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static instance variables  RSS feed

 
Ranch Hand
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can we declare instance variables as static?
please elaborate on this.
 
Ranch Hand
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It is allowed to declare variables in the class as static.

But its wrong to call them "instance variables". They are "class variables".
They are shared by all instances (or objects) of the class.

Hope this clarifies.
 
Shiva Shankar
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See the commented line below.
what is the scope of ref in the following program?
In which scenario we will use those declarations?


class MyClass {
static MyClass ref;//is this valid?
String[] arguments;
public static void main(String args[])
{
ref= new MyClass();
ref.func(args);
}
public void func (String[] args)
{
ref.arguments=args;
for(int i=0;i<arguments.length;i++)
{
System.out.println(arguments[i]);
}
}
}
}
 
Gaurav Bhatia
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Code is valid.
Scenario like this can be used while implementing Singleton design pattern.
 
It is sorta covered in the JavaRanch Style Guide.
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