Default array values in Java

1.9

If we don’t assign values to array elements, and try to access them, compiler does not produce error as in case of simple variables. Instead it assigns values which aren’t garbage.

Below are the default assigned values.

  • boolean : false
  • int : 0
  • double : 0.0
  • String : null
  • User Defined Type : null
// Java program to demonstrate default values of array
// elements
class ArrayDemo
{
    public static void main(String[] args)
    {
        System.out.println("String array default values:");
        String str[] = new String[5];
        for (String s : str)
            System.out.print(s + " ");

        System.out.println("\n\nInteger array default values:");
        int num[] = new int[5];
        for (int val : num)
             System.out.print(val + " ");

        System.out.println("\n\nDouble array default values:");
        double dnum[] = new double[5];
        for (double val : dnum)
            System.out.print(val + " ");

        System.out.println("\n\nBoolean array default values:");
        boolean bnum[] = new boolean[5];
        for (boolean val : bnum)
            System.out.print(val + " ");

        System.out.println("\n\nReference Array default values:");
        ArrayDemo ademo[] = new ArrayDemo[5];
        for (ArrayDemo val : ademo)
            System.out.print(val + " ");
    }
}

Output:

String array default values:
null null null null null 

Integer array default values:
0 0 0 0 0 

Double array default values:
0.0 0.0 0.0 0.0 0.0 

Boolean array default values:
false false false false false 

Reference Array default values:
null null null null null 

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