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Q31. Given:
Which three lines will compile and output “right on!”?
A. Line 5
B. Line 6
C. Line 7
D. Line 8
E. Line 9
F. Line 10
Answer: CDF
Q32. Given:
What three modifications are necessary to ensure that the class is being properly encapsulated?
This class is poorly encapsulated. You need to change the circle class to compute and return the area instead.
A. Change the access modifier of the setradius () method to private
B. Change the getArea () method public double getArea () { return area; }
C. When the radius is set in the Circle constructor and the setRadius () method, recomputed the area and store it into the area field
D. Change the getRadius () method:
public double getRadius () {
area = Math.PI * radius * radius;
return radius;
}
Answer: BCD
Q33. Given:
What is the result?
A. Red 0
Orange 0
Green 3
B. Red 0
Orange 0
Green 6
C. Red 0
Orange 1
D. Green 4
E. Compilation fails
Answer: E
Q34. Given the fragments:
Which line causes a compilation error?
A. Line n1
B. Line n2
C. Line n3
D. Line n4
Answer: A
Q35. What is the result when this program is executed?
A. Bob's Name: Bob
B. Bob's Name: Jian
C. Nothing prints
D. Bob’s name
Answer: B
Q36. Which two are valid array declaration?
A. Object array[];
B. Boolean array[3];
C. int[] array;
D. Float[2] array;
Answer: AC
Q37. Give:
What is the result?
A. 1525
B. 13
C. Compilation fails
D. An exception is thrown at runtime
E. The program fails to execute due to runtime error
Answer: D
Q38. Which code fragment cause a compilation error?
A. flat flt = 100F;
B. float flt = (float) 1_11.00;
C. float flt = 100;
D. double y1 = 203.22; floatflt = y1
E. int y2 = 100; floatflt = (float) y2;
Answer: B
Q39. Given the code fragment:
Boolean b1 = true;
Boolean b2 = false;
int i = 0;
while (foo) { }
Which one is valid as a replacement for foo?
A. b1.compareTo(b2)
B. i = 1
C. i == 2? -1 : 0
D. "foo".equals("bar")
Answer: D
Q40. Give:
What value should replace kk in line x to cause jj = 5 to be output?
A. -1
B. 1
C. 5
D. 8
E. 11
Answer: E