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Q71. Given the following array:
Which two code fragments, independently, print each element in this array?
A. Option A
B. Option B
C. Option C
D. Option D
E. Option E
F. Option F
Answer: B,E
Explanation: All the remaining options have syntax errors
Q72. Given:
What is the result?
A. myStr: 9009, myNum: 9009
B. myStr: 7007, myNum: 7007
C. myStr: 7007, myNum: 9009
D. Compilation fails
Answer: C
Q73. Given:
What is the result?
A. Good Day! Good Luck!
B. Good Day! Good Day!
C. Good Luck! Good Day!
D. Good Luck! Good Luck!
E. Compilation fails
Answer: E
Q74. 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
Q75. Given the code fragment:
Which statement is true?
A. After line 8, three objects are eligible for garbage collection
B. After line 8, two objects are eligible for garbage collection
C. After line 8, one object is eligible for garbage collection
D. After line 8, none of the objects are eligible for garbage collection
Answer: C
Q76. Given:
What is the result?
A. 97 98 99 100 null null null
B. 91 98 99 100 101 102 103
C. Compilation rails.
D. A NullPointerException is thrown at runtime.
E. An ArraylndexOutOfBoundsException is thrown at runtime.
Answer: A
Q77. Given:
Which inserted at line 11, will provide the following output?
[21, 15, 11]
A. list.removelf(e > e%2 != 0);
B. list.removelf(e -> e%2 != 0);
C. Ust.removelf(e -> e%2 = 0);
D. list.remove(e -> e%2 = 0);
E. None of the above.
Answer: C
Explanation:
In output we can see that only odd numbers present, so we need to remove only even numbers to get expected output. From Java SE 8, there is new method call removelf which takes predicate object and remove elements which satisfies predicate condition. Predicate has functional method call take object and check if the given condition met or not, if met it returns true, otherwise false. Option C we have passed correct lambda expression to check whether the number is odd or even that matches to the functional method of predicate interface. Option A is incorrect as it is invalid lambda expression. Option B is incorrect as it removes all odd numbers. Option D is incorrect as there is no remove method that takes predicate as argument. https://docs.oracle.eom/javase/8/docs/api/java/util/ArrayList.html
Q78. Given:
class Sports {
int num_players;
String name, ground_condition;
Sports(int np, String sname, String sground){
num_players = np;
name = sname;
ground_condition = sground;
}
}
class Cricket extends Sports {
int num_umpires;
int num_substitutes;
Which code fragment can be inserted at line //insert code here to enable the code to compile?
A. Cricket() {
super(11, "Cricket", "Condidtion OK");
num_umpires =3;
num_substitutes=2;
}
B. Cricket() {
super.ground_condition = "Condition OK";
super.name="Cricket";
super.num_players = 11;
num_umpires =3;
num_substitutes=2;
}
C. Cricket() {
this(3,2);
super(11, "Cricket", "Condidtion OK");
}
Cricket(int nu, ns) {
this.num_umpires =nu;
this.num_substitutes=ns;
}
D. Cricket() {
this.num_umpires =3;
this.num_substitutes=2;
super(11, "Cricket", "Condidtion OK");
}
Answer: A
Explanation:
Incorrect:
not C, not D: call to super must be the first statement in constructor.
Q79. Given:
What is the result?
A. 120
B. 120D
C. A NumberFormatException will be thrown.
D. Compilation fails due to error at line 5.
E. Compilation tails due to error at line 8.
Answer: E
Explanation:
At line 5, we have created a wrapper object of double by passing 120D, which is convertible to a Double, so there won't be any exception there. But if you check carefully, you can see the variable number is declared inside try block, so the scope of the variable number is limited to that block, so trying to access it outside causes a compile time error. httpsy/docs.oracle.com/javase/tutorial/iava/nutsandbolts/variables.html
Q80. Given:
public class Test {
static boolean bVar;
public static void main(String[] args) {
boolean bVar1 = true;
int count =8;
do {
System.out.println("Hello Java! " +count);
if (count >= 7) {
bVar1 = false;
}
} while (bVar != bVar1 && count > 4);
count -= 2;
}
}
What is the result?
A. Hello Java! 8 Hello Java! 6 Hello Java! 4
B. Hello Java! 8 Hello Java! 6
C. Hello Java! 8
D. Compilation fails
Answer: C
Explanation: Hello Java! 8