I am studying java and wanted to know what's the usage of static final
variables in application designing. Please provide some examples too.
Where are static final variables used in java?
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final
means the reference can't be changed once it's set. static
means the variable belongs to a class, not a specific instance. This combination of modifiers, especially when used on a primitive or an immutable class (such as String
) are often used to represent constants. A classic example would be java.io.File.separtorChar
.
Uses of a
static final
variable :Integer
class defines a constant calledMIN_VALUE
as :public static final int MIN_VALUE = 0x80000000;
public static final
reference.When you mark a variable defined in a class as
static
, it is shared across all the instances of aclass
. When you mark a variable in a class asfinal
, it can only be initialized once either on the same line as the declaration of the variable or in the constructor of the class. Putting both together, a memberstatic final
variable is shared across all instances of aclass
, must be initialized where it is declared, and cannot be modified once declared.