/**
This program demonstrates how to initialize different types of arrays
to zero in Java. It covers:
- Primitive numeric arrays
- Arrays of objects with a defined "zero state"
- Arrays of wrapper types
Java automatically initializes numeric primitives to zero, but we still
show explicit initialization patterns to make the logic clear and reusable.
*/
public class ArrayZeroInit {
// A simple class with a "zero state"
static class Point {
int x;
int y;
// Constructor for convenience
Point(int x, int y) {
this.x = x;
this.y = y;
}
}
// Initialize an int array to zero using a loop
static void initIntArray(int[] arr) {
for (int i = 0; i < arr.length; i++) {
arr[i] = 0; // explicit zero assignment
}
}
// Initialize an array of Points to a zero-state object
static void initPointArray(Point[] arr) {
for (int i = 0; i < arr.length; i++) {
arr[i] = new Point(0, 0); // zero-state object
}
}
// Initialize an array of Integer wrappers to zero
static void initIntegerArray(Integer[] arr) {
for (int i = 0; i < arr.length; i++) {
arr[i] = 0; // auto-boxed zero
}
}
// Print int array
static void printIntArray(int[] arr) {
for (int v : arr) {
System.out.print(v + " ");
}
System.out.println();
}
// Print Point array
static void printPointArray(Point[] arr) {
for (Point p : arr) {
System.out.print("(" + p.x + "," + p.y + ") ");
}
System.out.println();
}
// Print Integer array
static void printIntegerArray(Integer[] arr) {
for (Integer v : arr) {
System.out.print(v + " ");
}
System.out.println();
}
public static void main(String[] args) {
// Arrays of different types
int[] numeric = new int[5];
Point[] points = new Point[5];
Integer[] boxed = new Integer[5];
// Initialize all arrays to zero
initIntArray(numeric);
initPointArray(points);
initIntegerArray(boxed);
// Print results
printIntArray(numeric);
printPointArray(points);
printIntegerArray(boxed);
}
}
/*
run:
0 0 0 0 0
(0,0) (0,0) (0,0) (0,0) (0,0)
0 0 0 0 0
*/
