Cleanest way to toggle a boolean variable in Java

Question

Is there a better way to negate a boolean in Java than a simple if-else   if  theBoolean        theBoolean   false    else       theBoolean   true

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Before   boolean result   isresult    if  result        result   false    else       result   true      After   boolean result   isresult    result    true

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theBoolean    theBoolean

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theBoolean    true    Fewer keystrokes if your variable is longer than four letters  Edit  code tends to return useful results when used as Google search terms  The code above doesn t  For those who need it  it s bitwise XOR as described here

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There are several  The  obvious  way  for most people   theBoolean    theBoolean    The  shortest  way  most of the time   theBoolean    true    The  most visual  way  most uncertainly   theBoolean   theBoolean   false   true    Extra  Toggle and use in a method call  theMethod  theBoolean    true      Since the assignment operator always returns what has been assigned  this will toggle the value via the bitwise operator  and then return the newly assigned value to be used in the method call

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theBoolean    theBoolean

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Before   boolean result   isresult    if  result        result   false    else       result   true      After   boolean result   isresult    result    true

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The class BooleanUtils supportes the negation of a boolean  You find this class in commons-lang commons-lang   BooleanUtils negate theBoolean

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If you re not doing anything particularly professional you can always use a Util class  Ex  a util class from a project for a class   public class Util     public Util      public boolean flip boolean bool    return  bool    public void sop String str    System out println str          then just create a Util object  Util u   new Util    and have something for the return System out println  u flip bool      If you re gonna end up using the same thing over and over  use a method  and especially if it s across projects  make a Util class  Dunno what the industry standard is however   Experienced programmers feel free to correct me

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The class BooleanUtils supportes the negation of a boolean  You find this class in commons-lang commons-lang   BooleanUtils negate theBoolean

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Unfortunately  there is no short form like numbers have increment decrement  i    I would like to have similar short expression to invert a boolean  dmth like  isEmpty

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theBoolean    theBoolean

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theBoolean    true    Fewer keystrokes if your variable is longer than four letters  Edit  code tends to return useful results when used as Google search terms  The code above doesn t  For those who need it  it s bitwise XOR as described here

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theBoolean    theBoolean

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This answer came up when searching for  java invert boolean function   The example below will prevent certain static analysis tools from failing builds due to branching logic  This is useful if you need to invert a boolean and haven t built out comprehensive unit tests     Boolean valueOf aBool  equals false    or alternatively   Boolean FALSE equals aBool    or   Boolean FALSE  equals

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If you use Boolean NULL values and consider them false  try this   static public boolean toggle Boolean aBoolean        if  aBoolean    null  return true      else return  aBoolean      If you are not handing Boolean NULL values  try this   static public boolean toggle boolean aBoolean       return  aBoolean      These are the cleanest because they show the intent in the method signature  are easier to read compared to the   operator  and can be easily debugged   Usage  boolean bTrue   true boolean bFalse   false boolean bNull   null  toggle bTrue        false toggle bFalse        true toggle bNull        true   Of course  if you use Groovy or a language that allows extension methods  you can register an extension and simply do   Boolean b   false b   b toggle         true

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Unfortunately  there is no short form like numbers have increment decrement  i    I would like to have similar short expression to invert a boolean  dmth like  isEmpty

User · Answer

theBoolean    true    Fewer keystrokes if your variable is longer than four letters  Edit  code tends to return useful results when used as Google search terms  The code above doesn t  For those who need it  it s bitwise XOR as described here

User · Answer

If you use Boolean NULL values and consider them false  try this   static public boolean toggle Boolean aBoolean        if  aBoolean    null  return true      else return  aBoolean      If you are not handing Boolean NULL values  try this   static public boolean toggle boolean aBoolean       return  aBoolean      These are the cleanest because they show the intent in the method signature  are easier to read compared to the   operator  and can be easily debugged   Usage  boolean bTrue   true boolean bFalse   false boolean bNull   null  toggle bTrue        false toggle bFalse        true toggle bNull        true   Of course  if you use Groovy or a language that allows extension methods  you can register an extension and simply do   Boolean b   false b   b toggle         true

User · Answer

theBoolean    true    Fewer keystrokes if your variable is longer than four letters  Edit  code tends to return useful results when used as Google search terms  The code above doesn t  For those who need it  it s bitwise XOR as described here

User · Answer

There are several  The  obvious  way  for most people   theBoolean    theBoolean    The  shortest  way  most of the time   theBoolean    true    The  most visual  way  most uncertainly   theBoolean   theBoolean   false   true    Extra  Toggle and use in a method call  theMethod  theBoolean    true      Since the assignment operator always returns what has been assigned  this will toggle the value via the bitwise operator  and then return the newly assigned value to be used in the method call

User · Answer

This answer came up when searching for  java invert boolean function   The example below will prevent certain static analysis tools from failing builds due to branching logic  This is useful if you need to invert a boolean and haven t built out comprehensive unit tests     Boolean valueOf aBool  equals false    or alternatively   Boolean FALSE equals aBool    or   Boolean FALSE  equals

User · Answer

If you re not doing anything particularly professional you can always use a Util class  Ex  a util class from a project for a class   public class Util     public Util      public boolean flip boolean bool    return  bool    public void sop String str    System out println str          then just create a Util object  Util u   new Util    and have something for the return System out println  u flip bool      If you re gonna end up using the same thing over and over  use a method  and especially if it s across projects  make a Util class  Dunno what the industry standard is however   Experienced programmers feel free to correct me

[java] Cleanest way to toggle a boolean variable in Java?

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