![Access Modifier (default)
D:/p1/Dog.java
package p1;
class Dog
{
void display()
{
System.out.println("Hello World!");
}
}
D:/DogNew.java
import p1.*;
class DogNew
{
public static void main(String args[])
{
Dog d=new Dog();
d.display();
}
}
Compile time error
Because only access within
same package](https://image.slidesharecdn.com/javamodifiers-191130070026/85/Java-modifiers-4-320.jpg)
![Access Modifier (public)
D:/p1/Dog.java
package p1;
public class Dog
{
public void display()
{
System.out.println("Hello World!");
}
}
D:/DogNew.java
import p1.*;
class DogNew
{
public static void main(String args[])
{
Dog d=new Dog();
d.display();
}
}
Hello World](https://image.slidesharecdn.com/javamodifiers-191130070026/85/Java-modifiers-6-320.jpg)
![Access Modifier (private)
D:/Dog.java
class A
{
private void display()
{
System.out.println("Hello World!");
}
}
class B
{
public static void main(String args[])
{
A a=new A();
a.display();
}
}
error: display() has private access in A obj.display();](https://image.slidesharecdn.com/javamodifiers-191130070026/85/Java-modifiers-8-320.jpg)
![Access Modifier (protected)
D:/p1/Dog.java
package p1;
public class A
{
protected void display()
{
System.out.println("Hello World!");
}
}
D:/DogNew.java
import p1.*;
class B extends A
{
public static void main(String args[])
{
A d=new A();
d.display();
}
}
Hello World](https://image.slidesharecdn.com/javamodifiers-191130070026/85/Java-modifiers-10-320.jpg)
Java modifiers
- 2. Modifiers Types • It is a keywords. • It is used to set access levels for classes, variables, methods and constructors. • 4 types of access modifier: 1. Default 2. Public 3. Private 4. protected
- 3. Access Modifier (default) • No need keyword. • Visible to the package, the default. No modifiers are needed. • The data members, class or methods which are not declared using any access modifiers. • It accessible only within the same package.
- 4. Access Modifier (default) D:/p1/Dog.java package p1; class Dog { void display() { System.out.println("Hello World!"); } } D:/DogNew.java import p1.*; class DogNew { public static void main(String args[]) { Dog d=new Dog(); d.display(); } } Compile time error Because only access within same package
- 5. Access Modifier (public) • Keyword: public • Accessible from everywhere in the program. • There is no restrictions on the scope of a public data members. • Class, method, or data members which are declared as public.
- 6. Access Modifier (public) D:/p1/Dog.java package p1; public class Dog { public void display() { System.out.println("Hello World!"); } } D:/DogNew.java import p1.*; class DogNew { public static void main(String args[]) { Dog d=new Dog(); d.display(); } } Hello World
- 7. Access Modifier (private) • Keyword: private • Accessible only within the class. • Any other class of same package will not be able to access. • Only visible within the enclosing class.
- 8. Access Modifier (private) D:/Dog.java class A { private void display() { System.out.println("Hello World!"); } } class B { public static void main(String args[]) { A a=new A(); a.display(); } } error: display() has private access in A obj.display();
- 9. Access Modifier (protected) • Keyword: protected • Accessible within same package or sub classes in different package. • only visible within the enclosing class and any subclasses
- 10. Access Modifier (protected) D:/p1/Dog.java package p1; public class A { protected void display() { System.out.println("Hello World!"); } } D:/DogNew.java import p1.*; class B extends A { public static void main(String args[]) { A d=new A(); d.display(); } } Hello World