Access Modifiers in Java

Access Modifiers  in Java. In this Article i will explain what is Access Modifiers by stepping through the sample program below

In the sample program below, first  I will create a main class named “car ” .Then i will create a class call “accessModifier” to access  the class ” car “.

Class Car

1. First i declare no modifier variable ” engineVolume , carSpeed”
2. Then I declare a private Variable ” privateCar”
3. Then I declare a private Variable ” publicCar”
4. Lastly i declare  a protected  Variable “protectedCar”
5. I create an Empty Constructor
6. Create a setter and getter to read and write the “privateCar” Variable.
7. Create an increaseSpeed function
8. Create a decreaseSpeed function,

package Automation;

public class car {
	
	// Car Engine Volume
	
	// No Modifier - accessible in the same package

	int engineVolume;
	
	int carSpeed;
	// private - accessible in this class only
	private int privateCar =20;

	
    //public - can be Access in any where Java, any Packages

	public int publicCar=15;
	
	//protected-Can only be access same package and in sub classes
		protected int protectedCar =40;

	
	// create Object Constructor ,this(0) means no parameter needed
	
	public car(){
		
		
	}
	
	// Getter - To access the privateCar value
	// Setter - To overwrite the Private Car Value.
	
	public void setPrivateCar(int Pspeed) {
		this.privateCar = Pspeed;
	}
	public int getPrivateCar() {
	        return privateCar;
	    }



	// Create increase Speed Function
	
	
	public void increaseSpeed (){
		
		carSpeed++;
		System.out.println("Increasing the Car Speed");


		}
   public void decreaseSpeed (){
		
		carSpeed--;
		System.out.println("Decreasing the Car Speed");


		}

   
 

}

accessModifier

1. I create a new car object called “secondCar”
2. Access the ” No Modifier ” Variable “carSpeed”
3. Access the privateCar variable through “secondCar.getPrivateCar()”
4. Write a new Value into privateCar variable using ” secondCar.setPrivateCar(1000);”
5. Access the publicCar and the protectedCar Variable.

package Automation;

public class accessModifier {

	public static void main(String[] args) {
		car secondCar = new car();
		
		secondCar.increaseSpeed();
		// No Modifier
		secondCar.carSpeed = 10;
		System.out.println(secondCar.carSpeed);
		
		// Access the Private Modifier
		System.out.println(secondCar.getPrivateCar());
		
		//Overwrite the variable inside the Private Modifier
		secondCar.setPrivateCar(1000);
		//After Overwrite the variable inside the Private Modifier , Access the Varible again
		System.out.println(secondCar.getPrivateCar());
		// Print Out Public Car
		System.out.println(secondCar.publicCar);
		
		// Print out Protected Car
		System.out.println(secondCar.protectedCar);
	
		secondCar.decreaseSpeed();


	}

}

Check Out Inheritance in Java Here