Multidimensional arrays

What is the purpose of using a two-dimensional array in Java?

• To store linear collections of elements

• To represent a matrix or a table

• To perform common operations on arrays

• To pass arrays to methods

Answer explanation

To represent a matrix or a table

How can you declare and create a two-dimensional array in Java?

• Using a single-dimensional array

• Using shorthand notations

• Using a loop structure

• Using if-else statements

Answer explanation

Using shorthand notations is the correct way to declare and create a two-dimensional array in Java.

What is the main advantage of using a ragged array in Java?

• It can store elements of different lengths in each row

• It allows for more efficient memory usage

• It simplifies array manipulation

• It reduces the complexity of array operations

Answer explanation

It can store elements of different lengths in each row

How can you sum all elements in a two-dimensional array by column in Java?

• Using a single loop

• By transposing the array

• By summing elements row by row

• By summing elements column by column

Answer explanation

By summing elements column by column

What is the syntax for creating a three-dimensional array in Java?

• int[][][] array = new int[3][3][3];

• array[][][] = new array[3][3][3];

• double[][][] array = new double[5][5][5];

• dataType[][][] array = new dataType[10][10][10];

Answer explanation

The correct syntax for creating a three-dimensional array in Java is double[][][] array = new double[5][5][5];

How can you calculate the total score for students in a class using a three-dimensional array in Java?

• By finding the maximum value in the array

• By multiplying the elements in each column

• By averaging the elements in each row

• By summing all elements in the array

Answer explanation

By summing all elements in the array

What is the purpose of the GuessBirthday program in Java?

• To demonstrate array manipulation

• To guess the user's birthday

• To calculate the average temperature and humidity

• To store meteorological data

Answer explanation

The purpose of the GuessBirthday program in Java is to demonstrate array manipulation.

How can you prompt the user for answers using a loop in Java?

• By using a switch statement

• By using a do-while loop

• By using a for loop

• By using recursion

Answer explanation

By using a for loop, you can repeatedly prompt the user for answers until a certain condition is met, making it an effective choice for this task in Java.