What is the difference between local and global variables in Java?

What is the difference between local and global variables in Java?

In Java, local variables are declared within a method and can only be accessed within that method. Global variables, or instance variables, are declared in a class and can be accessed by all methods in that class.

Can you give me an example of each?

Sure! A local variable example would be a variable declared inside a method like this: void myMethod() { int localVar = 5; }. A global variable example would be: class MyClass { int globalVar; void myMethod() { globalVar = 10; } }.

Are there any advantages to using global variables?

Yes, global variables can be useful for sharing data across multiple methods in a class, but they can also lead to issues with data integrity if not managed properly.

What are the best practices for using local and global variables?

Best practices include minimizing the use of global variables to avoid side effects, using local variables for temporary data, and ensuring that global variables are well-documented and used consistently.