Array with boolean with no specified size

Vani4ka

I need an array from type boolean with no specified size at the beginning. In this case I usually use ArrayList, but it doesn't work for boolean type...

This works:

ArrayList<String> thisArray = new ArrayList<String>();

And this doesn't:

ArrayList<boolean> thisArray = new ArrayList<boolean>();

Can someone help? Thanks!

GoToLoop

• Java language has 8 primitive datatypes, which are also keywords: http://docs.Oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html
• Unfortunately we can't use primitive types on Java's containers like List, Map, Set, etc.
• Instead we use the corresponding wrapper class for that primitive type: http://docs.Oracle.com/javase/tutorial/java/data/autoboxing.html
• If you look up the table at the end of the article link above, you'll find out the corresponding wrapper class for primitive type boolean is Boolean:
  http://docs.Oracle.com/javase/8/docs/api/java/lang/Boolean.html

import java.util.List;
final List<Boolean> bools = new ArrayList<Boolean>();

for (int i = 0; i++ < 5; bools.add(random(1) < .5));
println(bools);

exit();

GoToLoop

There's also an alternative container class which saves much more RAM (at the expense of CPU) called BitSet: *-:) http://docs.Oracle.com/javase/8/docs/api/java/util/BitSet.html

import java.util.BitSet;
final BitSet bools = new BitSet();

for (int i = 0; i < 5; bools.set(i++, random(1) < .5));
for (int i = 0; i < 5; println(i, bools.get(i++)));

exit();