Static & Instance Variable in Java

Published: 25 May 2022
on channel: JavaTwist

Static variable and Instance variable in Java:
A static variable is shared by all instances of the class, while an instance variable is unique to each instance of the class

A static variable is created only once when the classloader loads the class.

Syntax: static int x;

An instance variable is a property of an instance.

An instance variable is created everytime an instance is created.

Syntax: int x;

Example Code:

package p1;
class A{

int x=200; //instance variable

static int y=300;//static variable

}

public class B {

public static void main(String[] args) {
A a = new A();
A a1= new A();

System.out.println("The instance variable of object a is: " + a.x);//200
System.out.println("The instance variable of object a1 is: " +a1.x);//200

a1.x=500;
System.out.println("The changed value of instance variable of object a1 is: "+a1.x);//500

System.out.println("The static variable value of object a is: " + a.y);//300
System.out.println(" The static variable of object a1 is: " + a1.y);//300

a1.y=600;

System.out.println("Static variable values of object a and a1 is : "+ a1.y +" "+ a.y);//600 600

}
}
Static variable and Instance variable in Java:

A static variable is shared by all instances of the class, while an instance variable is unique to each instance of the class

A static variable is created only once when the classloader loads the class.

Syntax: static int x;

An instance variable is a property of an instance.

An instance variable is created everytime an instance is created.

Syntax: int x;

Example Code:
package p1;

class A{

int x=200; //instance variable

static int y=300;//static variable

}

public class B {

public static void main(String[] args) {
A a = new A();
A a1= new A();

System.out.println("The instance variable of object a is: " + a.x);//200
System.out.println("The instance variable of object a1 is: " +a1.x);//200

a1.x=500;
System.out.println("The changed value of instance variable of object a1 is: "+a1.x);//500

System.out.println("The static variable value of object a is: " + a.y);//300
System.out.println(" The static variable of object a1 is: " + a1.y);//300

a1.y=600;

System.out.println("Static varible values of object a and a1 is "+ a1.y +" "+ a.y);//600 600

}
}

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