Java.util.Arrays.fill() Method

Description

The java.util.Arrays.fill(object[] a, int fromIndex, int toIndex, object val) method assigns the specified Object reference to each element of the specified range of the specified array of objects. The range to be filled extends from index fromIndex, inclusive, to index toIndex, exclusive.(If fromIndex==toIndex, the range to be filled is empty.).

Declaration

Following is the declaration for java.util.Arrays.fill() method

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

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

• ArrayStoreException − if the specified value is not of a runtime type that can be stored in the specified array.

Example

The following example shows the usage of java.util.Arrays.fill() method.

package com.tutorialspoint;

import java.util.Arrays;

public class ArrayDemo {
   public static void main(String[] args) {

      // initializing object array
      Object arr[] = new Object[] {1.2, 5.6, 3.4, 2.9, 9.7};

      // let us print the values
      System.out.println("Actual values: ");
      for (Object value : arr) {
         System.out.println("Value = " + value);
      }

      // using fill for placing 12.2 from index 1 to 3
      Arrays.fill(arr, 1, 3, 12.2);

      // let us print the values
      System.out.println("New values after using fill() method: ");
      for (Object value : arr) {
         System.out.println("Value = " + value);
      }
   }
} 

Let us compile and run the above program, this will produce the following result −

Actual values:
Value = 1.2
Value = 5.6
Value = 3.4
Value = 2.9
Value = 9.7
New values after using fill() method:
Value = 1.2
Value = 12.2
Value = 12.2
Value = 2.9
Value = 9.7