Java Reflection (JAVA·´Éä)
Reflection ÊÇ Java ³ÌÐò¿ª·¢ÓïÑÔµÄÌØÕ÷Ö®Ò»£¬ËüÔÊÐíÔËÐÐÖÐµÄ Java ³ÌÐò¶Ô×ÔÉí½øÐмì²é£¬»òÕß˵“×ÔÉ󔣬²¢ÄÜÖ±½Ó²Ù×÷³ÌÐòµÄÄÚ²¿ÊôÐÔ¡£ÀýÈ磬ʹÓÃËüÄÜ»ñµÃ Java ÀàÖи÷³ÉÔ±µÄÃû³Æ²¢ÏÔʾ³öÀ´¡£
Java µÄÕâÒ»ÄÜÁ¦ÔÚʵ¼ÊÓ¦ÓÃÖÐÒ²ÐíÓõò»ÊǺܶ࣬µ«ÊÇÔÚÆäËüµÄ³ÌÐòÉè¼ÆÓïÑÔÖиù±¾¾Í²»´æÔÚÕâÒ»ÌØÐÔ¡£ÀýÈ磬Pascal¡¢C »òÕß C++ ÖоÍûÓа취ÔÚ³ÌÐòÖлñµÃº¯Êý¶¨ÒåÏà¹ØµÄÐÅÏ¢¡£
JavaBean ÊÇ reflection µÄʵ¼ÊÓ¦ÓÃÖ®Ò»£¬ËüÄÜÈÃһЩ¹¤¾ß¿ÉÊÓ»¯µÄ²Ù×÷Èí¼þ×é¼þ¡£ÕâЩ¹¤¾ßͨ¹ý reflection ¶¯Ì¬µÄÔØÈ벢ȡµÃ Java ×é¼þ(Àà) µÄÊôÐÔ¡£
1. Ò»¸ö¼òµ¥µÄÀý×Ó
¿¼ÂÇÏÂÃæÕâ¸ö¼òµ¥µÄÀý×Ó£¬ÈÃÎÒÃÇ¿´¿´ reflection ÊÇÈçºÎ¹¤×÷µÄ¡£
import java.lang.reflect.*;
public class DumpMethods {
public static void main(String args[]) {
try {
Class c = Class.forName(args[0]);
Method m[] = c.getDeclaredMethods();
for (int i = 0; i < m.length; i++)
System.out.println(m[i].toString());
} catch (Throwable e) {
System.err.println(e);
}
}
}
°´ÈçÏÂÓï¾äÖ´ÐУº
java DumpMethods java.util.Stack
ËüµÄ½á¹ûÊä³öΪ£º
public java.lang.Object java.util.Stack.push(java.lang.Object)
public synchronized java.lang.Object java.util.Stack.pop()
public synchronized java.lang.Object java.util.Stack.peek()
public boolean java.util.Stack.empty()
public synchronized int java.util.Stack.search(java.lang.Object)
ÕâÑù¾ÍÁгöÁËjava.util.Stack ÀàµÄ¸÷·½·¨ÃûÒÔ¼°ËüÃǵÄÏÞÖÆ·ûºÍ·µ»ØÀàÐÍ¡£
Õâ¸ö³ÌÐòʹÓà Class.forName ÔØÈëÖ¸¶¨µÄÀ࣬Ȼºóµ÷Óà getDeclaredMethods À´»ñÈ¡Õâ¸öÀàÖж¨ÒåÁ˵ķ½·¨ÁÐ±í¡£java.lang.reflect.Methods ÊÇÓÃÀ´ÃèÊöij¸öÀàÖе¥
Ïà¹ØÎĵµ£º
תÔØ×Ô http://littlefermat.blog.163.com/blog/static/59771167200962810120843/
Enum×÷ΪSunÈ«ÐÂÒý½øµÄÒ»¸ö¹Ø¼ü×Ö£¬¿´ÆðÀ´ºÜÏóÊÇÌØÊâµÄclass, ËüÒ²¿ÉÒÔÓÐ×Ô¼ºµÄ±äÁ¿£¬¿ÉÒÔ¶¨Òå×Ô¼ºµÄ·½·¨£¬¿ÉÒÔʵÏÖÒ»¸ö»òÕ߶à¸ö½Ó¿Ú¡£µ±ÎÒÃÇÔÚÉùÃ÷Ò»¸öenumÀàÐÍʱ£¬ÎÒÃÇÓ¦¸Ã×¢Òâµ½enumÀàÐÍÓÐÈçϵÄһЩÌØÕ÷¡£
1£®Ëü²»ÄÜÓÐpublicµÄ¹¹Ôìº¯Ê ......
´úÂë¿é£º¾ÍÊÇÓÃ{}À¨ÆðÀ´µ½²¿·Ö¡£¸ù¾ÝÓ¦ÓõIJ»Í¬·ÖΪ4Àà:ÆÕͨ´úÂë¿é¡¢¹¹Ôì¿é¡¢¾²Ì¬´úÂë¿é¡¢Í¬²½´úÂë¿é¡£
1.ÆÕͨ´úÂë¿é£º¶¨ÒåÔÚ·½·¨ÖеĴúÂë¿é¡£
È磺
public class Ex22 {
public static void main(String[] args){
// ÆÕͨ´úÂë¿é
{
int i = 3;
System.out.println("¾Ö²¿±äÁ¿Îª " + i);
}
int i = 5 ......
FLEX:
[Bindable] public var ary1:Array=[];
private function init():void{
ary1.push('»ÆÏþ»ª');
......
JAVA annotationÈëÃÅ
×î½ü¶ÔspringÔ´Âë¸ÐÐËȤ£¬½ñÌì¿´µ½annotation²¿·Ö£¬ÂÔ¼ÇÖ®¡£
Ò». ×î³£¼ûµÄannotation
@Override:ÓÃÔÚ·½·¨Ö®ÉÏ£¬ÓÃÀ´¸æËß±ðÈËÕâÒ»¸ö·½·¨ÊǸÄд¸¸ÀàµÄ
@Deprecated:½¨Òé±ðÈ˲»ÒªÊ¹ÓþɵÄAPIµÄʱºòÓõÄ,±àÒëµÄʱºò»áÓòúÉú¾¯¸æÐÅÏ¢,¿ÉÒÔÉ趨ÔÚ ......
package com.infowarelab.java.test;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
public class ReflectTester {
@SuppressWarnings("unchec ......