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Q121. You are developing a banking module. You have developed a class named ccMask that has a maskcc method.
Given the code fragment:
You must ensure that the maskcc method returns a string that hides all digits of the credit card number except the four last digits (and the hyphens that separate each group of four digits).
Which two code fragments should you use at line n1, independently, to achieve this requirement?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: B,C
Q122. Given:
What is the result?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: B
Q123. Given:
What is the result?
A. 200.0 : 100.0
B. 400.0 : 200.0
C. 400.0 : 100.0
D. Compilation fails.
Answer: C
Q124. Which two are valid array declaration?
A. Object array[];
B. Boolean array[3];
C. int[] array;
D. Float[2] array;
Answer: A,C
Q125. Given:
What is the result?
A. 2 4 6 8 10 12
B. 2 4 6 8 10 12 14
C. Compilation fails
D. The program prints multiple of 2 infinite times
E. The program prints nothing
Answer: B
Q126. 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
Q127. int i, j=0;
i = (3* 2 +4 +5 ) ;
j = (3 * ((2+4) + 5));
System.out.println("i:"+ i + "\nj":+j);
What is the result?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: B
Q128. Given:
public class TestLoop1 {
public static void main(String[] args) {
int a = 0, z=10;
while (a < z) {
a++;
--z;
} System.out.print(a + " : " + z); } }
What is the result?
A. 5 : 5
B. 6 : 4
C. 6 : 5
D. 5 : 4
Answer: A
Q129. Which statement will empty the contents of a StringBuilder variable named sb?
A. sb.deleteAll();
B. sb.delete(0, sb.size());
C. sb.delete(0, sb.length());
D. sb.removeAll();
Answer: C
Q130. Given:
What is the result?
A. Area is 6.0
B. Area is 3.0
C. Compilation fails at line n1
D. Compilation fails at line n2.
Answer: D