Fill a Boolean Array in Java

Declaration :

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

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

Explanation :

Purpose	The java.util.Arrays.fill(boolean[] a boolean val) method assigns the specified boolean value to each element of the specified array of booleans.
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 any value.
Exception	NA

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 boolean array
		boolean arr[] = new boolean[] { false, true, false, false };
		// Print the array
		System.out.println("Original Array: ");
		for (boolean val : arr) {
			System.out.println("Original Element is " + val);
		}
		// Use 'fill' to place true
		Arrays.fill(arr, true);
		// Print new array
		System.out.println("\nNew array after filling elements: ");
		for (boolean 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 boolean array

boolean arr[] = new boolean[] { false, true, false, false };

// Print the array

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

for (boolean val : arr) {

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

}

// Use 'fill' to place true

Arrays.fill(arr, true);

// Print new array

System.out.println("\nNew array after filling elements: ");

for (boolean val : arr) {

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

}

Output of Program :

Original Array: 
Original Element is false
Original Element is true
Original Element is false
Original Element is false
New array after filling elements: 
New Element is true
New Element is true
New Element is true
New Element is true

Original Array:

Original Element is false

Original Element is true

Original Element is false

New array after filling elements:

New Element is true

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