Scope of Java variables

1. Can be divided into member variables and Local Variables

the scope of the two is different : the scope of a local variable is limited to the method that defines it , method cannot be accessed outside the , The scope of a member variable can be accessed within the entire class if access permission is allowed , class can also be used outside the

different initial values : for member variables , If no initial value is given inside the class , Java will give it a default value , if the data type value is 0, the value of the reference type is NULL , but Java does not give local variable gives initial value , Therefore, the local variable must be defined to be assigned before it can be used Local variables can have the same name as member variables, and local variables have higher precedence when used

Scope of Java variables