Fill a Character Array using Index in Java

Declaration :

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

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

Explanation :

Purpose	The java.util.Arrays.fill(char[] a int fromIndex int toIndex char val) method assigns the specified char value to each element of the specified range of the specified array of chars. 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 character array
		char arr[] = new char[] { 'a', 'b', 'c', 'd', 'e' };
		// Print the original array
		System.out.println("Original Array : ");
		for (char val : arr) {
			System.out.println("Original element is " + val);
		}
		// Use fill to place p in the range index 1 to 4
		Arrays.fill(arr, 1, 4, 'p');
		// Print the new array
		System.out.println("\nNew array is : ");
		for (char 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 character array

char arr[] = new char[] { 'a', 'b', 'c', 'd', 'e' };

// Print the original array

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

for (char val : arr) {

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

}

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

Arrays.fill(arr, 1, 4, 'p');

// Print the new array

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

for (char val : arr) {

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

}

Output of Program :

Original Array : 
Original element is a
Original element is b
Original element is c
Original element is d
Original element is e
New array is : 
New element is a
New element is p
New element is p
New element is p
New element is e

Original Array :

Original element is a

Original element is b

Original element is c

Original element is d

Original element is e

New array is :

New element is a

New element is p

New element is e

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