What are the default array values in Java?

In Java arrays are the reference types which stores multiple elements of the same datatype. You can create an array just like an object using the new keyword −

type[] reference = new type[10];

or, directly using the flower brackets ({}).

int [] myArray = {10, 20, 30, 40, 50}

When you create instance variables in Java you need to initialize them, else the compiler will initialize on your behalf with default values.

Similarly, if you create an array as instance variable, you need to initialize it else the compiler initializes with default values which are −

• Integer − 0
• Byte − 0
• Float − 0.0
• Boolean − false
• String/Object − null

Example

In the following Java program prints the default values of the arrays of type integer, float, byte, boolean and, String.

import java.util.Arrays;
import java.util.Scanner;
public class ArrayDefaultValues {
   int intArray[] = new int[3];
   float floatArray[] = new float[3];
   byte byteArray[] = new byte[3];
   boolean boolArray[] = new boolean[3];
   String stringArray[] = new String[3];
   public static void main(String args[]){
      ArrayDefaultValues obj = new ArrayDefaultValues();
      System.out.println(Arrays.toString(obj.intArray));
      System.out.println(Arrays.toString(obj.floatArray));
      System.out.println(Arrays.toString(obj.byteArray));
      System.out.println(Arrays.toString(obj.boolArray));
      System.out.println(Arrays.toString(obj.stringArray));
   }
}

Output

[0, 0, 0]
[0.0, 0.0, 0.0]
[0, 0, 0]
[false, false, false]
[null, null, null]

Venkata Sai

Updated on 30-Jul-2019 22:30:26

• Related Questions & Answers
• Default array values in Java
• What are the default initialization values of elements in an array using Java?
• What are Default Constructors in Java?
• What are Default Methods in Java 8?
• What are the default values of instance variables whether primitive or reference type in Java?
• What are the default values used by DB2 for various data types?
• What are the differences between default constructor and parameterized constructor in Java?
• What are the differences between protected and default access specifiers in Java?
• What are default arguments in python?
• What are Default parameters in JavaScript?
• Do local variables in Java have default values?
• Display default initial values of DataTypes in Java
• What are private, public, default and protected access Java modifiers?
• Mapping an array to a new array with default values in JavaScript
• What are default function parameters in JavaScript?