java反射语法

package com.jvm.seventh;import java.lang.reflect.Constructor;import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.lang.reflect.Modifier;public class TestReflect {public static void main(String[] args) throws Exception {//根据对象获取类名加包名Demo demo=new Demo();System.out.println(demo.getClass().getName());//获取class的三种途径Class clazz1=null;Class clazz2=null;Class clazz3=null;clazz1=demo.getClass();clazz2=Demo.class;clazz3=Class.forName("com.jvm.seventh.Demo");System.out.println(clazz1+","+clazz2+","+clazz3);//获取该类对象的接口System.out.println("----------implements interface----------------");Class[] inters=clazz1.getInterfaces();for(int i=0;i<inters.length;i++){System.out.println(inters[i].getName());}//获取该类的父类System.out.println("----------super class----------------");Class superClass=clazz1.getSuperclass();System.out.println(superClass.getName());//获取对象Demo d1=null;d1=(Demo)clazz1.newInstance();d1.setAge(10);d1.setName("d1--name");System.out.println(d1.toString());//获取构造器 构造对象 //构造器的数组的参数索引根据实际类中构造器的顺序来寻找的System.out.println("----------cosntructors ----------------");Constructor[] cons=clazz1.getConstructors();Demo d2=null;Demo d3=null;for(int i=0;i<cons.length;i++){System.out.println(cons[i]);}d2=(Demo)cons[0].newInstance("d3--name",100);d3=(Demo)cons[1].newInstance();System.out.println("d2:"+d2.toString());System.out.println("d3:"+d3.toString());//获取该类的属性//self-class fieldsSystem.out.println("----------declared fields----------------");Field[] fields=clazz1.getDeclaredFields();for(int i=0;i<fields.length;i++){int mod=fields[i].getModifiers();String priv=Modifier.toString(mod);Class type=fields[i].getType();System.out.println(priv+" "+type.getName()+" "+fields[i].getName());}//super filedsSystem.out.println("----------super fields----------------");Field[] superFields=clazz1.getFields();for(int i=0;i<superFields.length;i++){int mod=superFields[i].getModifiers();String priv=Modifier.toString(mod);Class type=fields[i].getType();System.out.println(priv+" "+type.getName()+" "+superFields[i].getName());}//操作属性System.out.println("----------oper name fields----------------");Field name=clazz1.getDeclaredField("name");name.setAccessible(true);name.set(demo, "asia");System.out.println(name.get(demo));//获取对象的方法System.out.println("----------invoke methods----------------");Method method=clazz1.getMethod("print",String.class);method.invoke(demo,"myArg");}}interface int1{public static final String int1="int1";}interface int2{public static final String int2="int2";}class Demo implements int1,int2{public Demo() {// TODO Auto-generated constructor stub}public Demo(String name,int age){this.name=name;this.age=age;}private String name;private int age;public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}@Overridepublic String toString() {// TODO Auto-generated method stubreturn "[name="+name+",age="+age+"]";}public void print(String arg){System.out.println("[arg="+arg+",name="+name+",age="+age+"]");}public void print(){System.out.println("[name="+name+",age="+age+"]");}}