Class Code 1/31/18 - Value vs. Reference

RefVsVal.java

import java.util.ArrayList;

public class RefVsVal{

    public static void valueCopy(int i){
        i++;
    }

    public static void refCopy(ArrayList<Integer> aj){
        aj.add(20);
    }

    public static void main(String[] args){
        int j = 42;
        valueCopy(j);
        System.out.println(j);

        ArrayList<Integer> ai = new ArrayList<>();
        ai.add(19);
        refCopy(ai);
        System.out.println(ai);
    }
}

import java.util.ArrayList;

public class RefVsVal{

public static void valueCopy(int i){

i++;

}

public static void refCopy(ArrayList<Integer> aj){

aj.add(20);

}

public static void main(String[] args){

int j = 42;

valueCopy(j);

System.out.println(j);

ArrayList<Integer> ai = new ArrayList<>();

ai.add(19);

refCopy(ai);

System.out.println(ai);

}

Hi There!

Class Code 1/31/18 – Value vs. Reference

RefVsVal.java