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Q101. Given the code fragment: 

What is the result? 

A. May 04, 2014T00:00:00.000 

B. 2014-05-04T00:00: 00. 000 

C. 5/4/14T00:00:00.000 

D. An exception is thrown at runtime. 

Answer:

Explanation: 

java.time.temporal.UnsupportedTemporalTypeException: Unsupported field: HourOfDay 


Q102. Given: 

The class is poorly encapsulated. You need to change the circle class to compute and return the area instead. 

Which two modifications are necessary to ensure that the class is being properly encapsulated? 

A. Remove the area field. 

B. Change the getArea( ) method as follows: 

public double getArea ( ) { return Match.PI * radius * radius; } 

C. Add the following method: 

public double getArea ( ) {area = Match.PI * radius * radius; } 

D. Change the cacess modifier of the SerRadius ( ) method to be protected. 

Answer: B,D 


Q103. Given: 

A. Ym Xm2 

B. Ym Xm1 

C. Compilation fails 

D. A ClassCastException is thrown at runtime 

Answer:


Q104. Given: 

public class MyClass { 

public static void main(String[] args) { 

String s = " Java Duke "; 

int len = s.trim().length(); 

System.out.print(len); 

What is the result? 

A. 8 

B. 9 

C. 11 

D. 10 

E. Compilation fails 

Answer:

Explanation: Java - String trim() Method 

This method returns a copy of the string, with leading and trailing whitespace omitted. 


Q105. Given the code fragment from three files: 

Which code fragment, when inserted at line 2, enables the code to compile? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

E. Option E 

Answer:


Q106. Given: 

public class String1 { 

public static void main(String[] args) { 

String s = "123"; 

if (s.length() >2) 

s.concat("456"); 

for(int x = 0; x <3; x++) 

s += "x"; 

System.out.println(s); 

What is the result? 

A. 123 

B. 123xxx 

C. 123456 

D. 123456xxx 

E. Compilation fails 

Answer:

Explanation: 123xxx 

The if clause is not applied. 

Note: Syntax of if-statement: 

if ( Statement ) { 


Q107. Given: 

What is the result? 

A. true true 

B. true false 

C. false true 

D. false false 

E. Compilation fails 

Answer:


Q108. Given: 

Which two code fragments are valid? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

E. Option E 

Answer: B,C 

Explanation: When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class (C). 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. 


Q109. 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) 


Q110. Given: 

What is the result? 

A. Null 

B. Compilation fails 

C. An exception is thrown at runtime 

D. 0 

Answer: