鍏卞悓瀛︿範錛屾榪庤漿杞姐傝漿杞借娉ㄦ槑鍦板潃銆?/span>http://blog.csdn.net/majianan/archive/2009/03/03/3952649.aspx銆戯紝璋㈣阿O(∩_∩)O錛?/span>
/******************************************
* 娌℃湁鐗堟潈 浠繪剰淇敼 鏀瑰ソ浜嗚鍙戠粰鎴戜竴浠?O(∩_∩)O
* Email錛?a href="mailto:jianan.ma@gmail.com" mce_href="mailto:jianan.ma@gmail.com">jianan.ma@gmail.com
* QQ:52524611
*******************************************/
鍔熻兘錛?錛夐紶鏍囨嫋鍔ㄥ垪瀹姐?錛夊弻鍑繪仮澶嶅垪瀹?/p>
]]>
銆怞avaScript銆戝垪琛紙Select錛夐夐」錛圤ption錛夌殑縐誨姩錛堜笂涓嬪乏鍙籌級
椹槈妤?nbsp; 2009-1-11
鍏卞悓瀛︿範錛屾榪庤漿杞姐傝漿杞借娉ㄦ槑鍦板潃銆?/span>http://blog.csdn.net/majianan/archive/2009/01/11/3754521.aspx銆戯紝璋㈣阿O(∩_∩)O錛?/span>
瀵廣?/span>銆怞avaScript銆戝垪琛ㄥ厓绱犱笂涓嬪乏鍙崇Щ鍔細Select鍜孫ption鐨勫簲鐢?/span>銆嬩腑鐨勬柟娉曡繘琛屼簡浼樺寲銆?/span>
1.浣跨敤appendChild錛堬級鏂規硶浼樺寲宸﹀彸縐誨姩鍑芥暟moveRight錛堬級
2.浣跨敤insertBefore錛堬級鏂規硶浼樺寲涓婁笅縐誨姩鍑芥暟moveUp錛堬級
3.淇敼鍚屾椂閫変腑澶氶」涓婁笅縐誨姩涓嶆甯哥殑Bug
鍔熻兘濡備笅錛?/span>
鏀寔涓嬈￠変腑澶氶」鍦ㄥ乏鍙沖垪琛ㄤ腑鏉ュ洖縐誨姩
浠ｇ爜濡備笅錛?/span>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Author" CONTENT="majianan">
<SCRIPT language=javascript>
var currentSel = null;
function setButton(obj){
if(obj.length==0) return;
currentSel = obj;
if(obj.id=="leftSel"){
document.getElementById("btnLeft").disabled = true;
document.getElementById("btnRight").disabled = false;
reSelect(document.getElementById("rightSel"));
}else{
document.getElementById("btnLeft").disabled = false;
document.getElementById("btnRight").disabled = true;
reSelect(document.getElementById("leftSel"));
}
}
function move(){
if(arguments.length==1){
moveUp(arguments[0]);
}else if(arguments.length==2){
moveRight(arguments[0],arguments[1]);
}
}
function moveUp(direction){
if(currentSel == null) return;
if(direction){//up
if (currentSel.selectedIndex > 0) {
for(var i=0;i<currentSel.length;i++){
if(currentSel[i].selected){
var oOption = currentSel.options[i];
var oPrevOption = currentSel.options[i---1];
currentSel.insertBefore(oOption, oPrevOption);
}
}
}
}else{//down
for(var i=currentSel.length-1;i>=0;i--){
if(currentSel[i].selected){
if(i==currentSel.length-1) return;
var oOption = currentSel.options[i];
var oNextOption = currentSel.options[i+1];
currentSel.insertBefore(oNextOption, oOption);
}
}
}
}
function moveRight(src,des){
if(src.selectedIndex==-1){
alert("Please select first!");
return;
}
for(var i=0;i<src.length;i++){
if(src[i].selected){
des.appendChild(src.options[i--]);
}
}
setButton(des);
}
function reSelect(obj){
for(var i=0; i<obj.length; i++){
if(obj[i].selected) obj[i].selected = false;
}
}
</SCRIPT>
</HEAD>
<BODY>
<form id="form1">
<table width="40%" align="center">
<tr>
<td>
<input type="button" value=" Up " id="btnUp" onClick="move(true);" style="width:65"/>
<br />
<input type="button" value=" Down " id="btnDowm" onClick="move(false);" style="width:65" />
</td>
<td>
<select multiple id="leftSel" onclick="setButton(this)" ondblclick="document.getElementById('btnRight').click()" style="height:200px;width:100px;">
