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Q11. Given: 

What is the result? 

A. John Adams George Washington Thomas Jefferson 

B. George Washington John Adams Thomas Jefferson 

C. Thomas Jefferson John Adams George Washington 

D. An exception is thrown at runtime 

E. Compilation fails 

Answer:

Explanation: The program compiles and runs fine. 

At runtime the NameList is built and then sorted by natural Order (String >> alphabetically). 


Q12. Given the following files in doc directory: -Index.htm 

-Service.html 

-Logo.gif 

-Title.jpg 

And the code fragment: 

What is the result, if doc is present in the current directory? 

A. No output is produced. 

B. index.htm 

C. index.htm userguide.txt logo.gif 

D. index.htm service.html userguide.txt logo.gif 

Answer:

Explanation: 

The Glob search expression is defined through "glob:*.htm, html, xml" The correct answer is A The glob is trying to match all the string. The correct way is 

glob:*.{htm,html,xml} 

and then would be found: 

Index.htm 

Service.html 


Q13. Which statement declares a generic class? 

A. public class Example < T > { } 

B. public class <Example> { } 

C. public class Example <> { } 

D. public class Example (Generic) { } 

E. public class Example (G) { } 

F. public class Example { } 

Answer:

Explanation: 

Example: 

public class Pocket<T> 

private T value; 

public Pocket() {} 

public Pocket( T value ) { this.value = value; } 

public void set( T value ) { this.value = value; } 

public T get() { return value; } 

public boolean isEmpty() { return value != null; } 

public void empty() { value = null; } 


Q14. Given the code fragment: 

What is the result, if the file salesreport.dat does not exist? 

A. Compilation fails only at line 6 

B. Compilation fails only at line 13 

C. Compilation fails at line 6 and 13 

D. Class java.io.IOException 

E. Class java.io.FileNotFoundException 

Answer:

Explanation: 

Compilation fails Line 13 : The resource br of a try-with-resources statement cannot be assignedresources are final in try-with-resources statements 


Q15. Given the fragment: 

Which two valid alternatives to line 3 would decouple this application from a specific implementation ofCustomerDAO? 

A. CustomerDAO custDao = CustomerDAO(); 

B. CustomerDAO custDao = (CustomerDAO) new Object (); 

C. CustomerDAO custDao = CustomerDAO.getInstance(); 

D. CustomerDAO custDao = (CustomerDAO) new CustomerDAOmemoryImp1(); 

E. CustomerDAO custDao = customerDAOFactory.getInstance(); 

Answer: C,E 

Explanation: 

Note: In software development, the term"decoupling"is used to identify the separation of software blocks thatshouldn't depend on each other. Some building blocks are generic and shouldn't know details of others. Special design techniques allow software designers to have as few dependencies as possible. This typicallyreduces the risk of malfunction in one part of a system when the other part changed. It also forces thedeveloper to focus on one thing at a time. Decoupling lowers or minimizes Coupling. 


Q16. Given the code fragment: SimpleDataFormat sdf; 

Which code fragment displays the three-character month abbreviation? 

A. SimpleDateFormat sdf = new SimpleDateFormat ("mm", Locale.UK); System.out.println 

("Result:" + 

sdf.format(new Date())); 

B. SimpleDateFormat sdf = new SimpleDateFormat ("MM", Locale.UK); System.out.println 

("Result:" + 

sdf.format(new Date())); 

C. SimpleDateFormat sdf = new SimpleDateFormat ("MMM", Locale.UK); 

System.out.println ("Result:" + 

sdf.format(new Date())); 

D. SimpleDateFormat sdf = new SimpleDateFormat ("MMMM", Locale.UK); 

System.out.println ("Result:" + 

sdf.format(new Date())); 

Answer:


Q17. Given: 

What is the result? 

A. peach orange apple 

B. peach orange 

C. apple orange 

D. The program does not compile. 

E. The program generates an exception at runtime. 

Answer:

Explanation: 

int compare(T obj1, T obj2) 0 if equal positive if obj1 greater negative if obj2 greater The compiler has a problem with the line: public boolean compare(String s1, String s2) { return s1.length() > s2.length(); error: <anonymous comparetest.CompareTest$1> is not abstract and does not override abstract method compare(String,String) in Comparator 

new Comparator<String>() { 

Error: compare(String,String) in <anonymous comparetest.CompareTest$1> cannot 

implement compare(T,T) 

in Comparator 

public boolean compare(String s1, String s2) { 

return type boolean is not compatible with int 

where T is a type-variable: 

T extends Object declared in interface Comparator 


Q18. Given: 

And the command-line invocation: 

Java Tracker 12 11 

What is the result? 

A. General category 

B. class InvalidAgeException 

C. class java.lang.IllegalArgumentException 

D. class java.lang.RuntimeException 

Answer:

Explanation: 

The second argument 11 makes the program to throw an InvalidAgeException due to the 

line: 

if (age < 12) 

throw new InvalidAgeException (); 


Q19. Given: 

Which two are true? 

A. Thread is printed 

B. Runnable is printed 

C. No output is produced 

D. No new threads of execution are started within the main method 

E. One new thread of execution is started within the main method 

F. Two new threads of exclusion are started within the main method 

Answer: C,D 


Q20. Which two are true about Singletons? 

A. A Singleton must implement serializable. 

B. A Singleton has only the default constructor. 

C. A Singleton implements a factory method. 

D. A Singleton improves a class's cohesion. 

E. Singletons can be designed to be thread-safe. 

Answer: C,E