Java - Convert String To Boolean Example

There are two ways to convert a String to boolean inward Java, first, yesteryear using Boolean.parseBoolean() method too second, yesteryear using Boolean.valueOf() method.The parseBoolean() method returns an equivalent boolean value of given String, for example, if yous overstep "true" it volition render the primitive boolean value true. Similarly, if yous overstep "false" it volition render false. The proficient affair near this method is that it is instance insensitive, which agency if yous overstep "true", "TRUE", or "True" yous volition all the same acquire a true boolean value.

 Another proficient affair near this method is that it doesn't throw an exception if yous overstep whatsoever String value other than true too false. For example, if yous overstep "YES" it volition render false, which is non obvious but that's all the same amend than throwing an exception similar NumberFormatException.

The Boolean.valueOf() method piece of occupation similar, it returns a truthful boolean value for a non-null String equal to true, ignoring instance too returns fake for everything else. It likewise returns a Boolean object instead of a primitive boolean value.

Also, both valueOf() too parseBoolean() methods are aught safe, which agency they volition render fake if yous overstep aught i.e. parseBoolean(null) too valueOf(null) volition render fake instead of throwing NullPointerExcpeiton.

1. Boolean.parseBoolean() Examples


// parseBoolean returns a boolean primitive value String value = "true"; boolean b = Boolean.parseBoolean(value); System.out.println(b);  Output true


2. Boolean.valueOf() Examples


// valueOf returns a Boolean object String data = "false"; boolean f = Boolean.valueOf(data); System.out.println(f); Output false


Btw, at that topographic point is or thus other way to convert String to Boolean inward Java, yesteryear using the constructor of Boolean bird e.g. new Boolean(String input) but I won't propose yous to operate that because everytime yous volition operate this method it volition render a novel Boolean Object.

Instead, yous should ever operate valueOf() method because Boolean instances are immutable too only 2 instances are plenty to encompass all scenarios.

Even Joshua Bloch has advised using prefer static manufactory method similar valueOf() over constructor inward his classic Effective Java mass for functioning too liberate coupling. If yous are interested, run into the Item 1 on Effective Java tertiary Edition to acquire to a greater extent than near it.

two ways to convert a String to boolean inward Java Java - Convert String to Boolean Example




Difference betwixt parseBoolean too valueOf() inward Java

Even though both methods tin move used to parse a String to a boolean value, at that topographic point is a slight departure betwixt them. The parseBoolean() method returns a primitive boolean value spell the valueOf() returns a Boolean object.

Though inward the historic menstruum of auto-boxing, a Boolean tin easily move stored inward a boolean variable, this is an of import departure which yous should remember.

Another practise goodness of using the valueOf() method is that it caches the boolean value too returns the already created Boolean.TRUE too Boolean.FALSE value instead of creating a novel instance every time.

If yous don't involve a novel instance of the Boolean object thus yous should ever operate Boolean.valueOf() method to practise Boolean objects to acquire amend performance.

This method is likewise overloaded to practise a Boolean object from both Strings equally good equally primitive boolean value e.g. both valueOf(true) too valueOf("true") will render same Boolean.TRUE object. See The Complete Java Masterclass for to a greater extent than details.

In short:
two ways to convert a String to boolean inward Java Java - Convert String to Boolean Example



Java Program to Convert String to Boolean

Here is our consummate Java programme to convert String to Boolean inward Java. It's quite similar to the before programme for converting String to Integer, Long, Double, Float, Short, too Byte inward Java. All of them follow same technique to convert String to other information types. 

/**  *   * Influenza A virus subtype H5N1 unproblematic representative to convert String to Boolean inward Java  */ public class Hello {    public static void main(String args[]) {      // parseBoolean returns a boolean primitive value     String value = "true";     boolean b = Boolean.parseBoolean(value);     System.out.println(b);      // valueOf returns a Boolean object     String data = "false";     boolean f = Boolean.valueOf(data);     System.out.println(f);      value = "NO";     b = Boolean.parseBoolean(value);     System.out.println(b);      // aught String volition render false     System.out.println(Boolean.parseBoolean(null));     System.out.println(Boolean.valueOf(null));      // whatsoever value other than truthful (Case-insensitive) will     // render false     System.out.println(Boolean.parseBoolean("YES"));     System.out.println(Boolean.valueOf("Y"));   } }  Output true false false false false false false 

Important Points

Some of import points near parseBoolean too valueOf methods which are worth remembering:

1. Both parseBoolean() too valueOf() are static methods defined inward java.lang.Boolean class.

2. The parseBoolean() returns a primitive boolean value spell valueOf() returns a Boolean object.

3. Both parseBoolean() too valueOf() are null-safe which agency if yous overstep aught String to them they volition render fake boolean value instead of throwing NullPointerException.

4. Both methods are likewise case-insensitive, which agency "true", "TRUE", too "True" volition render same Boolean.TRUE value.

5. Prefer valueOf() over parseBoolean() if yous involve Boolean object because it returns cached Boolean objects, defined inward the Boolean bird itself i.e. Boolean.TRUE for truthful too Boolean.FALSE for false.

6. The valueOf() provides amend functioning because of caching.

7. Autoboxing boolean primitive to Boolean object likewise uses the Boolean.valueOf() method.


That's all near how to convert a String to boolean inward Java. You should operate the Boolean.parseBoolean() method if yous involve a primitive boolean value too Boolean.valueOf() if yous involve a Boolean object. The valueOf() method likewise supply amend functioning because it ever returns the 2 pre-created instance i.e. Boolean.TRUE too Boolean.FALSE instead of creating a novel object everytime yous parse a String to boolean.

Further Learning

Thanks for reading this article. If yous similar this tutorial thus delight part amongst your friends too colleagues. If yous bring whatsoever questions or feedback thus delight drib a note. 

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