Fill an Object Array in Java

Declaration :

public static void fill(Object[] a, Object val)

1	public static void fill(Object[] a, Object val)

Explanation :

Purpose	The java.util.Arrays.fill(Object[] a Object val) method assigns the specified Object reference to each element of the specified array of Objects.
Parameters	a ===> This is the array to be filled.
	val ===> This is the value to be stored in all elements of the array.
Return Value	This method does not return value.
Exception	ArrayStoreException — if the specified value is not of a runtime type that can be stored in the specified array.

Java Program : Example

Below example will explain java.util.Arrays.fill() method.

package com.c4learn;
import java.util.Arrays;
public class ArrayDemo {
	public static void main(String[] args) {
		// Initialize an object array
		Object arr[] = new Object[] { 10.5, 20.5, 30.5, 40.5, 50.5 };
		// Print the original array
		System.out.println("Original Array : ");
		for (Object val : arr) {
			System.out.println("Original element is " + val);
		}
		// Use fill to place 5.5
		Arrays.fill(arr, 5.5);
		// Print the new array
		System.out.println("\nNew Array is : ");
		for (Object val : arr) {
			System.out.println("New element is " + val);
		}
	}
}

package com.c4learn;

import java.util.Arrays;

public class ArrayDemo {

public static void main(String[] args) {

// Initialize an object array

Object arr[] = new Object[] { 10.5, 20.5, 30.5, 40.5, 50.5 };

// Print the original array

System.out.println("Original Array : ");

for (Object val : arr) {

System.out.println("Original element is " + val);

}

// Use fill to place 5.5

Arrays.fill(arr, 5.5);

// Print the new array

System.out.println("\nNew Array is : ");

for (Object val : arr) {

System.out.println("New element is " + val);

}

Output of Program :

Original Array : 
Original element is 10.5
Original element is 20.5
Original element is 30.5
Original element is 40.5
Original element is 50.5
New Array is : 
New element is 5.5
New element is 5.5
New element is 5.5
New element is 5.5
New element is 5.5

Original Array :

Original element is 10.5

Original element is 20.5

Original element is 30.5

Original element is 40.5

Original element is 50.5

New Array is :

New element is 5.5

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