JAVA反射简单实例

package reflect;

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

public class Entity extends EntityFather {

    private String name;     private String age;     private String sex;

    public String getName() {         return name;     }

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

    public String getAge() {         return age;     }

    public void setAge(String age) {         this.age = age;     }

    public String getSex() {         return sex;     }

    public void setSex(String sex) {         this.sex = sex;     }

    public static void save_Entity(Object obj) {

        try { //            Class c1 = obj.getClass();//设置新值 //            Field field = c1.getDeclaredField("name"); //            field.set(obj, "new Young");             // Class1 cl1 = new Class1();             // Class cl2 = Class1.class;             // Class1 cl3 =cl1.getClass();             // Class cl4=Class.forName(package.class);             String attr;             String val;             int modifer;             String modiferName;

            Class c = obj.getClass();             Field[] fs = c.getDeclaredFields();             for (Field f : fs) {                 modifer = f.getModifiers();                 modiferName = Modifier.toString(modifer);                 attr = f.getName();       //属性名 顺序按照POJO类中的private属性顺序                 val = (String) f.get(obj);//属性值                 System.out.println("Modifier:" + modiferName + "\tAttr:" + attr + "\tVal:" + val);             }         } catch (Exception ex) {             System.out.println(ex.getMessage());         }     }

    public static String getStr(String str) {         System.out.println("调用返回值：" + str);         return str;     }     /////////////////

    public static void main(String[] args) {         Entity entity = new Entity();         entity.setName("Young");         entity.setSex("男");         entity.setAge("25");

        //new Entity().save_Entity(entity);         Method[] ms = Entity.class.getDeclaredMethods();         String methodName;         int modifier;         String modifierName;

        for (Method m : ms) {             methodName = m.getName();             System.out.println(methodName);             try {                 if (methodName.startsWith("save")) {                     m = Entity.class.getDeclaredMethod(methodName, new Class[]{Object.class});//声明方法参数类型                     m.invoke(entity, entity);

                    modifier = m.getModifiers();                     modifierName = Modifier.toString(modifier);                     System.out.println("Method Modifier:" + modifierName);    //方法访问类型                     System.out.println("Method return type:" + m.getReturnType().getName());//方法返回值类型                     System.out.print("Params:");                     for (Class cls : m.getParameterTypes()) {      //方法属性值类型                         System.out.print(cls.getName() + ",");                     }                     System.out.println("");                 } else { //                    m = Entity.class.getMethod("getStr", String.class); //                    String s=(String)m.invoke(entity, "Invoke Msg"); //