Initializing a boolean array in java with an example program

• Initializing a boolean variable : boolean b=true;
• In some cases we need to initialize all values of boolean array with true or false.
• In such cases we can use Arrays.fill() method
• Arrays.fill(array, Boolean.FALSE);
• java initialize boolean array with true:  Arrays.fill(array, Boolean.FALSE);
• Lets see an example java program on how to assign or initialize boolean array with false or true values.

#1: Java Example program on initializing boolean array.

1. package com.instanceofjava;
2. 
   
3. import java.util.Arrays;
4. /**
5.  * @author www.Instanceofjava.com
6.  * @category interview questions
7.  * 
8.  * Description: Initialize boolean array values with false or true
9.  *
10.  */
11. public class InitializeBoolean {
12. 
    
13. public static void main(String[] args) {
15. Boolean[] array = new Boolean[4];
16. //initially all values will be null
17. for (int i = 0; i < array.length; i++) {
18. System.out.println(array[i]);
19. }
20. Arrays.fill(array, Boolean.FALSE);
21. // all values will be false
22. for (int i = 0; i < array.length; i++) {
23. System.out.println(array[i]);
24. }
26. Arrays.fill(array, Boolean.TRUE);
27. // all values will be false
28. for (int i = 0; i < array.length; i++) {
29. System.out.println(array[i]);
30. }
31. }
32. 
    
33. }

Output:

1. null
2. null
3. null
4. null
5. false
6. false
7. false
8. false
9. true
10. true
11. true
12. true