JAVA中创建对象的四种方式

JAVA中创建对象的四种方式

/**
 * 

 * Title: 创建对象的四种方式
 * 
 * 
 * 
 * @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);
    }
}