关于java:java创建对象的五中方式

一：创立一个测试实体

public class Hello implements Cloneable, Serializable {    public Hello() {    }    public void hello() {        System.out.println("hello world"); }} 

二：创建对象

// 形式一：通过new创立Hello hello1 = new Hello();hello1.hello();//形式二：通过class类的newInstance 形式创立try {    Class<?> aClass = Class.forName("com.albb.test.entity.Hello"); Hello hello2 = (Hello) aClass.newInstance(); hello2.hello();} catch (Exception e) {    e.printStackTrace();}// 形式三：通过constructor newInstance形式创立try {    Class<?> aClass1 = Class.forName("com.albb.test.entity.Hello"); Constructor<?> constructor = aClass1.getConstructor(); Hello hello3 = (Hello) constructor.newInstance(); hello3.hello();} catch (Exception e) {    e.printStackTrace();}// 形式四：通过clone创立try {    Hello h1 = new Hello(); Hello h2 = (Hello)h1.clone(); h2.hello();} catch (Exception e) {    e.printStackTrace();}// 形式五： 通过序列化创立//把内存中对象的状态转换为字节码的模式//把字节码通过IO输入流，写到磁盘上//永恒保留下来，长久化//反序列化//将长久化的字节码内容，通过IO输出流读到内存中来//转化成一个Java对象Hello hello = new Hello();File file = new File("hello-serializable");try {    FileOutputStream fileOutputStream = new FileOutputStream(file); ObjectOutputStream objectOutputStream = new ObjectOutputStream(fileOutputStream); FileInputStream fileInputStream = new FileInputStream(file); ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream); objectOutputStream.writeObject(hello); Hello h = (Hello) objectInputStream.readObject(); h.hello();} catch (Exception e) {    e.printStackTrace();}