if boolean condition in Java

Question

This is always very confusing to me  Can someone please explain it  The confusion I have is - boolean default to false  So in the below example  does it enter the if loop when state is not turned on  i e   it is TURNED OFF if  condition is false  OR does it enter the if loop when state is TURNED ON  in other words if  condition is true    boolean turnedOn  if  turnedOn          do stuff when the condition is false or true    else         do else of if     I know this is a very basic question  but if you could explain the answer in very basic language  that would be great     Feel free to point me to duplicate posts that have a very good explanation  I did not find one where I could clearly get it   Also feel free to change the subject of the post if you d like to make it more generic

User · Answer

The syntax of if block is as below   if condition      Executes when condition evaluates to true    else     Executes when condition evaluates to false      In your case you are directly passing a boolean value so no evaluation is required

User · Answer

boolean state    TURNED ON     is not a Java valid code  boolean can receive only boolean values  true or false  and  TURNED ON is a String   EDIT   now you are talking about a loop and your code does not contain any  your var state is false because the boolean default value and you execute the else clause

User · Answer

In your example  the IF statement will run when it is state   true meaning the else part will run when state   false    if turnedOn    true  is the same as if turnedOn   if turnedOn    false  is the same as if  turnedOn    If you have   boolean turnedOn   false    Or  boolean turnedOn    Then  if turnedOn       else          This would run

User · Answer

This is how the if behaves   if turnedOn     This turnedOn should be a boolean or you could have a condition here which would give a boolean result       It will come here if turnedOn is true  i e  the condition in the  if  evaluates to true   else      It will come here if turnedOn is false  i e  the condition in the  if  evaluates to false

User · Answer

Booleans default value is false only for classes  fields  If within a method  you have to initialize your variable by true or false  Thus for example in your case  you ll have a compilation error   Moreover  I don t really get the point  but the only way to enter within a if is to evaluate the condition to true

User · Answer

if  turnedOn          do stuff when the condition is false or true    else         do else of if     It can be written like   if  turnedOn    true              do stuff when the condition is false or true        else      turnedOn    false or  turnedOn           do else of if     So if your turnedOn variable is true  if will be called  if is assigned to false  else will be called  boolean values are implicitly assigned to false if you won t assign them explicitly e q  turnedOn   true

User · Answer

boolean turnedOn      if turnedOn              do stuff when the condition is true - i e  turnedOn is true           else             do stuff when the condition is false - i e  turnedOn is false

User · Answer

Suppose you want to check a boolean  If true  do something  Else  do something else  You can write   if condition  true      else      else means this checks for the opposite of what you checked at if      instead of that  you can do it simply like    if condition      this will check if condition is true     else        Inversely  If you were to do something if condition was false and do something else if condition was true  Then you would write   if condition  true       if condition false     else       But following the simple path  We do   if  condition      it reads out as  if condition is not true  Which means if condition is false right     else       Think about it  You ll get it in no time

User · Answer

Okay  so       As you already stated  you know that a boolean defaults to false  boolean turnedOn  if turnedOn     Here  you are saying  if turnedOn  is true  that s implicit      then do this   else    if it is NOT true  it is false      do this     Does it make more sense now   The if statement will evaluate whatever code you put in it that returns a boolean value  and if the evaluation returns true  you enter the first block  Else  if the value is not true  it will be false  because a boolean can either be true or false  it will enter the - yep  you guessed it - the else    block   A more verbose example   If I am asked  are you hungry    the simple answer is yes  true   or no  false    boolean isHungry   true     I am always hungry dammit  if isHungry       Yes  I am hungry        Well  you should go grab a bite to eat then    else      No  not really        Ah  good for you  More food for me         As if this would ever happen - bad example  sorry

User · Answer

Assuming state is having a valid boolean value set in your actual code  then the following condition will succeed  if state    when state is boolean value is TRUE  If condition checks for the expression whether it is evaluated to TRUE FALSE  If the expression is simple true then the condition will succeed

User · Answer

ABoolean  with a uppercase  B   is a Boolean object  which if not assigned a value  will default to null  boolean  with a lowercase  b   is a boolean primitive  which if not assigned a value  will default to false   Boolean objectBoolean  boolean primitiveBoolean   System out println objectBoolean      will print  null  System out println primitiveBoolean      will print  false    Citation  so in your code because boolean with small  b  is declared it will set to false hence  boolean turnedOn      if turnedOn    meaning true               do stuff when the condition is false or true            else             do else of if    itwill do this part bechae it is false         the if turnedon  tests a value if true  you didnt assign a value for turned on making it false  making it do the else statement

[java] if (boolean condition) in Java

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