JAVA反射机制事例一

import java.lang.reflect.*;
public class ReflectTester {
public Object copy(Object object) throws Exception{
//获得对象的类型
Class classType=object.getClass();
System.out.println("Class:"+classType.getName());
//通过默认构造方法创建一个新的对象
Object objectCopy=classType.getConstructor(new Class[]{}).newInstance(new Object[]{});
//获得对象的所有属性
Field fields[]=classType.getDeclaredFields();
for(int i=0; i<fields.length;i++){
Field field=fields[i];
String fieldName=field.getName();
String firstLetter=fieldName.substring(0,1).toUpperCase();
//获得和属性对应的getXXX()方法的名字
String getMethodName="get"+firstLetter+fieldName.substring(1);
//获得和属性对应的setXXX()方法的名字
String setMethodName="set"+firstLetter+fieldName.substring(1);
//获得和属性对应的getXXX()方法
Method getMethod=classType.getMethod(getMethodName,new Class[]{});
//获得和属性对应的setXXX()方法
Method setMethod=classType.getMethod(setMethodName,new Class[]{field.getType()});
//调用原对象的getXXX()方法
Object value=getMethod.invoke(object,new Object[]{});
System.out.println(fieldName+":"+value);
//调用拷贝对象的setXXX()方法
setMethod.invoke(objectCopy,new Object[]{value});
}
return objectCopy;
}
public static void main(String[] args) throws Exception{
Customer customer=new Customer("Tom",21);
customer.setId(new Long(1));
Customer customerCopy=(Customer)new ReflectTester().copy(customer);
System.out.println("Copy information:"+customerCopy.getName()+" "+customerCopy.getAge());
}
}
class Customer{
private Long id;
private String name;
private int age;

public Customer(){}
public Customer(String name,int age){
this.name=name;
this.age=age;
}

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