<option value="1">Java</option>
<option value="2">JavaScript</option>
<option value="3">C++</option>
<option value="4">HTML</option>
</select>
</td>
<td>
<input type="button" value=" >> " id="btnRight" onClick="move(document.getElementById('leftSel'),document.getElementById('rightSel'));" style="width:65" />
<br />
<input type="button" value=" << " id="btnLeft" onClick="move(document.getElementById('rightSel'),document.getElementById('leftSel'));" style="width:65" />
</td>
<td>
<select multiple id="rightSel" onclick="setButton(this)" ondblclick="document.getElementById('btnLeft').click()" style="height:200px;width:100px;" >
<option value="5">CSS</option>
<option value="6">.Net</option>
</select>
</td>
</tr>
</table>
</form>
</BODY>
</HTML>
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Author" CONTENT="majianan">
<SCRIPT language=javascript>
var currentSel = null;
function setButton(obj){
if(obj.length==0) return;
currentSel = obj;
if(obj.id=="leftSel"){
document.getElementById("btnLeft").disabled = true;
document.getElementById("btnRight").disabled = false;
reSelect(document.getElementById("rightSel"));
}else{
document.getElementById("btnLeft").disabled = false;
document.getElementById("btnRight").disabled = true;
reSelect(document.getElementById("leftSel"));
}
}
function move(){
if(arguments.length==1){
moveUp(arguments[0]);
}else if(arguments.length==2){
moveRight(arguments[0],arguments[1]);
}
}
function moveUp(direction){
if(currentSel == null) return;
if(direction){//up
if (currentSel.selectedIndex > 0) {
for(var i=0;i<currentSel.length;i++){
if(currentSel[i].selected){
var oOption = currentSel.options[i];
var oPrevOption = currentSel.options[i---1];
currentSel.insertBefore(oOption, oPrevOption);
}
}
}
}else{//down
for(var i=currentSel.length-1;i>=0;i--){
if(currentSel[i].selected){
if(i==currentSel.length-1) return;
var oOption = currentSel.options[i];
var oNextOption = currentSel.options[i+1];
currentSel.insertBefore(oNextOption, oOption);
}
}
}
}
function moveRight(src,des){
if(src.selectedIndex==-1){
alert("Please select first!");
return;
}
for(var i=0;i<src.length;i++){
if(src[i].selected){
des.appendChild(src.options[i--]);
}
}
setButton(des);
}
function reSelect(obj){
for(var i=0; i<obj.length; i++){
if(obj[i].selected) obj[i].selected = false;
}
}
</SCRIPT>
</HEAD>
<BODY>
<form id="form1">
<table width="40%" align="center">
<tr>
<td>
<input type="button" value=" Up " id="btnUp" onClick="move(true);" style="width:65"/>
<br />
<input type="button" value=" Down " id="btnDowm" onClick="move(false);" style="width:65" />
</td>
<td>
<select multiple id="leftSel" onclick="setButton(this)" ondblclick="document.getElementById('btnRight').click()" style="height:200px;width:100px;">
<option value="1">Java</option>
<option value="2">JavaScript</option>
<option value="3">C++</option>
