Dart – Getters and Setters

Getters and Setters, also called accessors and mutators, allow the program to initialize and retrieve the values of class fields respectively. 

• Getters or accessors are defined using the get keyword.
• Setters or mutators are defined using the set keyword.

A default getter/setter is associated with every class. However, the default ones can be overridden by explicitly defining a setter/ getter. A getter has no parameters and returns a value, and the setter has one parameter and does not return a value.

Syntax: Defining a getter
 
Return type  get identifier  
{  
    // statements
}  

Syntax: Defining a setter  
 set identifier  
 {      
// statements 
}

The following example shows how you can use getters and setters in a Dart class:

// Dart Program to illustrate getters and setters
 
 class Student {
 String name="";
 int age=0;
 String get stud_name {
     return name;
 }
 void set stud_name(String name) {
     this.name = name;
 }
 void set stud_age(int age) {
     if(age<= 0) {
         print("Age should be greater than 5");
     } else {
         this.age = age;
     }
 }
 int get stud_age {
     return age; 
 }
 }
 void main() {
 Student s1 = new Student();
 s1.stud_name = 'Nitin';
 s1.stud_age = 0;
 print(s1.stud_name);
 print(s1.stud_age);
 }

Output:
Age should be greater than 5
Nitin
Null