Which declaration initializes a boolean variable a

QUESTION 44
Which declaration initializes a boolean variable?
A. boolean h = 1;
B. boolean k = 0;
C. boolean m = null;
D. boolean j = (1 < 5) ;
Correct Answer: D
Section: (none)

Explanation
Explanation/Reference:
QUESTION 45
Given:
public class Basic
{
private static int letter;
public static int getLetter();
public static void Main(String[] args)
{
System.out.println(getLetter());
}
}
Why will the code not compile?
B
Section: (none)
Explanation
Explanation/Reference:
QUESTION 46
Given:
public class Circle
{
double radius;
public double area
public Circle(double r)
{
radius = r;
}
public double getRadius()
{
return radius;
}
public void setRadius(double r)
{
radius = r;
}
public double getArea()
{
return /* ??? */;
}
}
class App

{
public static void main(String[] args)
{
Circle c1 = new Circle(17.4);
c1.area = Math.PI * c1.getRadius() * c1.getRadius();
}
}
This class is poorly encapsulated. You need to change the circle class to compute and return the area
instead.
What three modifications are necessary to ensure that the class is being properly encapsulated?
Correct Answer: ABC
Section: (none)
Explanation
Explanation/Reference:
QUESTION 47
Given a code fragment:
StringBuilder sb = new StringBuilder();
String h1 = "HelloWorld";
sb.append("Hello").append("world");
if (h1 == sb.toString())
{
System.out.println("They match");
}
if (h1.equals(sb.toString()))
{
System.out.println("They really match");
}
What is the result?
D
Section: (none)
Explanation
Explanation/Reference:
QUESTION 48
Given the following code:
public class Simple
{ /* Line 1 */

public float price; /* Line 2 */
public static void main(String[] args)
{ /* Line 3 */
Simple price = new Simple(); /* Line 4 */
price = 4; /* Line 5 */
} /* Line 6 */
} /* Line 7 */
What will make this code compile and run?
A. Change line 2 to the following:
Publicint price
B. Change line 4 to the following:
int price = new simple ();
C. Change line 4 to the following:
Floatprice = new simple ();
D. Change line 5 to the following:
Price = 4f;
E. Change line 5 to the following:
price.price = 4;
F. Change line 5 to the following:
Price= (float) 4:
G. Change line 5 to the following:
Price= (Simple) 4;
H. The code compiles and runs properly; no changes are necessary
Correct Answer: E
Section: (none)
Explanation
Explanation/Reference: