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Q21. Given: 

public class X { 

static int i; 

int j; 

public static void main(String[] args) { 

X x1 = new X(); 

X x2 = new X(); 

x1.i = 3; 

x1.j = 4; 

x2.i = 5; 

x2.j = 6; 

System.out.println( 

x1.i + " "+ 

x1.j + " "+ 

x2.i + " "+ 

x2.j); 

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:


Q22. Given: 

What is the result? 

A. Marrown 

String out of limits 

JesOran 

B. Marrown 

String out of limits 

Array out of limits 

C. Marrown 

String out of limits 

D. Marrown 

NanRed 

JesOran 

Answer:


Q23. Given the fragment: 

What is the result? 

A. 13480.0 

B. 13480.02 

C. Compilation fails 

D. An exception is thrown at runtime 

Answer:


Q24. Given: 

What is the result? 

A. Compilation fails 

B. The code compiles, but does not execute. 

C. Paildrome 

D. Wow 

E. Mom 

Answer:


Q25. Which two statements are true for a two-dimensional array of primitive data type? 

A. It cannot contain elements of different types. 

B. The length of each dimension must be the same. 

C. At the 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: C,D 

Explanation: http://stackoverflow.com/questions/12806739/is-an-array-a-primitive-type-or-an-object-or-something-else-entirely 


Q26. Which two are benefits of polymorphism? 

A. Faster code at runtime 

B. More efficient code at runtime 

C. More dynamic code at runtime 

D. More flexible and reusable code 

E. Code that is protected from extension by other classes 

Answer: C,D 


Q27. 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 


Q28. View the exhibit: 

public class Student { 

public String name = ""; 

public int age = 0; 

public String major = "Undeclared"; 

public boolean fulltime = true; 

public void display() { 

System.out.println("Name: " + name + " Major: " + major); } 

public boolean isFullTime() { 

return fulltime; 

Which line of code initializes a student instance? 

A. Student student1; 

B. Student student1 = Student.new(); 

C. Student student1 = new Student(); 

D. Student student1 = Student(); 

Answer:


Q29. Given the following two classes: 

How should you write methods in the ElectricAccount class at line n1 so that the member variable bill is always equal to the value of the member variable kwh multiplied by the member variable rate? 

Any amount of electricity used by a customer (represented by an instance of the customer class) must contribute to the customer's bill (represented by the member variable bill) through the method useElectricity method. An instance of the customer class should never be able to tamper with or decrease the value of the member variable bill. 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer:


Q30. Given the classes: 

* AssertionError 

* ArithmeticException 

* ArrayIndexOutofBoundsException 

* FileNotFoundException 

* IllegalArgumentException 

* IOError 

* IOException 

* NumberFormatException 

* SQLException 

Which option lists only those classes that belong to the unchecked exception category? 

A. AssertionError, ArrayIndexOutOfBoundsException, ArithmeticException 

B. AssertionError, IOError, IOException 

C. ArithmeticException, FileNotFoundException, NumberFormatException 

D. FileNotFoundException, IOException, SQLException 

E. ArrayIndexOutOfBoundException, IllegalArgumentException, FileNotFoundException 

Answer:

Explanation: Not B: IOError and IOException are both checked errors. 

Not C, not D, not E: FileNotFoundException is a checked error. 

Note: 

Checked exceptions: 

* represent invalid conditions in areas outside the immediate control of the program (invalid user input, database problems, network outages, absent files) 

* are subclasses of Exception 

* a method is obliged to establish a policy for all checked exceptions thrown by its implementation (either pass the checked exception further up the stack, or handle it 

somehow) 

Note: 

Unchecked exceptions: 

* represent defects in the program (bugs) - often invalid arguments passed to a non-private method. To quote from The Java Programming Language, by Gosling, Arnold, and Holmes: "Unchecked runtime exceptions represent conditions that, generally speaking, reflect errors in your program's logic and cannot be reasonably recovered from at run time." 

* are subclasses of RuntimeException, and are usually implemented using IllegalArgumentException, NullPointerException, or IllegalStateException 

* method is not obliged to establish a policy for the unchecked exceptions thrown by its implementation (and they almost always do not do so)