How to convert String object to Boolean Object

Question

How to convert String object to Boolean object

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We created soyuz-to library to simplify this problem (convert X to Y). It's just a set of SO answers for similar questions. This might be strange to use the library for such a simple problem, but it really helps in a lot of similar cases.

import io.thedocs.soyuz.to;

Boolean aBoolean = to.Boolean("true");

Please check it - it's very simple and has a lot of other useful features

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Use the Apache Commons library BooleanUtils class  String   values  new String    quot y quot   quot Y quot   quot n quot   quot N quot   quot Yes quot   quot YES quot   quot yes quot   quot no quot   quot No quot   quot NO quot   quot true quot   quot false quot   quot True quot   quot False quot   quot TRUE quot   quot FALSE quot  null   for String booleanStr   values       System out println  quot Str   quot   booleanStr   quot   boolean   quot   BooleanUtils toBoolean booleanStr       Result  Str  N  boolean  false Str  Yes  boolean  true Str  YES  boolean  true Str  yes  boolean  true Str  no  boolean  false Str  No  boolean  false Str  NO  boolean  false Str  true  boolean  true Str  false  boolean  false Str  True  boolean  true Str  False  boolean  false Str  TRUE  boolean  true Str  FALSE  boolean  false Str  null  boolean  false

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Why not use a regular expression    public static boolean toBoolean  String target         if  target    null   return false      return target matches     i   1 true yes oui vrai y

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This is how I did it    1  true  contains  string    For my case is mostly either 1 or true  I use hashes as dividers

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Boolean b   Boolean valueOf string     The value of b is true if the string is not a null and equal to true  ignoring case

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boolean b   string equalsIgnoreCase  true

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To get the boolean value of a String  try this   public boolean toBoolean String s        try           return Boolean parseBoolean s      Successfully converted String to boolean       catch Exception e            return null     There was some error  so return null            If there is an error  it will return null  Example   toBoolean  true       Returns true toBoolean  tr u e       Returns null

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you can directly set boolean value equivalent to any string by System class and access it anywhere    System setProperty  n   false    System setProperty  y   true     System setProperty  yes   true         System setProperty  no   false     System out println Boolean getBoolean  n         false System out println Boolean getBoolean  y         true     System out println Boolean getBoolean  no        false System out println Boolean getBoolean  yes        true

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Visit http   msdn microsoft com en-us library system boolean parse aspx This will give you an idea of what to do  This is what I get from the Java documentation   Method Detail parseBoolean public static boolean parseBoolean String s  Parses the string argument as a boolean  The boolean returned represents the value true if the string argument is not null and is equal  ignoring case  to the string  quot true quot   Parameters  s - the String containing the boolean representation to be parsed Returns  the boolean represented by the string argument Since  1 5

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public static boolean stringToBool String s            s   s toLowerCase            Set lt String gt  trueSet   new HashSet lt String gt  Arrays asList  1    true    yes             Set lt String gt  falseSet   new HashSet lt String gt  Arrays asList  0    false    no              if  trueSet contains s               return true          if  falseSet contains s               return false           throw new IllegalArgumentException s     is not a boolean             My way to convert string to boolean

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Use  isBool in your String value  It work for me your string isBool

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Beside the excellent answer of KLE  we can also make something more flexible   boolean b   string equalsIgnoreCase  true      string equalsIgnoreCase  t               string equalsIgnoreCase  yes      string equalsIgnoreCase  y               string equalsIgnoreCase  sure      string equalsIgnoreCase  aye               string equalsIgnoreCase  oui      string equalsIgnoreCase  vrai       inspired by zlajo s answer     -

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Try  depending on what result type you want    Boolean boolean1   Boolean valueOf  true    boolean boolean2   Boolean parseBoolean  true      Advantage     Boolean  this does not create new instances of Boolean  so performance is better  and less garbage-collection   It reuses the two instances of either Boolean TRUE or Boolean FALSE  boolean  no instance is needed  you use the primitive type    The official documentation is in the Javadoc     UPDATED    Autoboxing could also be used  but it has a performance cost  I suggest to use it only when you would have to cast yourself  not when the cast is avoidable

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Well  as now in Jan  2018  the best way for this is to use apache s BooleanUtils toBoolean   This will convert any boolean like string to boolean  e g  Y  yes  true  N  no  false  etc   Really handy

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You have to be carefull when using Boolean valueOf string  or Boolean parseBoolean string   The reason for this is that the methods will always return false if the String is not equal to  true   the case is ignored    For example    Boolean valueOf  YES   - gt  false   Because of that behaviour I would recommend to add some mechanism to ensure that the string which should be translated to a Boolean follows a specified format   For instance   if  string equalsIgnoreCase  true      string equalsIgnoreCase  false          Boolean valueOf string         do something      else          throw some exception

[java] How to convert String object to Boolean Object?

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