Java Cahpter 6,7
________ refers to combining data and code into a single object.
Encapsulation
A constructor ________. has the same name as the class always has a private access specifier always accepts two arguments has the return type of void
Has the same name as the class
What does the following statement do? double[] array1 = new double[10]; It creates an instance of an array of ten double values. It will allow valid subscripts in the range of 0 through 9. It declares array1 to be a reference to an array of double values. It does all of these.
It does all of these.
Class objects normally have ________ that perform useful operations on their data, but primitive variables do not.
Methods
A group of related classes is called a(n) ________.
Package
A constructor is a method that ________.
Performs initialization or setup operations.
Instance methods do not have the ________ key word in their headers.
Static
Java allows you to create objects of the ________ class in the same way you would create primitive variables.
String
Which of the following statements will create a reference, str, to the String "Hello, World"?
String str = "Hello, World";
The scope of a public instance field is ________.
The instance methods and methods outside the class
The sequential search algorithm ________.
Uses a loop to sequentially step through an array, starting with the first element
What does the following UML diagram entry mean? + setHeight(h : double) : void
a public method with a parameter of data type double that does not return a value
For the following code, what would be the value of str[2]? String[] str = {"abc", "def", "ghi", "jkl"};
a reference to the String object containing "ghi"
A ragged array is ________.
a two-dimensional array where the rows are of different lengths
The ________ method is used to insert an item into an ArrayList.
add
The following statement is an example of ________.import java.util.Scanner;
an explicit import statement
Java performs ________, which means that it does not allow a statement to use a subscript that is outside the range of valid subscripts for the array.
array bounds checking
A(n) ________ can be thought of as a blueprint that can be used to create a type of ________.
class, Object
In memory, an array of String objects ________.
consists of an array of references to String objects
Overloading means that multiple methods in the same class ________.
have the same name but different parameter lists
You should not define a class that is dependent on the values of other class fields ________.
in order to avoid having stale data
Another term for an object of a class is a(n) ________.
instance
Which of the following is a valid declaration for a ragged array with five rows but no columns?
int[][] ragged = new int[5][];
A search algorithm ________.
is used to locate a specific item in a larger collection of data.
When an array is passed to a method ________.
it is passed just as any other object would be passed the method has direct access to the original array a reference to the array is passed All of these are true
The ________ package is automatically imported into all Java programs.
java.lang
Each array in Java has a public field named ________ that contains the number of elements in the array.
length
To return an array of long values from a method, which return type should be used for the method?
long[]
A reference variable stores a(n) ________.
memory address
If numbers is a two-dimensional array, which of the following would give the number of columns in row r?
numbers[r].length
A UML diagram does not contain ________.
object names
Which of the following is a correct method header for receiving a two-dimensional array as an argument?
public static void passMyArray(int[][])
The ________ method removes an item from an ArrayList at a specific index.
remove
In order to do a binary search on an array ________.
the array must first be sorted
The scope of a private instance field is ________.
the instance methods of the same class
The binary search algorithm ________.
will cut the portion of the array being searched in half each time it fails to locate the search value
LOOK AT THE CODE IN HW 6,7
!
Data hiding (which means that critical data stored inside the object is protected from code outside the object) is accomplished in Java by ________.
using the private access specifier on the class fields
Which symbol indicates that a member is public in a UML diagram?
+
Given the following two-dimensional array declaration, which statement is true?int[][] numbers = new int[6][9];
The numbers array has 6 rows and 9 columns.
Which symbol indicates that a member is private a UML diagram?
-
If final int SIZE = 15 and int[] x = new int[SIZE], what would be the range of subscript values that could be used with x[]?
0 through 14
It is common practice in object-oriented programming to make all of a class's ________.
fields private
Given that String[] str has been initialized, to get a copy of str[0] with all the characters converted to uppercase, you would use the ________ statement.
str[0].toUpperCase();
When an individual element of an array is passed to a method ________.
the method does not have access to the original array
When an object is passed as an argument to a method, what is passed into the method's parameter variable?
the object's memory address
Two or more methods in a class may have the same name as long as ________.
they have different parameter lists
