Lesson 3: Array

Array

A fundamental data structure in Java.

Array

Allows you to store a collection of elements of the same type.

Array

Provides a convenient way to organize and manipulate data.

Array

Stores data as a contiguous block of memory.

One Dimensional Array

A data structure that allows you to store multiple elements of the same type.

One Dimensional Array

Stores elements in a contiguous block of memory.

One Dimensional Array

The simplest form of array.

One Dimensional Array

Provides a convenient way to store and manipulate collections of data.

int[] variable = new int[];

Syntax of an array declaration

Value

The data stored inside an array element.

Index Number

The position of an element inside an array.

Arrays

Used to store many values in one variable.

Arrays

Used to keep data organized.

Arrays

Used to make it easy to loop and process data.

Array Declaration

What do you call this: int[] numbers = new int[5];

Array Initialization

What do you call this: int[] numbers = {1, 2, 3, 4, 5};

Accessing Array Values

Retrieving values stored inside an array.

Accessing Array Values

Uses the index number to get a specific value.

Index

The position of a value in an array.

Index

Always starts from 0.

Using Array with Loop

A method used to process array elements repeatedly.

Using Array with Loop

Allows accessing each element of the array one by one.

Using Array with Loop

Commonly used to display or modify array values.

Using Array with Loop

Helps reduce repetitive code.

Using Array with Loop

Can be done using iterative structures.

• One Dimensional Array

• Two Dimensional Array

• Multi Dimensional Array

These are the three types of Array.

Multi Dimensional Array

An array that contains multiple rows and columns.

Multi Dimensional Array

Forms a grid-like structure.

Multi Dimensional Array

Used to store and manipulate data in tabular format.

Multi-Dimensional Arrays

declaring the array and specifying its dimensions.

Two-Dimensional Array

The most common type of multi-dimensional array.

Two-Dimensional Array

Represents a grid with rows and columns.

Two-Dimensional Array Declaration Syntax

type[][] arrayName = new type[rowSize][columnSize];

Row, Column

What is declared inside the closed brackets in an Array Declaration?
data type[][] variable = new data type[][]

10, 20, 30, 40

What is the output?

Score: 85
Score: 90
Score: 78
Score: 88

What is the output?

Total = 50

What is the output?

Highest number = 45

What is the output?

Lyca
Kayne
Dbezt
Wency

What is the output?

import java.util.Arrays;

The statement that allows a Java program to use the static methods of the built-in Arrays utility class without needing to specify its full package name every time a method is called.

sort()

Sorts an array into ascending order.

variable.length

It is a built-in function in the Array class that gives total number of elements in the array. The . calls the member that does this function in the Array class.

Array Traversal

It is done to access each elements in the array one by one; always done using loop structures.

Apple
Banana
Orange
Mango
Grapes
Pineapple

What is the output?

1 2 3
4 5 6
7 8 9 

What is the output?

Apple Banana Orange
Mango Grapes Pineapple