package day3;

import org.junit.Test;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

//呼叫執行時類的指定結構：屬性、方法、構造器
public class ReflectionDemo2 {
@Test
public void testField() throws Exception {
Class c1= Person.class;
Person p1=(Person)c1.newInstance();
//get，獲取執行時類及其父類的public的屬性
Field age = c1.getField("age");
age.set(p1,123);
System.out.println((int)age.get(p1));

    //getDeclared，獲取執行時類任意許可權的屬性
    Field name = c1.getDeclaredField("name");
    //把非public的屬性設定為可訪問
    name.setAccessible(true);
    name.set(p1,"Tom");
    System.out.println((String)name.get(p1));
}

@Test
public void testMethod() throws Exception {
    Class c1= Person.class;
    Person p1=(Person)c1.newInstance();
    //通過方法名和形參列表，獲取方法
    Method show = c1.getDeclaredMethod("showNation", String.class);
    show.setAccessible(true);
    System.out.println((String) show.invoke(p1,"China"));

    //呼叫靜態方法
    Method showDetail = c1.getDeclaredMethod("showDetail");
    showDetail.setAccessible(true);
    //呼叫者為執行時類
    showDetail.invoke(c1);
    showDetail.invoke(null);
}
 

}

class Person {
private String name;
public int age;

public Person(){
}
public Person(String name, int age) {
    this.name = name;
    this.age = age;
}
private Person(String name) {
    this.name = name;
}
public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}
@Override
public String toString() {
    return "姓名："+ name + "，年齡：" + age;
}
public String show(){
    return this.name+" , "+this.age;
}
private String showNation(String nation){
    return "我來自"+nation;
}
private static void showDetail(){
    System.out.println("誰是最可愛的人");
}
 

}