java之反射字段，反射方法
反射字段：
package heng.java.reflect.field;import java.lang.reflect.Field;public class ReflectFieldDemo {public static void main(String[] args) {/* * 获取类中的成员。反射字段。 */try {getFieldDemo();} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}public static void getFieldDemo() throws ClassNotFoundException, Exception, Exception{String className = "heng.java.reflect.constructor.Person";Class clazz = Class.forName(className);////Field field = clazz.getField("age");//该方法只获取公有的。Field field = clazz.getDeclaredField("age");//要对非静态的字段操作必须有对象Object obj = clazz.newInstance();//使用父类的方法将访问权限检查能力取消。field.setAccessible(true);//暴力访问。field.set(obj, 40);System.out.println(field.get(obj));}}
反射方法：
package heng.java.reflect.method;import java.lang.reflect.Method;public class ReflectMethodDemo {public static void main(String[] args) {try {getMethodDemo();getMethodDemo2();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}//反射方法，静态，无参数的show方法。private static void getMethodDemo2() throws Exception {String className = "heng.java.reflect.constructor.Person";Class clazz = Class.forName(className);Method method = clazz.getMethod("staticShow", null);method.invoke(null, null);}//反射方法，非静态，无参数的show方法。public static void getMethodDemo() throws Exception {String className = "heng.java.reflect.constructor.Person";Class clazz = Class.forName(className);Method method = clazz.getMethod("show", null);Object obj = clazz.newInstance();method.invoke(obj, null);}//反射方法，非静态，无参数的show方法。public static void getMethodDemo3() throws Exception{String className = "heng.java.reflect.constructor.Person";Class clazz = Class.forName(className);Method method = clazz.getMethod("paramShow", String.class,int.class);Object obj = clazz.newInstance();method.invoke(obj, "wangwu",22);}}
Person类：
package heng.java.reflect.constructor;public class Person {private String name;private int age;public Person(String name, int age) {super();this.name = name;this.age = age;}public Person() {super();System.out.println("Person run");}public void show(){System.out.println("person show run");}public static void staticShow(){System.out.println("person static show run");}public void paramShow(String name, int age){System.out.println("show:"+name+"-----"+age);}}