Fill a Double Array using Index in Java

Declaration :

public static void fill(double[] a, int fromIndex, int toIndex, double val)

1	public static void fill(double[] a, int fromIndex, int toIndex, double val)

Explanation :

Purpose	The java.util.Arrays.fill(double[] a int fromIndex int toIndex double val) method assigns the specified double value to each element of the specified range of the specified array of doubles. The range to be filled extends from index fromIndex inclusive to index toIndex exclusive.(If fromIndex==toIndex the range to be filled is empty.).
Parameters	a ===> This is the array to be filled.
	fromIndex ===> This is the index of the first element (inclusive) to be filled with the specified value.
	toIndex ===> This is the index of the last element (exclusive) to be filled with the specified value.
	val ===> This is the value to be stored in all elements of the array.
Return Value	This method does not return any value.
Exception	ArrayIndexOutOfBoundsException — if fromIndex < 0 or toIndex > a.length ,IllegalArgumentException — if fromIndex > toIndex

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 a double array
		double arr[] = new double[] { 10.2, 15.2, 20.2, 25.2, 30.2 };
		// Print the original array
		System.out.println("Original Array : ");
		for (double val : arr) {
			System.out.println("Value = " + val);
		}
		// Use fill to place 35.2 into the range index 1 to 4
		Arrays.fill(arr, 1, 4, 35.2);
		// Print the new array
		System.out.println("\nNew Array is : ");
		for (double 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 a double array

double arr[] = new double[] { 10.2, 15.2, 20.2, 25.2, 30.2 };

// Print the original array

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

for (double val : arr) {

System.out.println("Value = " + val);

}

// Use fill to place 35.2 into the range index 1 to 4

Arrays.fill(arr, 1, 4, 35.2);

// Print the new array

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

for (double val : arr) {

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

}

Output of Program :

Original Array : 
Value = 10.2
Value = 15.2
Value = 20.2
Value = 25.2
Value = 30.2
New Array is : 
New element is 10.2
New element is 35.2
New element is 35.2
New element is 35.2
New element is 30.2

Original Array :

Value = 10.2

Value = 15.2

Value = 20.2

Value = 25.2

Value = 30.2

New Array is :

New element is 10.2

New element is 35.2

New element is 30.2

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