IP MIDTERM

An array is a list of data items that __________.

• all have the same type
• all have different names
• all are integers
• all are null

Which of the following can be used as an array subscript?

• character
• double
• int
• String

Assume an array is declared as follows. Which of the following statements correctly assigns the value 100 to each of the array elements? int[] num = new int[4];

• for(x=0; x<3; ++x) num[x] = 100;
• for(x=0; x<4; ++x) num[x] = 100;
• for(x=1; x<4; ++x) num[x] = 100;
• for(x=1; x<3; ++x) num[x] = 100;

Suppose you declare an array as follows: int[] creditScores = {670,720,815} What is the value of creditScores.lenght?

• 0
• 1.0
• 2.0
• 3.0

If a class named Student contains a method setID() that takes an int argument and you write an application in which you create an array of 20 Student objects named scholar. Which of the following statements correctly assigns an ID number to the first Student scholar?

• Student[0].setID(1234);
• scholar[0].setID(1234);
• Student.setID[0].(1234);
• scholar.setID[0](1234);

The following defines a ____ array. Int[][] nums = {{1,2} ,{3,4},{5,6}};

• one dimensional
• two dimensional
• three dimensional
• six dimensional

How many rows are contained in the following array? double [][] prices = {{2.56, 3.57, 4.58, 5.59}, {12.35, 13.35, 14.35, 15.00}};

• 1.0
• 2.0
• 4.0
• 8.0

What is the difference between a multidimensional array and an ArrayList of arrays in Java?

• A multidimensional array can only hold a single data type, while an ArrayList of arrays can hold multiple data types
• A multidimensional array has a fixed size, while an ArrayList of arrays can grow or shrink dynamically
• A multidimensional array is a primitive type, while an ArrayList of arrays is a data structure
• There is no difference between the two

How do you check if an ArrayList is empty in Java?

• myArrayList.isEmpty();
• myArrayList.size() == 0;
• myArrayList.size() == null;
• myArrayList == null;

What is an ArrayList in Java?

• A fixed-size array that can store elements of different data types
• A dynamic array that can grow or shrink in size and store elements of the same data type
• A collection of key-value pairs that can be accessed by their keys
• A data structure that represents a sequence of elements that can be accessed by their index numbers