package day07;public class P306 {public static void main(String[] args) {Product a = new Product(); Product a1 = new Product(); Product a2 = new Product(); Product a3 = new Product(); Product a4 = new Product(); System.out.println(a.serialNum);System.out.println(a1.serialNum);System.out.println(a2.serialNum);System.out.println(a3.serialNum);System.out.println(a4.serialNum);}}class Product {// 기본..

package day07;public class P302 {public static void main(String[] args) {BlockTest b = new BlockTest(); //각각 BlockTest에 대한 인스턴스를 생성함. BlockTest b2 = new BlockTest();BlockTest b3 = new BlockTest();BlockTest b4 = new BlockTest();}}class BlockTest {static {System.out.println(" static {} 초기화"); }{System.out.println(" {} 초기화"); // Default가 생략된 형태.}public BlockTest() {System.out.println("BlockTest() 생..