Java Ch 9 Quiz

1. How many dimensions are in the following array: int[][][][][][] ndims = new int[5][5][5][5][5][5];

The given array "ndims" is declared with six sets of brackets, indicating six dimensions. Each set of brackets represents a separate dimension in the array. Therefore, the array has a total of six dimensions.

Explanation

The given array "ndims" is declared with six sets of brackets, indicating six dimensions. Each set of brackets represents a separate dimension in the array. Therefore, the array has a total of six dimensions.

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2. True or False: As with other arrays, you can use the operator new to instantiate multidimensional arrays.

True

False

You can use the operator new to instantiate multidimensional arrays just like you would with other arrays. This means that you can dynamically allocate memory for a multidimensional array using the new operator and then access and manipulate its elements.

Explanation

You can use the operator new to instantiate multidimensional arrays just like you would with other arrays. This means that you can dynamically allocate memory for a multidimensional array using the new operator and then access and manipulate its elements.

3. True or False: An array in Java can have any number of dimensions.

True

False

An array in Java can have any number of dimensions, meaning it can be one-dimensional, two-dimensional, three-dimensional, and so on. This allows for flexibility in storing and accessing data in a structured manner. Whether it is a single row or column, a matrix, or a multi-dimensional structure, Java arrays can accommodate any number of dimensions based on the programmer's requirements.

Explanation

An array in Java can have any number of dimensions, meaning it can be one-dimensional, two-dimensional, three-dimensional, and so on. This allows for flexibility in storing and accessing data in a structured manner. Whether it is a single row or column, a matrix, or a multi-dimensional structure, Java arrays can accommodate any number of dimensions based on the programmer's requirements.

4. True or False: The following array is of type String: String[] integers = new String[10];

True

False

The given array declaration "String[] integers = new String[10]" indicates that the array is of type String. The keyword "String" before the square brackets [] specifies the type of elements that the array can hold. Therefore, the statement "The following array is of type String" is true.

Explanation

The given array declaration "String[] integers = new String[10]" indicates that the array is of type String. The keyword "String" before the square brackets [] specifies the type of elements that the array can hold. Therefore, the statement "The following array is of type String" is true.

5. True or False: The last index of the array above is 10.

True

False

The last index of an array is always one less than the length of the array. Therefore, if the last index of the array is 10, it means that the array has a length of 11. However, since the given answer is False, it implies that the last index of the array is not 10.

Explanation

The last index of an array is always one less than the length of the array. Therefore, if the last index of the array is 10, it means that the array has a length of 11. However, since the given answer is False, it implies that the last index of the array is not 10.

6. An exception is thrown when an array ____ goes out of bounds.

An exception is thrown when an array index goes out of bounds. This means that the index being accessed is either too small (less than 0) or too large (greater than or equal to the size of the array). This can happen when trying to access an element that does not exist in the array, causing the program to throw an exception to handle this error condition.

Explanation

An exception is thrown when an array index goes out of bounds. This means that the index being accessed is either too small (less than 0) or too large (greater than or equal to the size of the array). This can happen when trying to access an element that does not exist in the array, causing the program to throw an exception to handle this error condition.

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7. True or False: Multidimensional arrays are different from one-dimensional arrays in that they do not have a fixed number of components.

True

False

False. Multidimensional arrays do have a fixed number of components. The main difference between multidimensional and one-dimensional arrays is that multidimensional arrays have multiple dimensions or levels, while one-dimensional arrays have only one dimension or level. Each dimension in a multidimensional array has a fixed number of components, which determines the size and shape of the array.

Explanation

False. Multidimensional arrays do have a fixed number of components. The main difference between multidimensional and one-dimensional arrays is that multidimensional arrays have multiple dimensions or levels, while one-dimensional arrays have only one dimension or level. Each dimension in a multidimensional array has a fixed number of components, which determines the size and shape of the array.

8. True or False: Arrays cannot be passed as parameters into methods, but their elements can be passed individually.

True

False

Arrays can be passed as parameters into methods. When an array is passed as a parameter, the method can access and manipulate the elements of the array directly. This allows for more efficient and concise code, as the entire array can be processed within the method rather than passing each element individually.

Explanation

Arrays can be passed as parameters into methods. When an array is passed as a parameter, the method can access and manipulate the elements of the array directly. This allows for more efficient and concise code, as the entire array can be processed within the method rather than passing each element individually.

9. Two-dimensional arrays are in ____ form.

Two-dimensional arrays are in table form because they are organized in rows and columns, similar to a table. Each element in the array can be accessed using two indices, one for the row and one for the column. This allows for efficient storage and retrieval of data in a structured manner, making it easier to work with large sets of data.

Explanation

Two-dimensional arrays are in table form because they are organized in rows and columns, similar to a table. Each element in the array can be accessed using two indices, one for the row and one for the column. This allows for efficient storage and retrieval of data in a structured manner, making it easier to work with large sets of data.

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10. One-dimensional arrays are in ____ form.

One-dimensional arrays are typically represented in the form of a list. A list is a data structure that allows multiple values to be stored in a single variable. In the context of arrays, a list is used to store a sequence of elements in a linear manner. Each element in the list can be accessed using its index value, which represents its position in the array. Therefore, the correct answer is "list".

Explanation

One-dimensional arrays are typically represented in the form of a list. A list is a data structure that allows multiple values to be stored in a single variable. In the context of arrays, a list is used to store a sequence of elements in a linear manner. Each element in the list can be accessed using its index value, which represents its position in the array. Therefore, the correct answer is "list".

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