Java Arrays - fill() Method

The java.util.Arrays.fill() method is used to assign the specified Object reference to each element of the specified range of the specified array of Objects.

Syntax

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

Parameters

Return Value

void type.

Exception

• Throws IllegalArgumentException, if fromIndex > toIndex.
• Throws ArrayIndexOutOfBoundsException, if fromIndex < 0 or toIndex > a.length.
• Throws ArrayStoreException, if the specified value is not of a runtime type that can be stored in the specified array.

Example:

In the example below, the java.util.Arrays.fill() method is used to fill the specified range in the specified array of objects with specified object reference.

import java.util.*;

public class MyClass {
  public static void main(String[] args) {
    //creating an Object array
    Object MyArr[] = {10, 2, -3, 35, 56};

    //printing array
    System.out.print("MyArr contains:"); 
    for(Object i: MyArr)
      System.out.print(" " + i);

    //fill the specified range of the array 
    //object with 5 Object value
    Arrays.fill(MyArr, 1, 4, 5);

    //printing array
    System.out.print("\nMyArr contains:"); 
    for(Object i: MyArr)
      System.out.print(" " + i);   
  }
}

The output of the above code will be:

MyArr contains: 10 2 -3 35 56
MyArr contains: 10 5 5 5 56