Can you please help me with below code. The error is: "Cannot use This in a static context"
public class Sample2 {
/**
* @param args
*/
public static void main(String[] args)
{
Sample2 sam=new Sample2();
//Below code works fine
System.out.println(sam);
//Below code is displaying error
System.out.println(this);
}
}
In java you can not use this in static methods (static context). Static methods do not point to any instance of the enclosing class. Show activity on this post. If we try to access this from a static context , compiler has no way to guess which instance, you are referring too.
But static contexts(methods and blocks) doesn't have any instance they belong to the class. In a simple sense, to use “this” the method should be invoked by an object, which is not always necessary with static methods. Therefore, you cannot use this keyword from a static method.
No, we can't use “this” keyword inside a static method. “this” refers to current instance of the class. But if we define a method as static , class instance will not have access to it, only CLR executes that block of code. Hence we can't use “this” keyword inside static method.
For the same reasons, a non-static method cannot be referenced from a static context, either, as the compiler cannot tell which particular object the non-static member belongs to.
See, "this" keyword refers to current object due to which method is under exceution. As, you cannot call static method using instance of class. That is why, "this" can't be used in the above example in a static method as it is trying to print current instance wich is not at all created. So, I think thats why there is an compile time error that you are getting.
They keyword this
refers to the instance of the class. In a static context, you have no instance, therefore you can't refer it.
For more information, refer to this answer: What is the meaning of "this" in Java?
In java you can not use this in static methods (static context).
Static
methods do not point to any instance of the enclosing class.
A static method cannot refer to “this” or “super” keywords in anyway
Refer official docs on this keyword
If we try to access this from a static context , compiler has no way to guess which instance, you are referring too. main is a static method here.
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