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Q11. Given the code fragment: 

What is the result if the integer aVar is 9? 

A. 10 Hello world! 

B. 10 Hello universe! 

C. 9 Hello world! 

D. Compilation fails. 

Answer:


Q12. 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. 


Q13. Given the fragment: 

What is the result? 

A. 13480.0 

B. 13480.02 

C. Compilation fails 

D. An exception is thrown at runtime 

Answer:


Q14. Given: 

What is the result? 

A. simaple A 

B. Capital A 

C. simaple A default Capital A 

D. simaple A default 

E. Compilation fails. 

Answer:

Explanation: 

Here we have to use two ternary operators combined. SO first we can use to check first 

condition which is x > 10, as follows; 

x>10?">": (when condition false) Now we have to use another to check if x<10 as follows; 

x<10?V:"=" We can combine these two by putting last ternary statement in the false 

position of first ternary statement as follows; 

x>10?">":x<10?'<':"=" 

https;//docs.oraclexom/javase/tutorial/java/nutsandbolts/if.html 


Q15. Given the code from the Greeting.Java file: 

Which set of commands prints Hello Duke in the console? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer:


Q16. Given: 

And given the code fragment: 

What is the result? 

A. 4W 100 Auto 4W 150 Manual 

B. Null 0 Auto 4W 150 Manual 

C. Compilation fails only at line n1 

D. Compilation fails only at line n2 

E. Compilation fails at both line n1 and line n2 

Answer:

Explanation: 

On line n1 implicit call to parameterized constructor is missing and n2 this() must be the first line. 


Q17. Which two are valid array declaration? 

A. Object array[]; 

B. Boolean array[3]; 

C. int[] array; 

D. Float[2] array; 

Answer: A,C 


Q18. Given: 

class Base { 

// insert code here 

public class Derived extends Base{ 

public static void main(String[] args) { 

Derived obj = new Derived(); 

obj.setNum(3); 

System.out.println("Square = " + obj.getNum() * obj.getNum()); 

Which two options, when inserted independently inside class Base, ensure that the class is being properly encapsulated and allow the program to execute and print the square of the number? 

A. private int num; public int getNum() { return num; }public void setNum(int num) { this.num = num;} 

B. public int num; protected public int getNum() { return num; }protected public void setNum(int num) { this.num = num;} 

C. private int num;public int getNum() {return num;} private void setNum(int num) { this.num = num;} 

D. protected int num; public int getNum() { return num; } public void setNum(int num) { this.num = num;} 

E. protected int num; private int getNum() { return num; } public void setNum(int num) { this.num = num;} 

Answer: A,D 

Explanation: 

Incorrect: 

Not B: illegal combination of modifiers: protected and public 

not C: setNum method cannot be private. 

not E: getNum method cannot be private. 


Q19. Given: 

What is the result? 

A. 11, 21, 31, 11, 21, 31 

B. 11, 21, 31, 12, 22, 32 

C. 12, 22, 32, 12, 22, 32 

D. 10, 20, 30, 10, 20, 30 

Answer:


Q20. 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