Contents
Entrance Modifiers in java
There are two types of modifiers in java: entrance modifiers and non-entrance modifiers.
The entrance modifiers in java specifies entranceibility (scope) of a data member, way(method) ,
createror class.
There are 4 types of java entrance modifiers:
1. private
2. default
3. protected
4. public
1) private entrance modifier
The private entrance modifier is provided only enclosed by class.
Simple example of private entrance modifier
In this example, we have produced two classes A and Simple. A class insure private data
member and private way(method) . We are entranceing these private members from outside
the class, so there is compile time error.
class A{
private int data=40;
private void msg(){System.out.println(“Hello progemarcoding.com”);} }
public class Simple{
public static void main(String args[]){
A obj=new A();
System.out.println(obj.data);//Compile Time Error
obj.msg();//Compile Time Error
} }
2) default entrance modifier
If you don’t use any modifier, it is treated as default by default. The default modifier
isprovided only enclosed by package.
Example of default entrance modifier
In this example, we have produced two packages pack and mypack. We are entranceing the A
class from outside its package, since A class is not public, so it cannot be satisfied from outside
the package.
//save by A.java
package pack;
class A{
void msg(){System.out.println(“Hello progemar”);}
}
//save by B.java
package mypack;
import pack.*;
class B{
public static void main(String args[]){
A obj = new A();//Compile Time Error
obj.msg();//Compile Time Error } }
In the above example, the scope of class A and its way(method) msg() is default so it cannot
besatisfied from outside the package.
3) protected entrance modifier
The protected entrance modifier is provided enclosed by package and outside the package but
throughinheritance only.
The protected entrance modifier can be useable on the data member, way(method) and creater. It
can’tbe useable on the class.
Example of protected entrance modifier
In this example, we have produced the two packages pack and mypack. The A class of pack
package is public, so can be satisfied from outside the package. But msg way(method) of this
packageis said as protected, so it can be satisfied from outside the class only through inheritance.
//save by A.java
package pack;
public class A{
protected void msg(){System.out.println(“Hello progemar”);} }
//save by B.java
package mypack;
import pack.*;
class B expand A{
public static void main(String args[]){
B obj = new B();
obj.msg();
} }
Output:Hello
4) public entrance modifier
The public entrance modifier is provided everywhere. It has the widest scope among all other
modifiers.
Example of public entrance modifier
//save by A.java
package pack;
public class A{
public void msg(){System.out.println(“Hello prohemar”);} }
//save by B.java
package mypack;
import pack.*;
class B{
public static void main(String args[]){
A obj = new A();
obj.msg();
} }
Output:Hello progemar