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How to fill (initialize at once) an array in Java
Problem Description
How to fill (initialize at once) an array?
Solution
This example fill (initialize all the elements of the array in one short) an array by using Array.fill(arrayname,value) method and Array.fill(arrayname, starting index, ending index, value) method of Java Util class.
import java.util.*; public class FillTest { public static void main(String args[]) { int array[] = new int[6]; Arrays.fill(array, 100); for (int i = 0, n = array.length; i < n; i++) { System.out.println(array[i]); } System.out.println(); Arrays.fill(array, 3, 6, 50); for (int i = 0, n = array.length; i < n; i++) { System.out.println(array[i]); } } }
Result
The above code sample will produce the following result.
100 100 100 100 100 100 100 100 100 50 50 50
Another sample example of array filling
import java.util.Arrays; public class HelloWorld { public static void main(String[] args) { // initializing int array int arr[] = new int[] {1, 6, 3, 2, 9}; // let us print the values System.out.println("Actual values: "); for (int value : arr) { System.out.println("Value = " + value); } // using fill for placing 18 Arrays.fill(arr, 18); // let us print the values System.out.println("New values after using fill() method: "); for (int value : arr) { System.out.println("Value = " + value); } } }
The above code sample will produce the following result.
Actual values: Value = 1 Value = 6 Value = 3 Value = 2 Value = 9 New values after using fill() method: Value = 18 Value = 18 Value = 18 Value = 18 Value = 18
java_arrays.htm
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