JAVA Array Tutorial for Selenium WebDriver with Example

Java Array:

The array is a collection of elements of the same type that are nearby memory spaces.

We can store only a certain set of elements in a java array.

The array index is based, the first element of the array is stored in the 0 index.

Types of Array:

One Dimensional Array
Two Dimensional Array

Java program contains steps in array:

Announce the name of the array.
Create an array.
Start array values.

Array Features:

It is always indexed. Index starts with 0.
This is a collection of similar data types.
It is in a closest memory place.

Array Pass with reference:

Arrays are passed in terms of reference, or as an indicator of origin.
This means that whatever array you make inside the function affects the root.

One dimensional array:

A one-dimensional array is like a spreadsheet with data in only one line.

Syntax:

dataType[] arr; (or) 

dataType []arr; (or) 

dataType arr[];

dataType[] arr; (or)

dataType []arr; (or)

dataType arr[];

Explanation:

An array declaration has two components: array type and array name.

The type of an array is written as type [], where type elements are the type of data; Brackets are special symbols which indicate that this variable holds an array.

The size of the array is not part of its type.

With other types of variables, the announcement does not actually make a Java array; It only tells the compiler that in this variable there will be an array of the specified type.

Example:

package package_Java;

class One_Array_Java {

      public static void main(String args[]) {
            // declaration and instantiation
            int a[] = new int[5];
            // initialization
            a[0] = 10;
            a[1] = 20;
            a[2] = 70;
            a[3] = 40;
            a[4] = 50;

            // length is the property of array
            for (int i = 0; i &lt; a.length; i++)
            System.out.println(a[i]);
      }
}

package package_Java;

class One_Array_Java {

public static void main(String args[]) {

// declaration and instantiation

int a[] = new int[5];

// initialization

a[0] = 10;

a[1] = 20;

a[2] = 70;

a[3] = 40;

a[4] = 50;

// length is the property of array

for (int i = 0; i < a.length; i++)

System.out.println(a[i]);

}

Output:

Another way of creating and initializing same one dimensional array is as shown below.

int a[]={10,20,70,40,50};

1	int a[]={10,20,70,40,50};

Two Dimensional Array:

In the Java software development language, two-dimensional array is like a spreadsheet with multiple rows and columns, each with different data in each slot.

Each cell will be identified by its unique line and column index combination (e.g. SR 1 [3] [2]).

We can use a two-dimensional array to store user IDs and passwords of different users.

Syntax:

dataType[][] arrayRefVar; (or) 

dataType [][]arrayRefVar; (or) 

dataType arrayRefVar[][]; (or) 

dataType []arrayRefVar[];

dataType[][] arrayRefVar; (or)

dataType [][]arrayRefVar; (or)

dataType arrayRefVar[][]; (or)

dataType []arrayRefVar[];

Example:

package package_Java;

public class Two_Array_Java {

      public static void main(String[] args) {

            String str[][] = new String[3][2]; // 3 rows, 2 columns

            str[0][0] = "user_1";
            str[1][0] = "user_2";
            str[2][0] = "user_3";
            str[0][1] = "pwd_1";
            str[1][1] = "pwd_2";
            str[2][1] = "pwd_3";

            // This for loop will be total executed 3 times.
            for (int i = 0; i &lt; str.length; i++) {

            // for loop wexecuted for 2 time every iteration.
            for (int j = 0; j &lt; str[i].length; j++) {

                        System.out.println(str[i][j]);

                  }
            }
      }
}

package package_Java;

public class Two_Array_Java {

public static void main(String[] args) {

String str[][] = new String[3][2]; // 3 rows, 2 columns

str[0][0] = "user_1";

str[1][0] = "user_2";

str[2][0] = "user_3";

str[0][1] = "pwd_1";

str[1][1] = "pwd_2";

str[2][1] = "pwd_3";

// This for loop will be total executed 3 times.

for (int i = 0; i < str.length; i++) {

// for loop wexecuted for 2 time every iteration.

for (int j = 0; j < str[i].length; j++) {

System.out.println(str[i][j]);

}

Output:

user_1
pwd_1
user_2
pwd_2
user_3
pwd_3

user_1

pwd_1

user_2

pwd_2

user_3

pwd_3