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2017 Mar 1z0-808 practice test

Q121. Given: 

Which inserted at line 11, will provide the following output? 

[21, 15, 11] 

A. list.removelf(e > e%2 != 0); 

B. list.removelf(e -> e%2 != 0); 

C. Ust.removelf(e -> e%2 = 0); 

D. list.remove(e -> e%2 = 0); 

E. None of the above. 

Answer:

Explanation: 

In output we can see that only odd numbers present, so we need to remove only even numbers to get expected output. From Java SE 8, there is new method call removelf which takes predicate object and remove elements which satisfies predicate condition. Predicate has functional method call take object and check if the given condition met or not, if met it returns true, otherwise false. Option C we have passed correct lambda expression to check whether the number is odd or even that matches to the functional method of predicate interface. Option A is incorrect as it is invalid lambda expression. Option B is incorrect as it removes all odd numbers. Option D is incorrect as there is no remove method that takes predicate as argument. https://docs.oracle.eom/javase/8/docs/api/java/util/ArrayList.html 


Q122. Which three statements describe the object-oriented features of the Java language? 

A. Objects cannot be reused. 

B. A subclass can inherit from a superclass. 

C. Objects can share behaviors with other objects. 

D. A package must contain more than one class. 

E. Object is the root class of all other objects. 

F. A main method must be declared in every class. 

Answer: B,C,E 


Q123. Given: 

What is the result? 

A. 3 4 5 6 

B. 3 4 3 6 

C. 5 4 5 6 

D. 3 6 4 6 

Answer:


Q124. Which two are valid array declaration? 

A. Object array[]; 

B. Boolean array[3]; 

C. int[] array; 

D. Float[2] array; 

Answer: A,C 


Q125. Given the code fragment: 

Which code fragment, when inserted at line 3, enables the code to print 10:20? 

A. int[] array n= new int[2]; 

B. int[] array; array = int[2]; 

C. int array = new int[2]; 

D. int array [2] ; 

Answer:


Improve 1z0-808 free download:

Q126. Which two actions will improve the encapsulation of a class? 

A. Changing the access modifier of a field from public to private 

B. Removing the public modifier from a class declaration 

C. Changing the return type of a method to void 

D. Returning a copy of the contents of an array or ArrayList instead of a direct reference 

Answer: A,D 

Reference: http://www.tutorialspoint.com/java/java_access_modifiers.htm 


Q127. Given the following class declarations: 

public abstract class Animal 

public interface Hunter 

public class Cat extends Animal implements Hunter 

public class Tiger extends Cat 

Which answer fails to compile? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

E. Option E 

Answer:

Explanation: Look at the right side of the declaration ArrayLIst() rather than ArrayList 


Q128. Given the code fragment: 

Which code fragment prints red: blue: small: medium? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer:


Q129. Given the code fragment: 

What is the result? 

A. [Robb, Rick, Bran] 

B. [Robb, Rick] 

C. [Robb, Bran, Rick, Bran] 

D. An exception is thrown at runtime. 

Answer:


Q130. Given: 

public class FieldInit { 

char c; 

boolean b; 

float f; 

void printAll() { 

System.out.println("c = " + c); 

System.out.println("c = " + b); 

System.out.println("c = " + f); 

public static void main(String[] args) { 

FieldInit f = new FieldInit(); 

f.printAll(); 

What is the result? 

A. c = null 

b = false 

f = 0.0F 

B. c = 0 

b = false 

f = 0.0f 

C. c = null 

b = true 

f = 0.0 

D. c = 

b = false 

f = 0.0 

Answer: