

D. Compilation fails due to error on line 7. 

E. An Exception is thrown at the runtime. 

Answer:

Explanation: 

Loop variables scope limited to that enclosing loop. So in this case, the scope of the loop variable x declared at line 5, limited to that for loop. Trying to access that variable at line 7, which is out of scope of the variable x, causes a compile time error. So compilation fails 

due to error at line 7. Hence option D is correct. 

Options A and B are incorrect, since code fails to compile. 

Reference: httpsy/docs.oracle.com/javase/tutorial/java/nutsandbolts/variables.html 


Q43. You are asked to develop a program for a shopping application, and you are given the following information: 

. The application must contain the classes Toy, EduToy, and consToy. The Toy class is the superclass of the other two classes. 

. The int caicuiatePrice (Toy t) method calculates the price of a toy. 

. The void printToy (Toy t) method prints the details of a toy. 

Which definition of the Toy class adds a valid layer of abstraction to the class hierarchy? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer:


Q44. Consider 

Integer number = Integer.valueOff 808.1"); 

Which is true about the above statement? 

A. The value of the variable number will be 808.1 

B. The value of the variable number will be 808 

C. The value of the variable number will be 0. 

D. A NumberFormatException will be throw. 

E. It will not compile. 

Answer:

Explanation: 

The Integer class value of 0 returns an Integer from given string. But we need to pass string which has correct format for integer otherwise it will throw a NumberFormatException. In this case we have passed string which is not an integer value (since what we passed is fractional number), so option D is correct. 


Q45. Which statement best describes encapsulation? 

A. Encapsulation ensures that classes can be designed so that only certain fields and methods of an object are accessible from other objects. 

B. Encapsulation ensures that classes can be designed so that their methods are inheritable. 

C. Encapsulation ensures that classes can be designed with some fields and methods declared as abstract. 

D. Encapsulation ensures that classes can be designed so that if a method has an argument MyType x, any subclass of MyType can be passed to that method. 

Answer:


Renew 1z0-808 free exam:

Q46. Given the code fragment: 

Which statement is true? 

A. After line 8, three objects are eligible for garbage collection 

B. After line 8, two objects are eligible for garbage collection 

C. After line 8, one object is eligible for garbage collection 

D. After line 8, none of the objects are eligible for garbage collection 

Answer:


Q47. Given: 

And the commands: 

Javac Jump.java 

Java Jump crazy elephant is always 

What is the result? 

A. Lazy lion is jumping 

B. Lion is always jumping 

C. Crazy elephant is jumping 

D. Elephant is always jumping 

E. Compilation fails 

Answer:


Q48. Given the code fragment: 

And given the requirements: 

. If the value of the qty variable is greater than or equal to 90, discount = 0.5 

. If the value of the qty variable is between 80 and 90, discount = 0.2 

Which two code fragments can be independently placed at line n1 to meet the requirements? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

E. Option E 

Answer: A,C 


Q49. Which of the following can fill in the blank in this code to make it compile? (Select 2 options.) 

A. On line 1, fill in throws 

B. On line 1, fill in throws new 

C. On line 2, fill in throw new 

D. On line 2, fill in throws 

E. On line 2, fill in throws new 

Answer: A,C 

Explanation: 

Option A and C are the correct answer. 

In a method declaration, the keyword throws is used. So here at line 1 we have to use 

option A. 

To actually throw an exception, the keyword throw is used and a new exception is created, 

so at line 2 we have to use throw and new keywords, which is option C. Finally it will look 

like; 

public void method() throws Exception { 

throw new Exception0; 

REFERENCE : httpsy/docs.oracle.com/javase/tutorial/essential/io/fileOps.html#exception 

The correct answer is: On line 1, fill in throws. On line 2, fill in throw new 


Q50. Given: 

Which two classes use the shape class correctly? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

E. Option E 

F. Option F 

Answer: B,E 

Explanation: When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class (E). However, if it does not, then the subclass must also be declared abstract (B). Note: An abstract class is a class that is declared abstract—it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed.