APDQ 2.1 - 2.3

Consider the following code segment.

int temp = 75;

String choice;

boolean hasSibling = false;

if (temp < 70)

{

choice = "Indoors";

}

else

{

choice = "Outdoors";

}

if (hasSibling)

{

choice += " with sibling";

}

What is the value of choice after executing the code segment?

• "Indoors"

• "Outdoors"

• "Indoors with sibling"

• "Outdoors with sibling"

Consider the following code segment.

int x = 3;

int y = -1;

if (x - 2 > y)

{

x -= y;

}

if (y + 3 >= x)

{

y += x;

}

System.out.print("x = " + x + ", y = " + y);

What is printed as a result of executing the code segment?

• x = 2, y = 1

• x = 3, y = 2

• x = 4, y = -1

• x = 4, y = 3

Consider the following two code segments where the int variable choice has been properly declared and initialized.

Code Segment 1

if (choice > 10)

{

System.out.println("blue");

}

else if (choice < 5)

{

System.out.println("red");

}

else

{

System.out.println("yellow");

}

Code Segment 2

if (choice > 10)

{

System.out.println("blue");

}

if (choice < 5)

{

System.out.println("red");

}

else

{

System.out.println("yellow");

}

Assume that both code segments initialize choice to the same integer value. Which of the following best describes the conditions on the initial value of the variable choice that will cause the two code segments to produce different output?

• choice > 5 and choice < 10

• choice > 10

• choice == 5 or choice == 10

• There is no value for choice that will cause the two code segments to produce different output.

Consider the following partial Person class definition. The instance variable adult should be set to true if the person’s age is at

least 18 years old, and should be set to false otherwise.

public class Person

{

private String name;

private int age;

private boolean adult;

public Person(String n, int a)

{

name = n;

age = a;

if (age >= 18)

{

adult = true;

}

else

{

adult = false;

}

}

// There are no other constructors.

// There may be other methods that are not shown.

}

Which of the following statements, when appearing in a method in a class other than Person, will correctly a

create an instance of a Person object that represents an adult person?

• Person p = new Person("Homer", 23);

• Person p = new Person("Homer", "23");

• Person p = new Person("Homer", true);

• Person p = new Person("Homer", 17);

In the following code segment, the int variables a, b, c, and d have been properly declared and initialized.

if (a < b || c != d)

{

System.out.println("dog");

}

else

{

System.out.println("cat");

}

5. Which of the following code segments produces the same output as the given code segment for all values of a, b, c, and d?

• if (a < b && c != d)

  {

  System.out.println("dog");

  }

  else

  {

  System.out.println("cat");

  }

• if (a > b && c == d)

  {

  System.out.println("cat");

  }

  else

  {

  System.out.println("dog");

  }

• if (a >= b || c == d)

  {

  System.out.println("cat");

  }

  else

  {

  System.out.println("dog");

  }

• if (a >= b && c == d)

  {

  System.out.println("cat");

  }

  else

  {

  System.out.println("dog");

  }

Consider the following code segment.

int a = 10;

int b = 5 * 2;

System.out.print(a == b);

What is printed as a result of executing the code segment?

• 10

• 10 == 10

• true

• false

Consider the following code segment. double regularPrice = 100.0; boolean onClearance = true; boolean hasCoupon = false; double finalPrice = regularPrice; if (onClearance) { finalPrice -= finalPrice * 0.25; } if (hasCoupon) { finalPrice -= 5.0; } System.out.println(finalPrice); What is printed as a result of executing the code segment?

• 20.0

• 25.0

• 70.0

• 75.0

In the following code segment, arr1 and minArray are properly declared and initialized int arrays of equal length.

During the traversal of the array, each element of arr1 is compared to the corresponding element of minArray located at

the same index. If any element of arr1 is smaller than the corresponding element of minArray, the code segment is

intended to replace that element of minArray with the corresponding element of arr1. After the code segment is

executed, arr1 should remain unchanged and minArray should hold the lesser of the two elements originally found at

corresponding indices in arr1 and minArray.

The code segment does not work as intended.

for (int c = 0; c < arr1.length; c++) // Line 1

{ // Line 2

if (arr1[c] < minArray[c]) // Line 3

{ // Line 4

arr1[c] = minArray[c]; // Line 5

} // Line 6

else // Line 7

{ // Line 8

minArray[c] = arr1[c]; // Line 9

} // Line 10

} // Line 11

• Changing the relational operator in line 3 to >

• Removing lines 5 through 8

• Swapping the positions of line 5 and line 9

• Removing lines 7 through 10

Consider the following statement.

boolean x = (5 < 8) == (5 == 8);

What is the value of x after the statement is executed?

• 5

• 8

• true

• false

In the following Boolean expression, the int variables x and y have been properly declared and initialized.

(x <= 10) == (y > 25)

Which of the following values for x and y will result in the expression evaluating to true?

• x = 8 and y = 25

• x = 10 and y = 10

• x = 10 and y = 30

• x = 15 and y = 30