QUESTION NO: 1
Given the class definitions:
class C1 {}
class C2 extends C1 {}
class C3 extends C2 {}
and the code fragment:
16. C1 obj1 = (C1) new C2();
17. C2 obj2 = (C2) new C3();
18. C2 obj3 = (C2) new C1();
19. C3 obj4 = (C3) obj2;
Which line throws ClassCastException?
Given the class definitions:
class C1 {}
class C2 extends C1 {}
class C3 extends C2 {}
and the code fragment:
16. C1 obj1 = (C1) new C2();
17. C2 obj2 = (C2) new C3();
18. C2 obj3 = (C2) new C1();
19. C3 obj4 = (C3) obj2;
Which line throws ClassCastException?
Correct Answer: C
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QUESTION NO: 2
Which statement will emoty the contents of a StringBuilder variable named sb?
Which statement will emoty the contents of a StringBuilder variable named sb?
Correct Answer: B
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QUESTION NO: 4
Given:
public class ComputeSum {
public int x;
public int y;
public int sum;
public ComputeSum (int nx, int ny) {
x = nx; y =ny;
updateSum();
}
public void setX(int nx) { x = nx; updateSum();}
public void setY(int ny) { x = ny; updateSum();}
void updateSum() { sum = x + y;}
}
This class needs to protect an invariant on the sum field.
Which three members must have the private access modifier to ensure that this invariant is maintained?
Given:
public class ComputeSum {
public int x;
public int y;
public int sum;
public ComputeSum (int nx, int ny) {
x = nx; y =ny;
updateSum();
}
public void setX(int nx) { x = nx; updateSum();}
public void setY(int ny) { x = ny; updateSum();}
void updateSum() { sum = x + y;}
}
This class needs to protect an invariant on the sum field.
Which three members must have the private access modifier to ensure that this invariant is maintained?
Correct Answer: A,C,D
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QUESTION NO: 5
Given the code fragment:
String[] cartoons = {"tom","jerry","micky","tom"};
int counter =0;
if ("tom".equals(cartoons[0])) {
counter++;
} else if ("tom".equals(cartoons[1])) {
counter++;
} else if ("tom".equals(cartoons[2])) {
counter++;
} else if ("tom".equals(cartoons[3])) {
counter++;
}
System.out.print(counter);
What is the result?
Given the code fragment:
String[] cartoons = {"tom","jerry","micky","tom"};
int counter =0;
if ("tom".equals(cartoons[0])) {
counter++;
} else if ("tom".equals(cartoons[1])) {
counter++;
} else if ("tom".equals(cartoons[2])) {
counter++;
} else if ("tom".equals(cartoons[3])) {
counter++;
}
System.out.print(counter);
What is the result?
Correct Answer: B
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QUESTION NO: 6
Given:
What is the result?
Given:
What is the result?
Correct Answer: E
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QUESTION NO: 7
View the exhibit.
Given the code fragment:
Which change enables the code to print the following?
James age: 20
Williams age: 32
View the exhibit.
Given the code fragment:
Which change enables the code to print the following?
James age: 20
Williams age: 32
Correct Answer: C
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QUESTION NO: 8
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.
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.
Correct Answer: A
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QUESTION NO: 10
Given the code fragment:
String h1 = "Bob";
String h2 = new String ("Bob");
What is the best way to test that the values of h1 and h2 are the same?
Given the code fragment:
String h1 = "Bob";
String h2 = new String ("Bob");
What is the best way to test that the values of h1 and h2 are the same?
Correct Answer: D
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QUESTION NO: 11
What is the proper way to defined a method that take two int values and returns their sum as an int value?
What is the proper way to defined a method that take two int values and returns their sum as an int value?
Correct Answer: C
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QUESTION NO: 12
Given the class definitions:
And the code fragment of the main() method,
What is the result?
Given the class definitions:
And the code fragment of the main() method,
What is the result?
Correct Answer: B
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QUESTION NO: 13
Which two statements are true about Java byte code? (Choose two.)
Which two statements are true about Java byte code? (Choose two.)
Correct Answer: A,D
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QUESTION NO: 14
Given the code fragment:
public class ForTest {
public static void main(String[] args) {
int[] array = {1, 2, 3};
for ( foo ) {
}
}
Which three code fragments, when replaced individually for foo, enables the program to compile?
Given the code fragment:
public class ForTest {
public static void main(String[] args) {
int[] array = {1, 2, 3};
for ( foo ) {
}
}
Which three code fragments, when replaced individually for foo, enables the program to compile?
Correct Answer: B,C,E
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