What is an Array in java with example

Array is collection of similar kind of data. Array in java is index based , first element of the array is stored at 0 index.

Benefits (Advantages) of array:-

1.  Code Optimization
2.  Performance increase

Disadvantage Disadvantage of array is “size limit “.

Types of array:

1. Single Dimensional Array 
2. Multidimensional Array

Many types of syntax to declared in array:

1. dataType[] arr; (or)  
2. dataType []arr; (or)  
3. dataType arr[];  

1 Example of single Dimensional array

/**

 *

 * @author pradeep

 */

class ArrayDemo {

    public static void main(String[] args) {

        /*int marks[]=new int[5];

        marks[0]=33;

        marks[1]=65;

        marks[2]=69;

        marks[3]=78;

        marks[4]=86;

        * */

        //int marks[]=new int[]{33,65,69,78,86};

        int marks[]={33,65,69,78,86};

        for(int i=0;i<5;i++)

        {

            System.out.println(“print marks:”+marks[i]);

        }

    }

}

2. Example of MultiDimensional array

/**

 *

 * @author pradeep

 */

class MultiDimensionalArray{  

public static void main(String args[]){  

//declaring and initializing 2D array  

int array[][]={{6,7,8},{4,6,8},{3,6,9}};  

//printing 2D array  

for(int i=0;i<3;i++){  

 for(int j=0;j<3;j++){  

   System.out.print(“Multi Dimensional Array” +array[i][j]+” “);  

 }  

 System.out.println();  

}  

}}  

Result: Output of this result is:

run:

Multi Dimensional Array6 Multi Dimensional Array7 Multi Dimensional Array8 

Multi Dimensional Array4 Multi Dimensional Array6 Multi Dimensional Array8 

Multi Dimensional Array3 Multi Dimensional Array6 Multi Dimensional Array9 

BUILD SUCCESSFUL (total time: 0 seconds)

Note: If you have any problem then reply me.