Array fill value

In this chapter you will learn:

1. How to fill value to an array
2. Fill an array of boolean value

Fill value to array

The following methods assigns the specified value to each element of the specified array.

• static void fill(boolean[] a, boolean val)
• static void fill(boolean[] a, int fromIndex, int toIndex, boolean val)
• static void fill(byte[] a, byte val)
• static void fill(byte[] a, int fromIndex, int toIndex, byte val)
• static void fill(char[] a, char val)
• static void fill(char[] a, int fromIndex, int toIndex, char val)
• static void fill(double[] a, double val)
• static void fill(double[] a, int fromIndex, int toIndex, double val)
• static void fill(float[] a, float val)
• static void fill(float[] a, int fromIndex, int toIndex, float val)
• static void fill(int[] a, int val)
• static void fill(int[] a, int fromIndex, int toIndex, int val)
• static void fill(long[] a, int fromIndex, int toIndex, long val)
• static void fill(long[] a, long val)
• static void fill(Object[] a, int fromIndex, int toIndex, Object val)
• static void fill(Object[] a, Object val)
• static void fill(short[] a, int fromIndex, int toIndex, short val)
• static void fill(short[] a, short val)

The following code fills an array of int.

import java.util.Arrays;
// j a v a 2  s  .com
public class Main{
  public static void main(String args[]) {
    int array[] = new int[10];
    for (int i = 0; i < 10; i++){
      array[i] = -3 * i;
    }
    System.out.print("Original contents: ");
    System.out.println(Arrays.toString(array));
    // fill and display
    Arrays.fill(array, 2, 6, -1);
    System.out.print("After fill(): ");
    System.out.println(Arrays.toString(array));
  }
}

The output:

Fill an array of boolean value

import java.util.Arrays;
/* j a va2s .  co m*/
public class Main {
  public static void main(String[] argv) throws Exception {

    boolean[] booleanArr = new boolean[10];
    boolean booleanFillValue = false;
    Arrays.fill(booleanArr, booleanFillValue);
  }
}

import java.util.Arrays;
/*from jav a  2 s .  c  o  m*/
public class Main {
  public static void main(String[] argv) throws Exception {
    int startIndex = 0;
    int endIndex = 4;

    boolean[] booleanArr = new boolean[10];
    boolean booleanFillValue = true;

    Arrays.fill(booleanArr, startIndex, endIndex, booleanFillValue);

    System.out.println(Arrays.toString(booleanArr));
  }
}

The output:

Next chapter...

What you will learn in the next chapter:

1. How to convert array to string in Java
2. How to convert multi-dimensional array to string

Java Array

Create an Array

Array Index and length

Multidimensional Arrays

Array examples

Array copy

Array compare

Array Binary search

Array Search

Array sort

Array to List

Convert array to Set

Array fill value

Array to String

Array element reverse

Array element delete

Array shuffle

Array element append

Array min / max value

Sub array search

Get Sub array

Array dimension reflection

Array clone