3 Ways To Convert String To Boolean Inwards Java? Examples

You tin order notice convert a String object to Boolean object or boolean primitive past times using the Boolean.valueOf() as well as Boolean.parseBoolean() method. The steps are similar rot converting to String to other information types e.g. String to Integer as well as String to Long. You tin order notice role valueOf() method to convert String to Boolean object as well as parseBoolean() method to convert given String to boolean primitive value. Internally, valueOf() every bit good uses parseBoolean() for parsing String but on summit of that it every bit good provides caching e.g. it tin order notice render Boolean.TRUE as well as Boolean.FALSE cached value for "true" as well as "false" string.  In fact, the Boolean.TRUE is returned solely when String is equal to truthful ignoring instance e.g. "True", "true", "TRUE" volition evaluate into boolean true, thence Boolean.TRUE volition endure returned. For string similar "Yes", Boolean.FALSE volition endure returned. We'll verbalize over the rules of String to boolean conversion inwards adjacent section.

1. Rules of String to Boolean Conversion inwards Java

The parsing logic is encapsulated inwards parseBoolean() method which is every bit good leveraged or used past times valueOf(). According to this logic, the parseBoolean() method render truthful if given String is non null as well as equal to truthful ignoring instance as well as faux otherwise. For example, "true", "True", as well as "TRUE" all volition render Boolean.TRUE value but "Yes" volition render Boolean.FALSE. Similarly, "false", "False", or "FALSE" volition every bit good render Boolean.FALSE

Here are unopen to examples:

Boolean.parseBoolean("True") returns true.
Boolean.parseBoolean("TRUE") returns true.
Boolean.parseBoolean("true") returns true.
Boolean.parseBoolean("yes") returns false.
Boolean.parseBoolean("y") returns false.
Boolean.parseBoolean("no") returns false.
Boolean.parseBoolean("false") returns false.
Boolean.parseBoolean("False") returns false.
Boolean.parseBoolean("FALSE") returns false.

If you lot desire to know to a greater extent than virtually how to convert 1 information type to other inwards Java,  The Complete Java Masterclass is a skillful resources to larn it inwards depth.

2. Boolean.parseBoolean() Example

The parseBoolean() method is similar to parseInt() method as well as it returns a primitive boolean value later parsing given String. It returns a boolean value, truthful or faux based upon the rules given above. It compares String past times ignoring instance as well as solely render truthful if String matches truthful later ignoring cases.

Boolean.parseBoolean("True") returns true.
Boolean.parseBoolean("TRUE") returns true.
Boolean.parseBoolean("true") returns true.
Boolean.parseBoolean("yes") returns false.

You should role this method if you lot ask a primitive boolean value.

3. Boolean.valueOf() Example

This method should endure used to convert a String object to a Boolean object inwards Java. It leverages the parsing logic of parseooleBan() method but it every bit good uses the Flyweight pattern pattern to cache oftentimes used value as well as returns them.

Since boolean tin order notice either endure truthful or false, it but uses ii Boolean instances, Boolean.TRUE as well as Boolean.FALSE, for all String to Boolean conversion, which drastically reduces the release of objects as well as causes less overhead for Garbage collector.

Here are unopen to examples of converting String to Boolean using the valueOf() method:

Boolean.valueOf("True") returns Boolean.TRUE.
Boolean.valueOf("TRUE") returns Boolean.TRUE.
Boolean.valueOf("true") returns Boolean.TRUE.
Boolean.valueOf("yes") returns Boolean.FALSE.
Boolean.valueOf("y") returns Boolean.FALSE.
Boolean.valueOf("no") returns Boolean.FALSE.
Boolean.valueOf("false") returns Boolean.FALSE.
Boolean.valueOf("False") returns Boolean.FALSE.
Boolean.valueOf("FALSE") returns Boolean.FALSE.

You should role this method if you lot ask a Boolean object from String rather than boolean primitive value.  If you lot desire to know to a greater extent than virtually primitive information types inwards Java then Java 10 Boolean Documentation

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