Example: Array variables contain references to arrays.

ArraysByRefDemo.java

/**
 * Example: Array variables contain references to arrays. When you make an assignment to an array variable, it simply copies the reference. But it doesn’t copy the array itself.
 * To create a new copy of array java.util.Arrays provides a method named copyOf.
 * Reference:
 * https://books.trinket.io/thinkjava2/chapter7.html
 *
 * */
import java.util.Arrays;

public class ArraysByRefDemo {
    public static void main(String[] args) {
        int[] a = {10,20,30};
        int [] b = a;
        int[] c;
        a[0]=501;
        //print all the elements of A
        System.out.println(Arrays.toString(a));
        //print all the elements of B
        System.out.println(Arrays.toString(b));

        c = Arrays.copyOf(a,a.length);
        a[0]=101;
        System.out.println(Arrays.toString(a));
        System.out.println(Arrays.toString(c));


    }
}