Static and Non-Static Methods

Static and Non-Static Methods 

• Static keyword with method It describes that this method is static and If method do not have static keyword then that method is non static.
  

• Same rule is applied for variables too. Static means stable and non static means unstable in common words. There are several difference between static and not static methods in as described bellow.

Main Difference Between Static And Non Static Methods

• We can call static methods directly while we can not call non static methods directly. You need to create and instantiate an object of class for calling non static methods.
• Non static stuff (methods, variables) can not be accessible inside static methods Means we can access only static stuff inside static methods.
• Opposite to It, Non static method do not have any such restrictions. We can access static and non static both kind of stuffs inside non static methods
• Static method is associated with the class while non static method is associated with an object.

Created Two different class as bellow.

package Test_Package1;

public class static_nonstatic {

static int wheel = 2;

int price = 25000;

public static void main(String[] args) { //static method.

//Can access static methods directly Inside static method.

byke1();

//Can access static variables directly Inside static method.

System.out.println("Main static method : wheels = "+wheel);

//Can not access non static variables directly inside static method.

//System.out.println("Main static method : wheels = "+price);

//Can not access non static methods directly inside static method.

//byke2();

//Created object of class to access non static stuff Inside static method.

static_nonstatic sn = new static_nonstatic();

//Now We can access non static methods of class Inside static methods using object reference.

sn.byke2();

//Now We can access non static variables of class Inside static methods using object reference.

System.out.println("Main static method : price = "+sn.price);

}

public static void byke1(){ //static method.

//Can access static variables directly Inside static method.

System.out.println("byke1 static method : wheels = "+wheel);

//Can not access non static variables directly inside static method.

//System.out.println(price);

}

public void byke2(){ //non static method.

//Can access static variable directly inside non static method.

System.out.println("byke2 Non static method : wheels = "+wheel);

//Can access non static variable directly inside non static method.

System.out.println("byke2 Non static method : price = "+price);

//Can access static methods directly Inside non static method.

byke1();

}

}

package Test_Package1;

public class static_ousideclass {

public static void main(String[] args) { //static method.

//Can call static function from other class directly using class name.

static_nonstatic.byke1();

//Can call static variables from other class directly using class name.

System.out.println("Using static variable of other class"+static_nonstatic.wheel);

//Created object of class static_nonstatic to access non static stuff from that class.

static_nonstatic oc = new static_nonstatic();

//Now We can access non static variables of other class Inside static methods using object reference.

System.out.println("Accessing non static variable outside the class : "+oc.price);

//Now We can access non static methods of other class Inside static methods using object reference.

oc.byke2();

}

}

As you can see in above examples, we can access only static stuff Inside any static methods directly. If you wants to access static method or variable Inside different class then you can access It using simply class name as shown In above example. You must have to create object of class to access non static method or variable Inside static method (byke1) of same class or different class(main method of 2nd class).

On other side, we can access static and non static methods and variables directly inside non static method (byke2). There is not any such access restrictions.