Java Arrays fill(boolean[], boolean) Method

Description

The Java Arrays fill(boolean[] a, boolean val) method assigns the specified boolean value to each element of the specified array of booleans.

Declaration

Following is the declaration for java.util.Arrays.fill(boolean[] a, boolean val) method

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

Parameters

  • a − This is the array to be filled.

  • val − This is the value to be stored in all elements of the array.

Return Value

This method does not return any value.

Exception

NA

Java Arrays fill(boolean[] a, int fromIndex, int toIndex, boolean val) Method

Description

The Java Arrays fill(boolean[] a, int fromIndex, int toIndex, boolean val) method assigns the specified boolean value to each element of the specified range of the specified array of booleans.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(boolean[] a, int fromIndex, int toIndex, boolean val) method

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

Filling the Array of booleans with Given Values Example

The following example shows the usage of Java Arrays fill(boolean[], boolean) method. First, we've created an array of booleans and its elements are printed. Using fill(boolean[], boolean) method, we're filling the array with a give value and then updated array elements are printed again.

package com.tutorialspoint;

import java.util.Arrays;

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

      // initializing boolean array
      boolean arr[] = new boolean[] {true, true, false};

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

      // using fill for placing false
      Arrays.fill(arr, false);

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

Output

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

Actual values:
Value = true
Value = true
Value = false
New values after using fill() method:
Value = false
Value = false
Value = false

Filling the Sub-Array of booleans with Given Values Example

The following example shows the usage of Java Arrays fill(boolean[], int, int, boolean) method. First, we've created an array of booleans and its elements are printed. Using fill(boolean[], int, int, boolean) method method, we're filling the array with a give value and then updated array elements are printed again.

package com.tutorialspoint;

import java.util.Arrays;

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

      // initializing boolean array
      boolean arr[] = new boolean[] {true, true, true};

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

      // using fill for placing false from index 0 to 3
      Arrays.fill(arr, 0, 3, false);

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

Output

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

Actual values: 
Value = true
Value = true
Value = true
New values after using fill() method: 
Value = false
Value = false
Value = false

Filling the Sub-Array of booleans with Given Values Example

The following example shows the usage of Java Arrays fill(boolean[], int, int, boolean) method. First, we've created an array of booleans and its elements are printed. Using fill(boolean[], int, int, boolean) method method, we're filling the subarray of array with a give value and then updated array elements are printed again.

package com.tutorialspoint;

import java.util.Arrays;

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

      // initializing boolean array
      boolean arr[] = new boolean[] {true, true, true};

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

      // using fill for placing false from index 0 to 2
      Arrays.fill(arr, 0, 2, false);

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

Output

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

Actual values: 
Value = true
Value = true
Value = true
New values after using fill() method: 
Value = false
Value = false
Value = true
java_util_arrays.htm
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