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member variable in an interface | ||||
subject | fact |
member variable in an interface | is a subtopic of Interfaces | |
is a kind of member variable | ||
must be static and final | ||
member variable | can be declared anywhere in a class outside of a method | |
can be initialized by an assignment statement | ||
is a member of a class or an object | ||
is accessible to the code in its class | ||
variable | can be accessed by other variables and methods in any class in the same package by default | |
can contain different classes of objects depending on the type of the variable | ||
can contain only values that are of the same type as the variable or a subtype of the variable's type | ||
can have an interface as its type which means that, with the variable, you can invoke any operation supported by the interface | ||
can refer to a particular object, several different objects during the execution of a program, or no object at all | ||
has 1 value at any one time which is the that it refers to | ||
has 1 name | ||
has scope which is the block in which it is declared | ||
has type | ||
has lifetime which is the time its block is being executed | ||
has purpose to refer to an object or a class or a primitive datum | ||
has scope | ||
has part value | ||
is declared by giving the data type followed by the name of the variable | ||
is destroyed in the block where it is declared | ||
may have access modifier | ||
refers to a class or an object or a primitive datum | ||
should have comment if it is non-obvious | ||
access unit | has access mode | |
syntactic unit | has syntax rule bold = mandatory |
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