Parameters

[MIA6]

Describe the differences that can occur during parameter passing in Java when the parameters are variables that store primitives vs. non-primitives.

So the parameters that store primitives basically store numbers, Double, int, etc. They pass by values. Non-primitives include objects i think, does it also include String? Objects pass by values too, but objects always object reference, so I'm bit confused. So what's the difference if I say objects pass by values and objects pass by reference? Thanks.

[renamed]

In Java, if you change the value of a variable passed by argument inside a method , it will not change its value.

public class Numbers extends JFrame {
	
	public void a (int x){
		x = 3;
	}
	
	public void a(String x){
		x = "eu";
	}
	
	public static void main(String[] args) {
		int x = 0;
		String xx = "vc";
		System.out.println(x);
		System.out.println(xx);
		new Numbers().a(x);
		new Numbers().a(xx);
		System.out.println(x);
		System.out.println(xx);
	}
}

Below a list of primitive types in Java

• boolean
• char
• byte
• short
• int
• long
• float
• double

Any other value is considered non-primitive... including String.

[JosAH]

Java has only one parameter passing mechanism: pass by value; all objects in Java are manipulated through their references (or 'pointers' in C-lingo). Those pointers are also passed by value.

kind regards,

Jos