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Q21. Given the code fragment: 

public static void main(String[] args) { 

int iArray[] = {65, 68, 69}; 

iArray[2] = iArray[0]; 

iArray[0] = iArray[1]; 

iArray[1] = iArray[2]; 

for (int element : iArray) { 

System.out.print(element + " "); 

A. 68, 65, 69 

B. 68, 65, 65 

C. 65, 68, 65 

D. 65, 68, 69 

E. Compilation fails 

Answer:

Q22. Given: 

What is the result? 

A. Red 0 

Orange 0 

Green 3 

B. Red 0 

Orange 0 

Green 6 

C. Red 0 

Orange 1 

D. Green 4 

E. Compilation fails 

Answer:

Q23. Which three are advantages of the Java exception mechanism? 

A. Improves the program structure because the error handling code is separated from the normal program function 

B. Provides a set of standard exceptions that covers all the possible errors 

C. Improves the program structure because the programmer can choose where to handle exceptions 

D. Improves the program structure because exceptions must be handled in the method in which they occurred 

E. Allows the creation of new exceptions that are tailored to the particular program being created 

Answer: A,C,E 

Q24. Given: 

public class Test { 

public static void main(String[] args) { 

try { 

String[] arr =new String[4]; 

arr[1] = "Unix"; 

arr[2] = "Linux"; 

arr[3] = "Solarios"; 

for (String var : arr) { 

System.out.print(var + " "); 

} catch(Exception e) { 

System.out.print (e.getClass()); 

What is the result? 

A. Unix Linux Solaris 

B. Null Unix Linux Solaris 

C. Class java.lang.Exception 

D. Class java.lang.NullPointerException 

Answer:

Explanation: null Unix Linux Solarios 

The first element, arr[0], has not been defined. 

Q25. Given: 

Which of the following is equivalent to the above code fragment? 

A. System.out.printLn(x>10?">,': "<":,'="); 

B. System.out.println(x>10? ">"?"<":"="); 

C. System.out.println(x>10?">":x<10?"<":"="); 

D. System.out.printLn(x>10?">"?,'<"?"="); 

E. None of the above 

Answer:

Explanation: 

Option A is incorrect as we can't use abstract with non abstract method, (here method has method body.) Option C is incorrect as when overriding method we can't use more restrictive access modifier, so trying to use private to override default access Level method causes a compile time error. Option D is incorrect as default methods (not methods with default access level) are allowed only in interfaces. Option E is incorrect as method all ready has void as return type, so we can't add int there. Option B is correct as we can use final there, since the method is non abstract 

https://docs.oracle.com/javase/tutorial/java/landl/polymorphism.html 

Q26. Given the code fragment: 

Which two modifications, when made independently, enable the code to print joe:true: 100.0? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

E. Option E 

Answer: A,C 

Q27. Given: 

public class ScopeTest { 

int j, int k; 

public static void main(String[] args) { 

ew ScopeTest().doStuff(); } 

void doStuff() { 

nt x = 5; 

oStuff2(); 

System.out.println("x"); 

void doStuff2() { 

nt y = 7; 

ystem.out.println("y"); 

or (int z = 0; z < 5; z++) { 

ystem.out.println("z"); 

ystem.out.println("y"); 

Which two items are fields? 

A. j 

B. k 

C. x 

D. y 

E. z 

Answer: A,B 

Q28. Given the code fragment: 

int b = 3; 

if ( !(b > 3)) { 

System.out.println("square "); 

}{ 

System.out.println("circle "); 

System.out.println("…"); 

What is the result? 

A. square… 

B. circle… 

C. squarecircle… 

D. Compilation fails. 

Answer:

Q29. 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 

Q30. Given: 

What is the result? 

A. Shining Sun Shining Sun Shining Sun 

B. Shining Sun Twinkling Star Shining Sun 

C. Compilation fails 

D. A ClassCastException is thrown at runtime 

Answer:

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