EX 23: Java Arrays

What is an array in Java?

• A data structure that can hold a variable number of values

• A type of loop in Java

• A container object that holds a fixed number of values of a single type

• A collection of different data types

How are elements accessed in an array in Java?

• By their size

• By their data type

• By their numerical index

• By their alphabetical order

What is the output of the following code snippet? int[] anArray = {10, 20, 30}; System.out.println(anArray[1]);

• 20

• 30

• Error

• 10

Which method is used to efficiently copy data from one array to another in Java?

• duplicateArray

• copy

• copyArray

• arrayCopy

What does the java.util.Arrays class provide for array manipulations?

• Only sorting methods

• Only searching methods

• Several common tasks like copying, sorting, and searching arrays

• Only copying methods

How can you determine the size of an array in Java?

• Using the getSize method

• Using the length property

• Using the count property

• Using the sizeOf method

What is the correct way to declare an array of integers in Java?

• array[] anArray;

• int anArray[];

• array anArray[];

• int[] anArray;

Which method is used to compare two arrays in Java?

• checkEquality

• compareArrays

• equals

• arrayEquals

What is the purpose of the System.arraycopy method in Java?

• To delete elements from an array

• To efficiently copy data from one array to another

• To reverse the elements of an array

• To create a new array

In Java, how can you access the 5th element of an array?

• array[4]

• array[5]

• array[6]

• array[0]