Fill an Integer Array using Index in Java

Declaration :

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

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

Explanation :

Purpose	The java.util.Arrays.fill(int[] a int fromIndex int toIndex int val) method assigns the specified intvalue to each element of the specified range of the specified array of ints. 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 an integer array
		int arr[] = new int[] { 10, 20, 30, 40, 50 };
		// Print the original array
		System.out.println("Original Array : ");
		for (int val : arr) {
			System.out.println("Original element is " + val);
		}
		// Use fill to place 5 in the range index 1 to 4
		Arrays.fill(arr, 1, 4, 5);
		// Print the new array
		System.out.println("\nNew Array is : ");
		for (int 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 integer array

int arr[] = new int[] { 10, 20, 30, 40, 50 };

// Print the original array

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

for (int val : arr) {

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

}

// Use fill to place 5 in the range index 1 to 4

Arrays.fill(arr, 1, 4, 5);

// Print the new array

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

for (int val : arr) {

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

}

Output of Program :

Original Array : 
Original element is 10
Original element is 20
Original element is 30
Original element is 40
Original element is 50
New Array is : 
New element is 10
New element is 5
New element is 5
New element is 5
New element is 50

Original Array :

Original element is 10

Original element is 20

Original element is 30

Original element is 40

Original element is 50

New Array is :

New element is 10

New element is 5

New element is 50

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