// Zorah Fung, CSE 143
// Methods that use Value/Reference Semantics

import java.util.*;

public class ReferenceSemantics {
    public static void main(String[] args) {
        integer();
        integerObject();
        array();
        array2();
        list();
        point();
    }

    public static void integer() {
        System.out.println("integer");
        int number = 0;
        System.out.println("before: " + number);
        modifyInteger(number);
        System.out.println("after: " + number);
        System.out.println();
    }

    public static void modifyInteger(int n) {
        n = 42;
        System.out.println("in method: " + n);
    }

    public static void integerObject() {
        System.out.println("integer object");
        IntegerObject obj = new IntegerObject();
        System.out.println("before: " + obj.num);
        modifyIntegerObject(obj);
        System.out.println("after: " + obj.num);
        System.out.println();
    }

    public static void modifyIntegerObject(IntegerObject n) {
        n.num = 42;
        System.out.println("in method: " + n.num);
    }

    public static void array() {
        System.out.println("array");
        int[] array = new int[6];
        System.out.println("before: " + Arrays.toString(array) + " ref: " + array);
        modifyArray(array);
        System.out.println("after: " + Arrays.toString(array) + " ref: " + array);
        System.out.println();
    }

    public static void modifyArray(int[] a) {
        for (int i = 0; i < a.length; i++) {
            a[i] = (i + 1) * 11;
        }
        System.out.println("in method: " + Arrays.toString(a) + " ref: " + a);
    }

    public static void array2() {
        System.out.println("array2");
        int[] array = new int[6];
        System.out.println("before: " + Arrays.toString(array) + " ref: " + array);
        doNotModifyArray(array);
        System.out.println("after: " + Arrays.toString(array) + " ref: " + array);
        System.out.println();
    }

    public static void doNotModifyArray(int[] a) {
        a = new int[6];
        for (int i = 0; i < a.length; i++) {
            a[i] = (i + 1) * 11;
        }
        System.out.println("in method: " + Arrays.toString(a) + " ref: " + a);
    }

    public static void list() {
        System.out.println("list");
        ArrayList<Integer> list = new ArrayList<Integer>();
        System.out.println("before: " + list);
        modifyList(list);
        System.out.println("after: " + list);
        System.out.println();
    }

    public static void modifyList(ArrayList<Integer> list) {
        for (int i = 1; i <= 6; i++) {
            list.add(i * 11);
        }
        System.out.println("in method: " + list);
    }

    public static void point() {
        System.out.println("point");
        Point point = new Point();
        System.out.println("before: " + point);
        modifyPoint(point);
        System.out.println("after: " + point);
        System.out.println();
    }

    public static void modifyPoint(Point p) {
        p.x = 11;
        p.y = 22;
        System.out.println("in method: " + p);
    }
}