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Q91. Given the fragments:
Which line causes a compilation error?
A. Line n1
B. Line n2
C. Line n3
D. Line n4
Answer: A
Q92. Given:
Which code fragment, when inserted at line 9, enables the code to print true?
A. String str2 = str1;
B. String str2 = new string (str1);
C. String str2 = sb1.toString();
D. String str2 = “Duke”;
Answer: B
Q93. What is the proper way to defined a method that take two int values and returns their sum as an int value?
A. int sum(int first, int second) { first + second; }
B. int sum(int first, second) { return first + second; }
C. sum(int first, int second) { return first + second; }
D. int sum(int first, int second) { return first + second; }
E. void sum (int first, int second) { return first + second; }
Answer: D
Q94. Given:
Which two classes use the shape class correctly?
A. Option A
B. Option B
C. Option C
D. Option D
E. Option E
F. Option F
Answer: B,E
Explanation: When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class (E). 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.
Q95. Given:
A. a, e
i, o
B. a, e
o, o
C. e, e
I, o
D. e, e
o, o
Answer: B
Q96. Given:
What is the result?
A. A B C D
B. A C D
C. A B C
D. A B D
E. A B D C
Answer: C
Q97. 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
Q98. Given:
class MarksOutOfBoundsException extends IndexOutOfBoundsException { }
public class GradingProcess {
void verify(int marks) throws IndexOutOfBoundsException {
if (marks > 100) {
throw new MarksOutOfBoundsException();
}
if (marks > 50) {
System.out.print("Pass");
} else {
System.out.print("Fail");
}
}
public static void main(String[] args) {
int marks = Integer.parseInt(args[2]);
try {
new GradingProcess().verify(marks));
} catch(Exception e) {
System.out.print(e.getClass()); } } }
And the command line invocation:
Java grading process 89 50 104
What is the result?
A. Pass
B. Fail
C. Class MarketOutOfBoundsException
D. Class IndexOutOfBoundsException
E. Class Exception
Answer: C
Explanation: The value 104 will cause a MarketOutOfBoundsException
Q99. Given:
What is the result?
A. 10 20 30 40
B. 0 0 30 40
C. Compilation fails
D. An exception is thrown at runtime
Answer: A
Q100. Which usage represents a valid way of compiling java source file with the name "Main"?
A. javac Main.java
B. java Main.class
C. java Main.java
D. javac Main
E. java Main
Answer: A
Explanation: The compiler is invoked by the javac command. When compiling a Java class, you must include the file name, which houses the main classes including the Java extension. So to run Main.java file we have to use command in option A. TO execute Java program we can use Java command but can't use it for compiling. https://docs.oracle.com/javase/tutorial/getStarted/application/index.html
