方法

package com.atguigu.java3;
import com.atguigu.java2.Person;
import org.junit.Test;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
/**
 * @author Dxkstart
 * @create 2021-06-07 18:46
 */
public class MethodTest {
    @Test
    public void test1(){
        Class<Person> clazz = Person.class;
        //getMethod():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 ms:declaredMethods){
            System.out.println(ms);
        }
    }
    /*
    @Xxxx
    权限修饰符   返回值类型   方法名(参数类型1   形参名，。。。) throws XxxxException{}
     */
    @Test
    public void test2(){
        Class<Person> 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++) {
                    System.out.print(parameterTypes[i].getName() + " args_" + i);
                }
            }
            System.out.print(")");
            //6.抛出的异常
            Class[] exceptionTypes = m.getExceptionTypes();
            if (exceptionTypes.length > 0){
                System.out.println("throws ");
                for(int i = 0;i < exceptionTypes.length;i++){
                    if(1 == exceptionTypes.length - 1) {
                        System.out.println(exceptionTypes[i].getName());
                        break;
                    }
                    System.out.println(exceptionTypes[i].getName() + ",");
                }
            }
            System.out.println();
        }
    }
}