Java – One-Dimensional Array with Example

A one-dimensional array in Java is an array with a bunch of values that are declared with a single index. Here data are stored in a single column as shown below in an example.

Array declaration:

 data_type [] array_Name;
 or
 data_type[] array-name 
 or
 data_type array-name[]; 

Example:

//to store integer value
 int intArray[];
 or
 int []intArray;

An array declaration has two components:
The type that is the data-type of an element and the name that is given by user choice with the brackets[].

Array initialization:

To initialize an array new is used and it appears as follows:

var-name = new data-type [size];

Example:

Array = new int[10];

We can also set by combining declaration and initialization in the following ways:

 dataType[] arrayRefVar = new dataType[arraySize];
 or
 dataType[] arrayRefVar = {value0, value1, ..., valuek};

Accessing an array element:

Array elements can be accessed by using its index number, where each element is assigned by one index number.
Example:

age[2] = 14; // insert 14 to third element

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Example of a one-dimensional array in Java:

  public class ArrayTest
  {    
    public static void main(String args[])
    {  
      int a[]={10,22,4,7};//declaration, instantiation and initialization
        
     //displaying array  
     for(int i=0; i < a.length; i++)  
        {
        System.out.println(a[i]);
        }
    }
  }

Output:

  10
  22
  4
  7

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