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Q111. Given the code fragment:
class Student {
int rollnumber;
String name;
List cources = new ArrayList();
// insert code here
public String toString() {
return rollnumber + " : " + name + " : " + cources;
}
}
And,
public class Test {
public static void main(String[] args) {
List cs = newArrayList();
cs.add("Java");
cs.add("C");
Student s = new Student(123,"Fred", cs);
System.out.println(s);
}
}
Which code fragment, when inserted at line // insert code here, enables class Test to print 123 : Fred : [Java, C]?
A.
private Student(int i, String name, List cs) {
/* initialization code goes here */
}
B.
public void Student(int i, String name, List cs) {
/* initialization code goes here */
}
C.
Student(int i, String name, List cs) {
/* initialization code goes here */
}
D.
Student(int i, String name, ArrayList cs) {
/* initialization code goes here */
}
Answer: C
Explanation:
Incorrect:
Not A: Student has private access line: Student s = new Student(123,"Fred", cs);
Not D: Cannot be applied to given types. Line: Student s = new Student(123,"Fred", cs);
Q112. Given:
A. Ym Xm2
B. Ym Xm1
C. Compilation fails
D. A ClassCastException is thrown at runtime
Answer: B
Q113. Given:
package p1;
public class Test {
static double dvalue;
static Test ref;
public static void main(String[] args) {
System.out.println(ref);
System.out.println(dvalue);
}
}
What is the result?
A. p1.Test.class
0.0
B. <the summary address refrenced by ref> 0.000000
C. Null
0.0
D. Compilation fails
E. A NullPointerException is thrown at runtime
Answer: C
Q114. Given:
What is the result?
A. 1
1
1
B. 1
2
3
C. 2
3
4
D. Compilation fails
E. The loop executes infinite times
Answer: E
Q115. Given:
What is the result?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: B
Q116. Given the code fragment:
What is the result?
A. true true
B. true false
C. false false
D. false true
Answer: C
Q117. Given the code fragment:
Which two modifications, made independently, enable the code to compile?
A. Make the method at line n1 public.
B. Make the method at line n2 public.
C. Make the method at line n3 public.
D. Make the method at line n3 protected.
E. Make the method at line n4 public.
Answer: C,D
Q118. Which statement is/are true?
I. Default constructor only contains "super();" call.
II. We can't use any access modifier with a constructor.
III. A constructor should not have a return type.
A. Only I.
B. Only II.
C. Only I and II.
D. Only I and III.
E. AIL
Answer: D
Explanation:
Statement I is correct as the default constructor only contains super0 call
Statement II is incorrect as we can use any access modifier with a constructor.
Statement III is correct as constructor can't have return type, even void.
So option D is correct.
httpsy/docs.oracle.com/javase/tutorial/iava/javaOO/construaors.html
Q119. Given:
What is the result?
A. 400 200
B. 200 200
C. 400 400
D. Compilation fails.
Answer: A
Q120. Given:
What is the result?
A. Null
B. Compilation fails
C. An exception is thrown at runtime
D. 0
Answer: C
