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2016 Oct 1Z0-809 practice exam

Q81. Given: 

class Bird { 

public void fly () { System.out.print(“Can fly”); } 

class Penguin extends Bird { 

public void fly () { System.out.print(“Cannot fly”); } 

and the code fragment: 

class Birdie { 

public static void main (String [ ] args) { 

fly( ( ) -> new Bird ( )); 

fly (Penguin : : new); 

/* line n1 */ 

Which code fragment, when inserted at line n1, enables the Birdie class to compile? 

A. static void fly (Consumer<Bird> bird) { 

bird :: fly (); } 

B. static void fly (Consumer<? extends Bird> bird) { 

bird.accept( ) fly (); 

C. static void fly (Supplier<Bird> bird) { 

bird.get( ) fly (); 

D. static void fly (Supplier<? extends Bird> bird) { 

LOST 

Answer:

Explanation: NOTE: Very confusing question. There is no logic in the options. 


Q82. Given: 

class Student { 

String course, name, city; 

public Student (String name, String course, String city) { 

this.course = course; this.name = name; this.city = city; 

public String toString() { 

return course + “:” + name + “:” + city; 

and the code fragment: 

List<Student> stds = Arrays.asList( 

new Student (“Jessy”, “Java ME”, “Chicago”), 

new Student (“Helen”, “Java EE”, “Houston”), 

new Student (“Mark”, “Java ME”, “Chicago”)); 

stds.stream() 

.collect(Collectors.groupingBy(Student::getCourse)) 

.forEach(src, res) -> System.out.println(scr)); 

What is the result? 

A. [Java EE: Helen:Houston] 

[Java ME: Jessy:Chicago, Java ME: Mark:Chicago] 

B. Java EE 

Java ME 

C. [Java ME: Jessy:Chicago, Java ME: Mark:Chicago] 

[Java EE: Helen:Houston] 

D. A compilation error occurs. 

Answer:


Q83. Which two statements are true for a two-dimensional array? 

A. It is implemented as an array of the specified element type. 

B. Using a row by column convention, each row of a two-dimensional array must be of the same size. 

C. At declaration time, the number of elements of the array in each dimension must be specified. 

D. All methods of the class Object may be invoked on the two-dimensional array. 

Answer: A,D 


Q84. Given: 

What is the result? 

A. Null 

B. Compilation fails 

C. An exception is thrown at runtime 

D. 0 

Answer:


Far out 1Z0-809 free practice questions:

Q85. A method is declared to take three arguments. A program calls this method and passes only two arguments. What is the results? 

A. Compilation fails. 

B. The third argument is given the value null. 

C. The third argument is given the value void. 

D. The third argument is given the value zero. 

E. The third argument is given the appropriate falsy value for its declared type. F) An exception occurs when the method attempts to access the third argument. 

Answer:


Q86. Given: 

interface Doable { 

public void doSomething (String s); 

Which two class definitions compile? 

A. public abstract class Task implements Doable { 

public void doSomethingElse(String s) { } 

B. public abstract class Work implements Doable { 

public abstract void doSomething(String s) { } 

public void doYourThing(Boolean b) { } 

C. public class Job implements Doable { 

public void doSomething(Integer i) { } 

D. public class Action implements Doable { 

public void doSomething(Integer i) { } 

public String doThis(Integer j) { } 

E. public class Do implements Doable { 

public void doSomething(Integer i) { } 

public void doSomething(String s) { } 

public void doThat (String s) { } 

Answer: C,D 


Q87. public class ForTest { 

public static void main(String[] args) { 

int[] arrar = {1,2,3}; 

for ( foo ) { 

Which three are valid replacements for foo so that the program will compiled and run? 

A. int i: array 

B. int i = 0; i < 1; i++ 

C. ;; 

D. ; i < 1; i++ 

E. ; i < 1; 

Answer: A,B,C 


Q88. Given the code fragments: 

What is the result? 

A. Super Sub Sub 

B. Contract Contract Super 

C. Compilation fails at line n1 

D. Compilation fails at line n2 

Answer:


Q89. 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. 



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