What is the most elegant way to check if all values in a boolean array are true

Question

I have a boolean array in java    boolean   myArray   new boolean 10     What s the most elegant way to check if all the values are true

User · Answer

In Java 8   you can create an IntStream in the range of 0 to myArray length and check that all values are true in the corresponding  primitive  array with something like   return IntStream range 0  myArray length  allMatch i - gt  myArray i

User · Answer

This is probably not faster  and definitely not very readable  So  for the sake of colorful solutions     int i   array length  -1  for   i  gt  -1  amp  amp  array i   i--   return i  -1

User · Answer

It depends how many times you re going to want to find this information  if more than once   Set lt Boolean gt  flags   new HashSet lt Boolean gt  myArray   flags contains false     Otherwise a short circuited loop   for  i   0  i  lt  myArray length  i        if   myArray i   return false    return true

User · Answer

Arrays asList myArray  contains false

User · Answer

I can t believe there s no BitSet solution   A BitSet is an abstraction over a set of bits so we don t have to use boolean   for more advanced interactions anymore  because it already contains most of the needed methods  It s also pretty fast in batch operations since it internally uses long values to store the bits and doesn t therefore check every bit separately like we do with boolean     BitSet myBitSet   new BitSet 10      fills the bitset with ten true values myBitSet set 0  10     For your particular case  I d use cardinality     if  myBitSet cardinality      myBitSet size             do something  there are no false bits in the bitset       Another alternative is using Guava   return Booleans contains myArray  true

User · Answer

OK  This is the  most elegant  solution I could come up with on the fly   boolean allTrue    Arrays toString myArray  contains  f      Hope that helps

User · Answer

That line should be sufficient   BooleanUtils and boolean    array   but to calm the link-only purists      Performs an and on a set of booleans

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public static boolean areAllTrue boolean   array        for boolean b   array  if  b  return false      return true

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You can check all value items are true or false by compare your array with the other boolean array via Arrays equal method like below example     private boolean isCheckedAnswer List lt Answer gt  array        boolean   isSelectedChecks   new boolean array size         for  int i   0  i  lt  array size    i              isSelectedChecks i    array get i  isChecked               boolean   isAllFalse   new boolean array size         for  int i   0  i  lt  array size    i              isAllFalse i    false             return  Arrays equals isSelectedChecks  isAllFalse

User · Answer

In Java 8  you could do   boolean isAllTrue   Arrays asList myArray  stream   allMatch val - gt  val    true     Or even shorter   boolean isAllTrue   Arrays stream myArray  allMatch Boolean  valueOf     Note  You need Boolean   for this solution to work  Because you can t have a primitives List

User · Answer

boolean alltrue   true  for int i   0  alltrue  amp  amp  i lt booleanArray length    i       alltrue  amp   booleanArray i     I think this looks ok and behaves well

[java] What is the most elegant way to check if all values in a boolean array are true?

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