<option value="4">HTML</option>
</select>
</td>
<td>
<input type="button" value=" >> " id="btnRight" onClick="move(document.getElementById('leftSel'),document.getElementById('rightSel'));" style="width:65" />
<br />
<input type="button" value=" << " id="btnLeft" onClick="move(document.getElementById('rightSel'),document.getElementById('leftSel'));" style="width:65" />
</td>
<td>
<select multiple id="rightSel" onclick="setButton(this)" ondblclick="document.getElementById('btnLeft').click()" style="height:200px;width:100px;" >
<option value="5">CSS</option>
<option value="6">.Net</option>
</select>
</td>
</tr>
</table>
</form>
</BODY>
</HTML>
]]>
]]>
-- JavaScript 瀛︿範絎旇
椹槈妤?/span> 2008-12-19
var str = "hello";
str += " world";
str += " world";
鍚庡彴鎵鍋氬伐浣滐細
1錛夊垱寤哄瓨鍌?"hello" 鐨勫瓧絎︿覆錛屼笖浣?str 鎸囧悜瀹冦?/span>
2錛夊垱寤哄瓨鍌?"world" 鐨勫瓧絎︿覆銆?/span>
3錛夊垱寤哄瓨鍌ㄧ粨鏋滅殑瀛楃涓層?/span>
4錛夊皢 str 涓殑褰撳墠鍐呭澶嶅埗鍒扮粨鏋滃瓧絎︿覆涓?/span>
5錛夋妸 world 澶嶅埗鍒扮粨鏋滃瓧絎︿覆涓?/span>
6錛夋洿鏂?str 錛屼嬌 str 鎸囧悜緇撴灉瀛楃涓層?/span>
姣忔嫾鎺ヤ竴嬈″瓧絎︿覆灝卞驚鐜噸澶?錛墌6錛夛紝濡傛灉閲嶅鎴愮櫨涓婂崈嬈″垯浼氶潪甯告秷鑰楄祫婧愶紝褰卞搷鎬ц兘銆?/span>
瑙ｅ喅鏂規硶錛?/span>
浣跨敤 Array 瀵硅薄瀛樺偍瀛楃涓詫紝涔嬪悗浣跨敤 join錛堬級鏂規硶杈撳嚭緇撴灉銆?/span>
浠跨収 Java 涓殑 StringBuffer 綾匯?/span>
function StringBuffer(){
this._strings = new Array;
}
StringBuffer.prototype.append = function (str){
this._strings.push(str);
}
StringBuffer.prototype.toString = function (){
return this._strings.join("");
}
this._strings = new Array;
}
StringBuffer.prototype.append = function (str){
this._strings.push(str);
}
StringBuffer.prototype.toString = function (){
return this._strings.join("");
}
嫻嬭瘯鎬ц兘錛?/span>
浠ｇ爜1錛氫嬌鐢?"+=" 鎷兼帴瀛楃涓?/span>
var d = new Date();
var str = "";
for(var i=0;i<10000;i++){
str += "test";
}
var d2 = new Date();
document.writeln(d2.getTime()-d.getTime());
var str = "";
for(var i=0;i<10000;i++){
str += "test";
}
var d2 = new Date();
document.writeln(d2.getTime()-d.getTime());
浠ｇ爜2錛氫嬌鐢?StringBuffer
var d = new Date();
var str = new StringBuffer();
for(var i=0;i<10000;i++){
str.append("test");
}
var res = str.toString();
var d2 = new Date();
document.writeln(d2.getTime()-d.getTime());
var str = new StringBuffer();
for(var i=0;i<10000;i++){
str.append("test");
}
var res = str.toString();
var d2 = new Date();
document.writeln(d2.getTime()-d.getTime());
浠庡嬈℃祴璇曠粨鏋滅湅鏉ワ紝浣跨敤StringBuffer 鍙互鑺傜渷50%浠ヤ笂鐨勬椂闂淬?/span>
]]>
]]>
]]>
1 = SMALLINT
2 = INTEGE R
3 = FLOAT
4 = SMALLFLOAT
5 = DECIMAL
6 = SERIAL *
7 = DATE
8 = MONEY
9 = NULL
10 = DATETIME
11 = BYTE
12 = TEXT
13 = VARCHAR
14 = INTERVAL
15 = NCHAR
16 = NVARCHAR
17 = INT8
18 = SERIAL8 *
19 = SET
20 = MULTISET
21 = LIST
22 = Unnamed ROW
40 = Variable-length opaque type (LVARCHAR)
4118 = Named ROW
濡傛灉錛屾煇瀛楁瑕佹眰闈炵┖錛屽垯鍦ㄥ師鏁板瓧涓婂姞256錛?br />
濡傦細鏌愬瓧孌礳oltype=262,閭ｄ箞,262-256=6錛岃瀛楁灝卞簲璇ヤ負錛歋ERIAL not NULL 綾誨瀷錛?br />
]]>
--How constructors differ from methods
Platypus p1 = new Platypus();
鐩告瘮涔嬩笅,鏂規硶錛坢ethod錛夌殑鐩殑鏄懼緱鏇翠負鏅? 涓涓柟娉曠殑鍩烘湰鍔熻兘灝辨槸涓轟簡鎵цJava鐨勪唬鐮?
