BooleanvalueOfboolean

Boolean.valueOf(boolean) is a static method in the Java standard library class java.lang.Boolean. It returns a Boolean object representing the specified primitive boolean value.

When invoked, the method returns one of two cached objects: Boolean.TRUE if the argument is true, or Boolean.FALSE if the argument is false. Unlike constructing a new Boolean object, valueOf reuses these predefined instances, avoiding unnecessary object creation and reducing memory usage.

This behavior makes valueOf the preferred way to convert a primitive boolean to its wrapper type, especially in contexts involving autoboxing. For example, Boolean b = flag; may internally use Boolean.valueOf(flag) rather than new Boolean(flag).

Because Boolean objects are immutable, the cached instances are safe to share across threads without synchronization concerns. The method’s signature is public static Boolean valueOf(boolean b), returning a Boolean.

Related methods include Boolean.valueOf(String), which parses a string into a Boolean, typically returning true when the string equalsIgnoreCase("true") and false otherwise. Understanding valueOf(boolean) helps explain why autoboxing and wrapper creation typically avoid the overhead of explicit constructors for booleans.

In summary, Boolean.valueOf(boolean) provides an efficient, canonical way to obtain Boolean wrapper instances for primitive boolean values by reusing cached objects rather than creating new ones.