package top.ltyzqhh.Reflection;
//什么叫反射
public class Test01 extends Object{
//通过反射获取类的class对象
public static void main(String[] args) throws ClassNotFoundException {
Class c1 = Class.forName("top.ltyzqhh.Reflection.User");
System.out.println(c1);
Class c2 = Class.forName("top.ltyzqhh.Reflection.User");
Class c3 = Class.forName("top.ltyzqhh.Reflection.User");
Class c4 = Class.forName("top.ltyzqhh.Reflection.User");
//一个类在内存中只有一个class对象
//一个类被加载后,类的整个结构都会被封装在class对象中
System.out.println(c2.hashCode());
System.out.println(c3.hashCode());
System.out.println(c4.hashCode());
}
}
//实体类 pojo, entity
class User{
private String name;
private int id;
private int age;
public User(){
}
public User(String name,int id,int age){
this.name=name;
this.id=id;
this.age=age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "User{" +
"name='" + name + '\\'' +
", id=" + id +
", age=" + age +
'}';
}
}
理解:获取对象的类,还能获取其类的一些具体信息