Signature differences錛堢鍚嶅尯鍒級錛?/span>Signature 涓嶇煡閬撴庝箞緲昏瘧濂斤級
鏋勯犲嚱鏁幫紙constructors錛夊拰鏂規硶錛坢ethods錛夊湪浠ヤ笅涓変釜鏂歸潰瀛樺湪宸埆錛?br>
· 淇グ絎?nbsp; 錛坢odifiers錛?br>· 榪斿洖綾誨瀷錛坮eturn type錛?br>· 鍚嶅瓧 錛坣ame錛?br>
鍍忔柟娉曚竴鏍鳳紝鏋勯犲嚱鏁板彲浠ユ湁浠繪剰涓縐嶈闂慨楗扮錛坅ccess modifiers錛夛細鍏叡鐨勶紙public錛夛紝淇濇姢鐨勶紙protected錛夛紝縐佹湁鐨勶紙private錛夋垨鑰呮病鏈夛紙甯歌縐頒負package鎴栬協riendly錛夈備笉鍚屼簬鏂規硶鐨勬槸錛屾瀯閫犲嚱鏁板彧鑳借璁塊棶淇グ絎﹁繘琛岄檺瀹氥傚洜姝わ紝鏋勯犲嚱鏁頒笉鑳芥槸abstract, static, final, natice or synchronized鐨勩?nbsp;
涓よ呯殑榪斿洖綾誨瀷錛坮eturn type錛変篃鏄埅鐒朵笉鍚岀殑銆傛柟娉曞彲浠ユ嫢鏈変換浣曟湁鏁堢殑榪斿洖綾誨瀷錛屾垨鑰呮柟娉曟病鏈夎繑鍥炲鹼紝榪欑鎯呭喌涓嬫柟娉曠殑榪斿洖綾誨瀷涓簐oid銆傛瀯閫犲嚱鏁版病鏈夎繑鍥炵被鍨嬶紝涔熸病鏈塿oid銆?br>
鏈鍚庯紝鏋勯犲嚱鏁板拰鏂規硶鍦ㄥ彇鍚嶆柟闈篃鏈夊緢澶х殑涓嶅悓銆傛瀯閫犲嚱鏁板悕瀛椾笌鍏剁被鍚嶏紙class name錛夌浉鍚岋紱鎸夌収鎯緥錛屾柟娉曚嬌鐢ㄥ叾浠栦笌綾誨悕涓嶇浉鍚岀殑鍚嶅瓧銆傚鏋淛ava紼嬪簭鍛橀伒寰氬父鎯緥錛屾柟娉曞悕灝嗕細浠ュ皬鍐欏瓧姣嶅紑澶達紝鏋勯犲嚱鏁板悕瀛椾互澶у啓瀛楁瘝寮澶淬傚茍涓旓紝鍥犱負涓庣被鍚嶇浉鍚岋紝鏋勯犲嚱鏁板悕瀛楅氬父鏄釜鍚嶈瘝錛屾柟娉曞悕瀛楁槸涓姩璇嶃?br>
The use of "this" 錛坱his鐨勪嬌鐢級
鏋勯犲嚱鏁板拰鏂規硶浣跨敤鍏抽敭瀛?this 宸埆寰堝ぇ銆?br>
鏂規硶涓殑 this 鎸囩殑鏄墽琛岃鏂規硶鐨勭被鐨勫疄渚嬶紙instance錛夈傞潤鎬佹柟娉曪紙static method錛変笉浣跨敤 this 銆傚洜涓洪潤鎬佹柟娉曚笉灞炰簬浠諱綍涓涓被鐨勫疄渚嬶紝鎵浠?this 鏃犳墍鎸囧悜銆傞潤鎬佹柟娉曟諱綋涓婂睘浜庝竴涓被鑰岄潪涓涓被鐨勫疄渚嬨?br>
鏋勯犲嚱鏁頒腑鐨?this 鎸囩殑鏄紝鍦ㄥ悓涓涓被涓嫢鏈変笉鍚岀殑鍙傛暟鍒楄〃鐨勫彟涓涓瀯閫犲嚱鏁般備唬鐮佸涓嬶細
public class Platypus {
String name;
Platypus(String input) {
name = input;
}
Platypus() {
this("John/Mary Doe");
}
public static void main(String args[]) {
