java类反射获取类对象的三种方法

//获取class对象的三种方法
public class ReflectDemo1 {
    public static void main(String[] args) throws ClassNotFoundException {
        //1.通过class属性获取
        Class<Student> studentClass1 = Student.class;
        System.out.println(studentClass1);

        //2.通过对象的getClass方法获取
        Student student = new Student();
        Class<? extends Student> studentClass2 = student.getClass();
        //因为class对象为同一个所以可以通过==判断对象是否为同一个
        System.out.println(studentClass1 == studentClass2);

        //3.通过Class类的静态方法forName获取class对象
        Class<?> aClass = Class.forName("mystring.demo4.Student");
        System.out.println(aClass == studentClass1);
    }
}

Student类后续都要用到,反射的模板

package mystring.demo4;

public class Student {
    //成员变量：一个私有，一个默认，一个公共
    private String name;
    int age;
    public String address;

    //构造方法：一个私有，一个默认，两个公共
    public Student() {
    }

    private Student(String name) {
        this.name = name;
    }

    Student(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public Student(String name, int age, String address) {
        this.name = name;
        this.age = age;
        this.address = address;
    }

    //成员方法：一个私有，四个公共
    private void function() {
        System.out.println("function");
    }

    public void method1() {
        System.out.println("method");
    }

    public void method2(String s) {
        System.out.println("method:" + s);
    }

    public String method3(String s, int i) {
        return s + "," + i;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", address='" + address + '\'' +
                '}';
    }

    void say(){
        System.out.println("I love code");
    }
}