JAVA中创建对象的四种方式

/** * <p> * Title: 创建对象的四种方式 * </p> *  *  * @author lwx * @version 1.0 * @create 2013 1 17 14:03:35 */public class CreateObj implements Cloneable,Serializable{    private static String filename = CreateObj.class.getResource("").getPath()            + "/obj.txt";    static File file = new File(filename);    static {        if (!file.exists())            try {                file.createNewFile();            } catch (IOException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }    }    public static void main(String[] args) throws Exception {        // 1.第一种常用方式        CreateObj s1 = new CreateObj();        System.out.println(s1);        // 2.第二种方式 静态方式 java.lang.InstantiationException        CreateObj s2 = (CreateObj) Class.forName(                "com.newland.commons.collectionutil.CreateObj").newInstance();        System.out.println(s2);        //第三种方式 用对象流来实现 前提是对象必须实现 Serializable        ObjectOutputStream objectOutputStream = new ObjectOutputStream(                new FileOutputStream(filename));        objectOutputStream.writeObject(s2);        ObjectInput input=new ObjectInputStream(new FileInputStream(filename));        CreateObj s3 = (CreateObj) input.readObject();        System.out.println(s3);        //第四种 clone 必须 实现Cloneable接口 否则抛出CloneNotSupportedException        CreateObj obj=new CreateObj();        CreateObj s4= (CreateObj) obj.clone();        System.out.println(s4);    }}