Java Utility Library

Java Arrays - fill() Method



The java.util.Arrays.fill() method is used to assign the specified boolean value to each element of the specified range of the specified array of booleans.

Syntax

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

Parameters

a Specify the array to be filled.
fromIndex Specify the index of the first element (inclusive) to be filled with the specified value.
toIndex Specify the index of the last element (exclusive) to be filled with the specified value.
val Specify the value to be stored in all elements of the array.

Return Value

void type.

Exception

  • Throws IllegalArgumentException, if fromIndex > toIndex.
  • Throws ArrayIndexOutOfBoundsException, if fromIndex < 0 or toIndex > a.length.

Example:

In the example below, the java.util.Arrays.fill() method is used to fill a specified range of a given boolean array with a specified boolean value.

import java.util.*;

public class MyClass {
  public static void main(String[] args) {
    //creating a boolean array
    boolean MyArr[] = {true, false, false, true, false};

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

    //fill the specified range of the array 
    //with true boolean value
    Arrays.fill(MyArr, 1, 4, true);

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

The output of the above code will be:

MyArr contains: true false false true false
MyArr contains: true true true true false

❮ Java.util - Arrays