Method Variable in java

[Nidhi Jain]

Hi,

I have two doubt.

one if have one method and inside that mathod i have one variable can we use method variable without intialize it?

and second can method use class variable without intialize it value?

wat happen in both cases?


Thanks

[Jesper de Jong]

You cannot use variables that have not been initialized. If you try, the compiler will give you an error message.

However, class member variables are initialized implicitly if you don't initialize them yourself, whereas local variables (variables inside methods) are not - they must be initialized explicitly. For example:

public class Example {
    private String name;   // Is implicitly initialized to null
    private int age;       // Is implicitly initialized to 0
 
    public static void main(String[] args) {
        Example e = new Example();
        System.out.println("Name: " + e.name);   // prints: Name: null
        System.out.println("Age: " + e.age);     // prints: Age: 0
    }
}

[fred rosenberger]

the best way to learn this stuff is to try it out!!! write small, simple programs that do almost nothing (a "Hello, world!!" program would work for many cases), and see what happens!!! it's fast, easy, and you will learn it faster and remember it better if you do.