Java反射示例代码

package reflect;

import java.lang.reflect.*;

public class myTest {

public static void main(String[] args) throws Exception {

//通过类名获得class
Class<?> c = null;
c = Class.forName("reflect.Person");

//创建实例
Person p = null;
p = (Person)c.newInstance();
p.say("-------------");

//通过方法名、参数类型调用方法
Method method=c.getMethod("say", String.class);
method.invoke(c.newInstance(), "1234567890");

//设置属性值
Field field = c.getField("name");
Person p1 = (Person)c.newInstance();
System.out.println("变更前" + field.get(p1));
field.set(p1, "Tom222");
System.out.println("变更后" + field.get(p1));

//调用get、set方法
String paramName = "name";
String firstLetter = paramName.substring(0, 1).toUpperCase();
Method m = c.getMethod("get" + firstLetter + paramName.substring(1));
Person p2 = (Person)c.newInstance();
System.out.println(m.invoke(p2));
m = c.getMethod("set" + firstLetter + paramName.substring(1), String.class);
m.invoke(p2, "TomTom");
System.out.println(p2.getName());
}
}

class Person{

public String name = "Tom";

public Person(){

}

public Person(String name){
this.name = name;
}

public String getName() {
return name;
}

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

public void say(String a){
System.out.println(name + " say " + a);
}

}