JAVA反射学习（1）

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package com.langsin.reflection;import java.lang.reflect.Method;public class DumpMethods {public static  void main(String[] args)throws Exception {//加载并初始化命令行参数指定的类Class<?> classType = Class.forName(args[0]);//得到当前类声明的所有方法，包括privateMethod[] methods = classType.getDeclaredMethods();//下面这个方法是得到当前类及其实现接口和超类的所有public方法//Method[] methods = classType.getMethods();for(int i=0;i<methods.length;i++){System.out.println(methods[i].toString());}}}

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package com.langsin.reflection;import java.lang.reflect.Field;import java.lang.reflect.Method;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当前类的一个实例        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.getId() + " " + 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;    }    public Long getId()    {        return id;    }    public void setId(Long id)    {        this.id = id;    }    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;    }}

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