package top.qaqaq.java.P651;

import org.junit.jupiter.api.Test;
import top.qaqaq.java.P649.Person;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

/**
 * 获取运行时类的方法结构
 *
 * @author RichieZhang
 * @create 2022-11-01 下午 8:31
 */
public class MethodTest {

    @Test
    public void test1() {

        Class clazz = Person.class;

        //getMethods(): 获取当前运行时类及其所有父类中声明为public权限的方法
        Method[] methods = clazz.getMethods();
        for (Method m : methods) {
            System.out.println(m);
        }

        System.out.println();

        //getDeclaredMethods(): 获取当前运行时类中声明的所有方法。（不包含父类中声明的方法）
        Method[] declaredMethods = clazz.getDeclaredMethods();
        for (Method m : declaredMethods) {
            System.out.println(m);
        }
    }

    /*
    @Xxxx
    权限修饰符 返回值类型 方法名(参数类型1 形参名1,...) throws XxxException{}
     */
    @Test
    public void test2() {

        Class clazz = Person.class;
        Method[] declaredMethods = clazz.getDeclaredMethods();
        for (Method m : declaredMethods) {
            //1. 获取方法声明的注解
            Annotation[] annos = m.getAnnotations();
            for (Annotation a : annos) {
                System.out.println(a);
            }

            //2. 权限修饰符
            System.out.print(Modifier.toString(m.getModifiers()) + "\t");

            //3. 返回值类型
            System.out.print(m.getReturnType().getName() + "\t");

            //4. 方法名
            System.out.print(m.getName());
            System.out.print("(");

            //5. 形参列表
            Class[] parameterTypes = m.getParameterTypes();
            if (!(parameterTypes == null && parameterTypes.length == 0)) {
                for (int i = 0; i < parameterTypes.length; i++) {

                    if (i == parameterTypes.length - 1) {
                        System.out.print(parameterTypes[i].getName() + "args_" + i);
                        break;
                    }

                    System.out.print(parameterTypes[i].getName() + "args_" + i + ",");
                }
            }
            System.out.print(")");

            //6. 抛出的异常
            Class[] exceptionTypes = m.getExceptionTypes();
//            if (!(exceptionTypes == null || exceptionTypes.length == 0)){
//                System.out.print("throws ");
//                for (int i = 0; i < exceptionTypes.length; i++){
//
//                    if (i == exceptionTypes.length - 1){
//                        System.out.print(exceptionTypes[i].getName());
//                        break;
//                    }
//
//                    System.out.print(exceptionTypes[i].getName() + ",");
//                }
//            }
            if (exceptionTypes.length > 0){
                System.out.print("throws ");
                for (int i = 0; i < exceptionTypes.length; i++) {

                    if (i == exceptionTypes.length - 1) {
                        System.out.print(exceptionTypes[i].getName());
                        break;
                    }

                    System.out.print(exceptionTypes[i].getName() + ",");
                }
            }

            System.out.println();

        }
    }
}