In this tutorial, we will discuss about the protected keyword in java programming language
protected is a keyword in java programming language and an access modifier. This keyword can be used to define a method or a variable of a class.
When a variable or a method is declared as protected, it can be accessed from
Note – When a variable is marked as public, it can be used and accessed from enclosing class and outside classes
Syntax
Syntax of the protected keyword in Java variable
<access modifier> <Variable_type> <variable_name>;
Example
protected String stu_name; // this is a protected variable. It can be invoked from other classes in the same package as its enclosing class.
Note – when a method is marked as protected, it can be executed from another class in the same package as in enclosing class
Protected variable in same package
package sch;
public class school{
protected int marks;
} The following class in the same package named as package sch;
package sch;
public class student{
void getMarks(){
school sc=new school();
sc.marks=56; //access protected variable in same package
}
}
The following class in the different package. but it inherits (extends) studentclass properties. Hence it can access the variable age directly.
package sch1;
import sch.school
public class student extends school{
void getmarks(){
school sc=new school();
sc.marks=56; //you can access the protected variable in the
//different package of only from inherited class
}
} Different package and no inheritance
following class is in different package you cannot access the variable marks directly
package sch1;
import sch.school
public class student_Two{
void getMarks(){
school sc=new school();
sc.marks=56; //you cannot access the protected variable in the
//different package of only from inherited class
}
} Syntax
Syntax of the protected key word in Java methods
<access modifier> <Variable_type> <method_name>();
Example
protected void run() {
}// this is a protected method. It can be invoked from the same package enclosing classes.
There are other Java language keywords that are similar to this keyword
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