For a complete structural class by reflecting

For a complete structural class by reflecting

To get the properties of each section: Permissions modifier variable type variable names, etc.

Acquiring runtime class methods
annotation, permission modifier, return type, method name, parameter list, and abnormal

TestConstructor

package com.aff.reflection;
import org.junit.Test;
public class TestConstructor {
    @Test
    public void test1() throws Exception {
        Clazz class . = The Person class ;
         / * create objects corresponding runtime class using the newInstance (), is actually called empty argument runtime class constructor
          Want to be able to create success: ① required runtime class corresponding to free-argument constructor
                         ② permission constructor modifier permission to be enough
        */
        Object obj = clazz.newInstance();
        Person p = (Person) obj;
        System.out.println(p);//Person [name=null, age=0]
    }
}

 

TestField

package com.aff.reflection;

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

import org.junit.Test;

public class TestField {
    @Test
    public void test1() {
        Clazz class = the Person. Class ;
         // getFields (): Get the only run-time class and parent class declared as public attributes 
        Field, [] = fields1 clazz.getFields ();
        System.out.println(fields1);
        System.out.println();

        // 2.getDeclaredFields (): Get all the run attribute class declaration itself 
        Field, [] = fields2 clazz.getDeclaredFields ();
         for (Field, F: fields2) {
            System.out.println(fields2);
        }
    }

    // permission modifier variable type variable name
     // each section to get the properties 
    @Test
     public  void test2 () {
        Class clazz = Person.class;
        Field, [] fields2 = clazz.getDeclaredFields ();
         for (Field, F: fields2) {
             // 1. Each property rights acquired modifier 
            int I = f.getModifiers ();
            String str = Modifier.toString(i);
            System.out.println(str);

            // 2. Get property variable type 
            Class type = f.getType ();
            System.out.println(type.getName() + "");

            // 3. Get the property name 
            System.out.println (f.getName ());
            System.out.println();
        }
    }

    // Get Method runtime class
     // annotation, permission modifier, return type, method name, parameter list, abnormal 
    @Test
     public  void Test3 () {
        Clazz class . = The Person class ;
         // 1.getMethods (): Get all runtime class and its parent class declarations for methods public 
        Method, [] = M1 clazz.getMethods ();
         for (Method, m: M1) {
            System.out.println(m);
        }
        System.out.println("----------------------");

        // getDeclaredMethods (): Get the runtime class itself all methods declared 
        Method, [] M2 = clazz.getDeclaredMethods ();
         for (Method, m: M2) {
             // 1. Annotations 
            the Annotation [] = Ann m.getAnnotations () ;
             for (the Annotation A: Ann) {
                System.out.println(a + "--");
            }

            // 2. permission modifier 
            String str = Modifier.toString (m.getModifiers ());
            System.out.print(str + "--");

            // 3. Return Value Type 
            Class = the returnType m.getReturnType ();
            System.out.print(returnType.getName() + "--");

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

            // 5.形参列表
            // System.out.print("(");
            Class[] param = m.getParameterTypes();
            for (int i = 0; i < param.length; i++) {
                System.out.print("(" + param[i].getName() + " args-" + i + ")");
            }
            // 6. Exception Type 
            Class [] = EXPS m.getExceptionTypes ();
             IF (! Exps.length = 0 ) {
                System.out.println("throws");
            }
            for (int i = 0; i < exps.length; i++) {
                System.out.print(exps[i].getName() + "--");
            }
            System.out.println();
        }
    }
}