StaticMethodsExample.java

public class StaticMethodsExample {
    
    public static void main(String[] args) {
        // Access a static variable of Methods class.  Note that you don't have to
        // create an object instance of Methods class.
        System.out.println("Methods.a = " + Methods.a);
        
        // Invoke a static method of Methods class. Note that you don't have to
        // create an object instance of Methods class.
        Methods.staticMethod(5);
        
        // The static variable can be accessed from an object instance.
        Methods d = new Methods();
        System.out.println("d.a = " + d.a);
        
        // The static method can be invoked from an object instance.
        d.staticMethod(0);
        
        // The same static variable can be accessed from multiple instances.
        Methods e = new Methods();
        System.out.println("e.a = " + e.a);
        d.a += 3;
        System.out.println("Methods.a = " + Methods.a);
        System.out.println("d.a = " + d.a);
        System.out.println("e.a = " + e.a);
        
        // Compile error 
        // Methods.myNonStaticMethod(3);
    }
    
}