The public access level In Java:

If you precede an instance variable or a method of a public class with the keyword public, then any class can access that member using a reference and a dot notation (that is, using a qualified name). For example, consider the class: 

package AppletUser;
public class UserV2
{
// public instance variable
public int numOfAccesses;
// public setter method
public void setNumOfAccesses (int n)
{
numOfAccesses = n;

}

}

If class TestUserV2 creates an object of this class, it can also have statements that use quali?ed names to access the object's members: 

import AppletUser.*; 

public class TestUserV2
{
public static void main (String []args)
{
// this method has a UserV2 reference
UserV2 myUser;
// once initialized, the reference can be used
// to access members of a UserV2 object
myUser = new UserV2();
// qualified access to instance variable numOfAccesses
myUser.numOfAccesses = 1;
// qualified access to setNumOfAccesses method

myUser.setNumOfAccesses(1);

}

}

This is allowed because both of these members were declared to be public.

Inheritance of public members Any public members are inherited by all subclasses, so they can be accessed within those classes without a dot notation. For example, a class extending UserV2 could have statements using simple names: 

import AppletUser.*;

public class MyUser extends UserV2

{

public void doThings ()
{

// simple name access to numOfAccesses variable

numOfAccesses = 1;

// simple name access to setNumOfAccesses method

setNumOfAccesses(1); // same effect as line above

}

}

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