Chapter 7

Question 1

The __________ method sorts the array scores of the double[] type.

Answer 1

java.util.Arrays.sort(scores)

Question 2

What is the output of the following code?
int[] myList = {1, 2, 3, 4, 5, 6};
for (int i = myList.length - 2; i >= 0; i–) {
myList[i + 1] = myList[i];
}
for (int e: myList)
System.out.print(e + “ “);

Answer 2

1 1 2 3 4 5

Question 3

How many elements are in array double[] list = new double[5]?

Answer 3

5

Question 4

In the following code, what is the output for list1?
public class Test {
     public static void main(String[] args) {
          int[] list1 = {1, 2, 3};
          int[] list2 = {1, 2, 3};
          list2 = list1;
          list1[0] = 0; list1[1] = 1; list2[2] = 2;
          for (int i = 0; i < list1.length; i++)
               System.out.print(list1[i] + " ");
     }
}

Answer 4

0 1 2

Question 5

If you declare an array double[] list = {3.4, 2.0, 3.5, 5.5}, list[1] is ________.

Answer 5

2.0

Question 6

Assume int[] scores = {1, 20, 30, 40, 50}, what value does java.util.Arrays.binarySearch(scores, 30) return?

Answer 6

2

Question 7

When you return an array from a method, the method returns __________.

Answer 7

the reference of the array

Question 8

What is output of the following code:
public class Test {
     public static void main(String[] args) {
          int list[] = {1, 2, 3, 4, 5, 6};
          for (int i = 1; i < list.length; i++)
               list[i] = list[i - 1];

      for (int i = 0; i < list.length; i++)
           System.out.print(list[i] + " ");
 } }

Answer 8

1 1 1 1 1 1

Question 9

The __________ method copies the sourceArray to the targetArray.

Answer 9

System.arraycopy(sourceArray, 0, targetArray, 0, sourceArray.length);

Question 10

The JVM stores the array in an area of memory, called _______, which is used for dynamic memory allocation where blocks of memory are allocated and freed in an arbitrary order.

Answer 10

heap

Question 11

In the following code, what is the output for list2?
public class Test {
     public static void main(String[] args) {
          int[] list1 = {1, 2, 3};
          int[] list2 = {1, 2, 3};
          list2 = list1;
          list1[0] = 0; list1[1] = 1; list2[2] = 2;
          for (int i = 0; i < list2.length; i++)
               System.out.print(list2[i] + " ");
     }
}

Answer 11

0 1 2

Question 12

Suppose a method p has the following heading:
public static int[] p()
What return statement may be used in p()?

Answer 12

return new int[]{1, 2, 3};

Question 13

Assume int[] scores = {1, 20, 30, 40, 50}, what is the output of System.out.println(java.util.Arrays.toString(scores))?

Answer 13

[1, 20, 30, 40, 50]

Question 14

Analyze the following code:
public class Test {
     public static void main(String[] args) {
          int[] x = {1, 2, 3, 4};
          int[] y = x;
          x = new int[2];
          for (int i = 0; i < y.length; i++)
               System.out.print(y[i] + " ");
     }
}

Answer 14

The program displays 1 2 3 4

Question 15

When you pass an array to a method, the method receives __________.

Answer 15

the reference of the array

Question 16

The reverse method is defined in the textbook. What is list1 after executing the following statements?
int[] list1 = {1, 2, 3, 4, 5, 6};
list1 = reverse(list1);

Answer 16

list1 is 6 5 4 3 2 1

Question 17

Assume int[] t = {1, 2, 3, 4}. What is t.length?

Answer 17

4

Question 18

public class Test {
     public static void main(String[] args) {
     int[] x = {120, 200, 016};
     for (int i = 0; i < x.length; i++)
          System.out.print(x[i] + " ");
     }
}

Answer 18

120 200 14

Question 19

The reverse method is defined in this section. What is list1 after executing the following statements?
int[] list1 = {1, 2, 3, 4, 5, 6};
int[] list2 = reverse(list1);

Answer 19

1 2 3 4 5 6

Question 20

What is the output of the following code?
double[] myList = {1, 5, 5, 5, 5, 1};
double max = myList[0];
int indexOfMax = 0;
for (int i = 1; i < myList.length; i++) {
     if (myList[i] > max) {
          max = myList[i];
          indexOfMax = i;
     }
}
System.out.println(indexOfMax);

Answer 20

1

Question 21

Analyze the following code:
public class Test {
     public static void main(String[] args) {
          int[] a = new int[4];
          a[1] = 1;
          a = new int[2];
          System.out.println("a[1] is " + a[1]);
     }
}

Answer 21

The program displays a[1] is 0.

Question 22

If you declare an array double[] list = {3.4, 2.0, 3.5, 5.5}, the highest index in array list is __________.

Answer 22

3

Question 23

What is the correct term for numbers[99]?

Answer 23

indexed variable

Question 24

What is the representation of the third element in an array called a?

Answer 24

a[2]

Question 25

Analyze the following code:
public class Test {
     public static void main(String[] args) {
          double[] x = {2.5, 3, 4};
          for (double value: x)
               System.out.print(value + " ");
     }
}

Answer 25

The program displays 2.5 3.0 4.0