Java - Calling Non Static Members Directly From Constructor Without Using the Object Name

// Java program Illustrating Calling Static Data Members
// Without the Instance or object of that class

// Main class
public class GFG {

    // Static variable
    static int a = 5;

    // Method 1
    // Static method
    static void f()
    {
        // Print statement whenever static method is called
        System.out.println("I am static method");
    }

    // Method 2
    // Main driver method
    public static void main(String[] args)
    {
        // Calling static data members without the
        // instance or object of that class.
        System.out.println(GFG.a);

        // Calling method 1
        GFG.f();
    }
}

// Java Program Illustrating Calling Non-static Data Members

// Main class
public class GFG {

    // Non-static variable
    int a = 5;

    // Method 1
    // Non-static method
    void f()
    {

        // Print statement whenever non static method is
        // called
        System.out.println("I am Non-static method");
    }

    // Method 2
    // Main driver method
    public static void main(String[] args)
    {
        // Creating object of class inside main()
        GFG obj = new GFG();

        System.out.println(obj.a);
        // Calling non static data members
        obj.f();
    }
}

// Java program Illustrating Calling Non-static Method
// Without using Object Name

// Main class
class GFG {

    // Calling non-static method
    // through constructor
    GFG()
    {
        int a = 5;
        System.out.println(a);
        display();
    }

    // Method 1
    // Non static method
    void display()
    {

        // Print statement whenever non-static method is
        // called
        System.out.println(
            "Non static method is called using constructor.");
    }

    // Method 2
    // Main driver method
    public static void main(String[] a) { new GFG(); }
}