Accessing Class Fields from Static and Non-static Methods - Java Object Oriented Design

Java examples for Object Oriented Design:Static

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Description

Accessing Class Fields from Static and Non-static Methods

Demo Code

public class Main {
  public static void main(String[] args) {
    MyClass mt = new MyClass();
    System.out.println("Invoking instance method...");
    mt.printMN();//from  w  w w.  j  a v a  2 s  .  c  om
    System.out.println("Invoking class method on class name...");
    MyClass.printM();

    System.out.println("Invoking class method on an instance...");

    // Invoke the class method using the instance reference
    mt.printM();
  }
}

class MyClass {
  static int m = 100; // A static variable
  int n = 200; // An instance variable

  static void printM() {
    System.out.println("printM() - m = " + m);
  }

  void printMN() {
    /* We can refer to both static and instance variables m and n in this method */
    System.out.println("printMN() - m = " + m);
    System.out.println("printMN() - n = " + n);
  }
}

Result


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