A variable cannot be local and static at same time. Local variable means variable which is defined as part of code block or method and its scope is within that code block or method. This variable can’t be accessed outside its boundary.
Can a variable be instance variable and static at the same time?
Each object will have its own copy of instance variable whereas We can only have one copy of a static variable per class irrespective of how many objects we create. Changes made in an instance variable using one object will not be reflected in other objects as each object has its own copy of instance variable.
Can a static class variable and local variable have same name?
Answer: Yes — the scopes will not overlap so there will be two local variables, one per method, each with the same name.
Can static variables be local?
Therefore, all static variables need to be declared at class level and cannot be local variables. Unlike C/C++, static local variables are not allowed in Java. Static variables have to be declared at class level and cannot be declared at method level.
Can we make local variable as static in Java?
you cannot have a static local variable , but you can use instance variables or class variables. If you have your method as static which by default creates a copy of this method to all the objects and cant be broken down any further as local variables limit their access only to the method in which they reside.
Why would you use a static variable?
Static variables are used to keep track of information that relates logically to an entire class, as opposed to information that varies from instance to instance.
When Should a variable be static?
When you want to have a variable that always has the same value for every object of the class, forever and ever, make it static . If you have a method that does not use any instance variables or instance methods, you should probably make it static .
When a local variable has the same name as a field?
When a local variable has the same name as a field, the local variable’s name does this to the field’s name. Two or more methods in a class may have the same name, as long as this is different.
What happens when a global variable and a local variable share the same name?
Local variables can have the same name as global variables (those declared outside of any function). In that case, the global variable is inaccessible from within the function.
Can we use same variable name in two methods?
Do not use the same variable name in two scopes where one scope is contained in another. For example, No other variable should share the name of a global variable if the other variable is in a subscope of the global variable.
Is initialisation mandatory for local static variables?
Is initialisation mandatory for local static variables? Explanation: None.
Why static local variables are not allowed?
In Java, a static variable is a class variable (for whole class). So if we have static local variable (a variable with scope limited to function), it violates the purpose of static. Hence compiler does not allow static local variable.