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Kotlin program | Example of Properties Getter and Setter Methods

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YasminRadwan26
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2022-07-14
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Properties Getter and Setter Methods

  • Variable having a class-level scope, declared inside the class body but outside the functions called property.
  • Property can be declared with var(mutable) and val (read-only). 
    var/val <propertyName>: <PropertyType> = <property_initializer>
[<getter>]
[<setter>]
  • property_initializer, getter, and Setter are optional.
  • Getter and Setter Auto-Generated into the code.
  • Getter is used to get the value of properties and setter is used to set value of properties.
  • val(read-only) type property does not allow setter.
  • If we don't want public access of setter than declare it private. 
    var name:String
private set
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YasminRadwan26
2022-07-14
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Program to demonstrate the example of Properties Getter and Setter Methods in Kotlin

package com.includehelp

// Declare class,
class America{
    // Declare property with initial value
    var city:String = "NewYork"
    // Auto Generated getter and setter
}

// Declare class,
class India{
    // Declare property with initial value
    var city:String = "Delhi"

    // define optional getter and setter
    get() = field // Getter
    set(value) {  // Setter
        field=value
    }
}

// Declare class, define optional getter and setter
class China{
    // Declare property with initial value
    var city:String = "Wuhan"

    // private setter, cant set value from outside the class
    private set

    // member function to set property
    fun setCity(city:String){
        this.city=city
    }

}

// declare class, with customized getter and setter
class Japan{
    // Declare property with initial value
    var city:String = "Tokyo"

    // Getter of property
    get() = field.toUpperCase()

    //setter of Property
    set(value) {
        field="Modern City $value"
    }
}

// Main function, entry Point of Program
fun main(){
    // create Instance
    val america=America()
    america.city="Alsakaaa" // access setter
    println("America : ${america.city}") // access getter

    // create Instance
    val india=India()
    india.city="Mumbai" // access setter
    println("India : ${india.city}") // access getter

    // create Instance
    val china=China()
    // Try to access private setter, leads to compile time error
    // china.city="Beijing"

    // Set City by calling member function
    china.setCity("Beijing")
    println("China : ${china.city}") // access getter

    // create Instance
    val japan=Japan()
    india.city="Quoto" // access setter
    println("Japan : ${india.city}") // access getter
}

Output:

America : Alsakaaa
India : Mumbai
China : Beijing
Japan : Quoto

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