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Judul : Does Coffee Give-Up The Ghost Past Times Value Or Give-Up The Ghost Past Times Reference - Interview Question
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Does Coffee Give-Up The Ghost Past Times Value Or Give-Up The Ghost Past Times Reference - Interview Question

Does Java is piece of occupation yesteryear past value or piece of occupation yesteryear past reference is i of the tricky Java question to a greater extent than frequently than non asked on fresher score interviews. Before debating whether Java is piece of occupation yesteryear past value or piece of occupation yesteryear past reference lets kickoff clear what is piece of occupation yesteryear past value together with what is piece of occupation yesteryear past reference. This enquiry has its rootage on C together with C++ where you lot tin piece of occupation yesteryear component parameter either value or retentiveness address, where value is stored (pointer). As per Java specification everything inwards Java is piece of occupation yesteryear past value whether its primitive value or objects together with it does construct feel because Java doesn't back upwards pointers or pointer arithmetic, Similarly multiple inheritance together with operator overloading is equally good non supported inwards Java. This enquiry becomes confusing when interviewer inquire nearly how object is passed inwards Java ? Answer to this enquiry is unproblematic whenever a method parameter facial expression object, reference of that object is passed. Many programmer confuses reference alongside pointers hither which is non correct, reference is a sort of own got which is used to locate object or alter object, but it doesn’t allows whatever pointer arithmetics i.e. you lot tin non growth or decrease retentiveness address together with locate a unlike object using reference inwards Java.

Pass yesteryear Value together with Pass yesteryear Reference Example inwards Java

Let’s come across 2 instance of calling method together with passing parameter this volition clear whatever uncertainty whether Java is piece of occupation yesteryear past value or piece of occupation yesteryear past reference. regard next example:

public class PassByValueExample {
 
    public static void main(String args[]) {
       int release = 3;
       printNext(number);
       System.out.println("number Inside main(): "+number);
    }
 
    public static void printNext(int number){
        number++;
        System.out.println("number Inside printNext(): "+number);
    }
 
}

Output:
release Inside printNext(): 4
release Inside main(): 3

Above instance clearly shows that primitives are passed equally piece of occupation yesteryear past value to method parameters, had Java piece of occupation yesteryear past reference both main method and printNext() would convey printed same value. Now facial expression at simply about other instance of passing object equally method parameter which volition confuse you lot that Java is piece of occupation yesteryear past reference, which Java is not.

public class PassByReferenceConfusion {
 
    public static void main(String args[]) {
       Car motorcar = new Car("BMW");
       System.out.println("Brand of Car Inside main() before: "+ car.brand);
       printBrand(car);
       System.out.println("Brand of Car Inside main()after: "+ car.brand);
    }
 
    public static void printBrand(Car car){
        car.brand = "Maruti";
        System.out.println("Brand of Car Inside printBrand(): "+car.brand);
    }
 
    private static class Car{
        private String brand;
     
        public Car(String brand){
            this.brand = brand;
        }

    }
}

Output:
Brand of Car Inside main() before: BMW
Brand of Car Inside printBrand(): Maruti
Brand of Car Inside main()after: Maruti

If you lot come across change made inwards method parameter is reflected globally i.e. construct of motorcar is changed inwards all places it way i object is used inwards both method. Well inwards reality if you lot piece of occupation yesteryear object equally method parameter inwards Java  it passes "value of reference" or inwards unproblematic term object reference or own got to Object inwards Java. Here reference term is exclusively unlike than reference term used inwards C together with C+ which conduct points to retentiveness address of variable together with discipline to pointer arithmetic. inwards Java object tin only survive accessed yesteryear its reference equally you lot tin non instruct retentiveness address where object is stored or to a greater extent than just at that topographic point is no method to instruct value of object yesteryear passing retentiveness address.

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