This document discusses arrays in Java programming. It defines arrays as collections of multiple values of the same data type stored in a single variable and accessed via indexes. It explains how to declare arrays with and without initializing values, and how to access array elements by specifying the array name and index. The document also introduces the concept of pairing arrays by index to store related data, like a user's email, username, and password.

1. JAVA PROGRAMMING
Arrays

2. Objectives
•Arrays
•Declaring Arrays
•Accessing Array Elements
•Paired Arrays By Index

3. Arrays
•Is a Collection of Multiple Values in
a Single Variable with the Same
Datatype they are governed by
using an index.

4. Elements
•Are the individual values in an
array.

5. Declaring Arrays
Declare w/ Values
dataype identifier[] = {value1, value2, value, value4};
String names[] = {“Pedro” , “Penduko”, “Totoy”};
Declare w/o Values
datatype identifier[] = new datatype[size];
String name[] = new String[4];

6. Index
Is a number that represents a
position in a collection.

7. Accessing Array
VALUE “Totoy” “Brown” “Juan” “Jose” “Pedro”
INDEX 0 1 2 3 4

8. Accessing Array
Reading Array Element
Identifier[index];
Names[0];
Assigning Array Element
Identifier[index] = value;
Names[0] = “Totoy”

9. Accessing Array
Assigning Array Element w/ User Input
Scanner s = newScanner(System.in);
Names[0] = s.nextline();

10. Paired Arrays By Index
Create 3 arrays that will hold 5 user’s credentials:
• Email
• Username
• Password
For Example: email[0], username[0] and
password[0] should belong to the same user.

11. Paired Arrays By Index
We will output the user’s credentials by using an
int variables as an index.
Sample Output
Index :0
Email :totoy@gmail.com
Username :totoybrown
Password :diakosunog