How to declare an empty array in java?

An array, in java, is a data structure that contains multiple independent variables of the same type. Creating arrays is one of the basic things that should be known to all the programmers out there. However, when you create an array in java, it creates one with an uninitialized memory size. It means that the memory required for such an array is allocated at runtime. 

empty array java

on Jan 01, 1970
//where n is the length you want the array to be
// for integer array
int[] intArray = new int[n];
// for String array
String[] strArray = new String[n];

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java empty array

on Jan 01, 1970
String [] names = new String[0];

// or 

int [] ages = {} 

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create an empty array in java

on Jan 01, 1970
public static void main(String args[])
{
    int array[] = new int[4];
    int number = 5, i = 0,j = 0;
    while (i<4){
        array[i]=number;
        i=i+1;
    }
    while (j<4){
        System.out.println(array[j]);
        j++;
    }
}

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empty array java

on Jan 01, 1970
int[] notAnArray = null;

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This approach makes sense most of the time but may cause performance issues in specific scenarios where we need to declare an array without hardcoding its size or we want to allow users to create an array of any size.

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