java 创建对象的几种方式

1.用new语句创建对象

2.运用反射手段

3.调用对象的clone()方法

4.运用反序列化手段

 

代码

        //new
        Student student = new Student();
        student.setAge("12");
        student.setClassName("三年级一班");
        System.out.println(student);

        //反射-Contructor
        Constructor<Student> constructor = Student.class.getConstructor();
        Student student1  = constructor.newInstance();
        System.out.println(student1);

        //反射-newInstance
        Student student2  = Student.class.newInstance();
        System.out.println(student2);

        //clone
        Student student3 = student.clone();
        System.out.println(student3);

        //反序列化
        FileInputStream fileInputStream = new FileInputStream("E://tmp/employee.ser");
        ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream);
        Student student4 = (Student) objectInputStream.readObject();
        System.out.println(student4);