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Q51. boolean log3 = ( 5.0 != 6.0) && ( 4 != 5);
boolean log4 = (4 != 4) || (4 == 4);
System.out.println("log3:"+ log3 + \nlog4" + log4);
What is the result?
A. log3:false log4:true
B. log3:true log4:true
C. log3:true log4:false
D. log3:false log4:false
Answer: B
Q52. Given:
What will be the output?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: D
Q53. Which two items can legally be contained within a java class declaration?
A. An import statement
B. A field declaration
C. A package declaration
D. A method declaration
Answer: BD
Q54. Which two are valid declarations of a two-dimensional array?
A. int [] [] array2D;
B. int [2] [2] array2D;
C. int array2D [];
D. int [] array2D [];
E. int [] [] array2D [];
Answer: AD
Q55. Given:
What is the result?
A. One
B. Two
C. Three
D. Compilation fails
Answer: D
Q56. Given:
Which code fragment, when inserted at line 7, enables the code print true?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: A
Q57. 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
Q58. 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
Q59. Given:
Class A { }
Class B { }
Interface X { }
Interface Y { }
Which two definitions of class C are valid?
A. Class C extends A implements X { }
B. Class C implements Y extends B { }
C. Class C extends A, B { }
D. Class C implements X, Y extends B { }
E. Class C extends B implements X, Y { }
Answer: AE
Q60. Given:
What should statement1, statement2, and statement3, be respectively, in order to produce the result?
Shape: constructor
Square: foo
Shape: foo
A. Option A
B. Option B
C. Option C
D. Option D
E. Option E
Answer: D