Platypus p1 = new Platypus("digger");
Platypus p2 = new Platypus();
}
}
String name;
Platypus(String input) {
name = input;
}
Platypus() {
this("John/Mary Doe");
}
public static void main(String args[]) {
Platypus p1 = new Platypus("digger");
Platypus p2 = new Platypus();
}
}
鍦ㄤ唬鐮佷腑錛屾湁涓や釜鏋勯犲嚱鏁般?br>絎竴涓瀯閫犲嚱鏁伴氳繃涓涓猄tring鍙傛暟input緇檔ame榪涜璧嬪箋?br>絎簩涓瀯閫犲嚱鏁版病鏈夊弬鏁幫紝閫氳繃榛樿鐨勫悕瀛?John/Mary Doe"鏉ヨ皟鐢ㄧ涓涓瀯閫犲嚱鏁般?br>
濡傛灉鍦ㄦ瀯閫犲嚱鏁頒腑浣跨敤 this錛屽垯蹇呴』鍦ㄦ瀯閫犲嚱鏁扮殑絎竴琛屼唬鐮佸綋涓紝鍚﹀垯緙栬瘧鍣ㄤ細鎶ラ敊銆?br>娉細鍦ㄦ垜榪欓噷鐨勬姤閿欎俊鎭負 Constructor call must be the first statement in a constructor銆?br>
The use of "super"錛坰uper鐨勪嬌鐢級
鏂規硶鍜屾瀯閫犲嚱鏁頒嬌鐢?super 鐨勬椂鍊欙紝鎸囩殑閮芥槸瓚呯被錛坰uperclass錛夛紝浣嗕篃鏈夋墍涓嶅悓銆?br>
鏂規硶涓嬌鐢?super 灝嗕細鎵ц瓚呯被涓瑕嗙洊鐨勬柟娉曪紝濡備笅鎵紺猴細
class Mammal {
void getBirthInfo() {
System.out.println("born alive.");
}
}
class Platypus extends Mammal {
void getBirthInfo() {
System.out.println("hatch from eggs");
System.out.print("a mammal normally is ");
super.getBirthInfo();
}
}
void getBirthInfo() {
System.out.println("born alive.");
}
}
class Platypus extends Mammal {
void getBirthInfo() {
System.out.println("hatch from eggs");
System.out.print("a mammal normally is ");
super.getBirthInfo();
}
}
鍦ㄤ笂闈唬鐮佷腑錛宻uper.getBirthInfo() 灝嗕細璋冪敤瓚呯被 Mammal 涓瑕嗙洊鐨勬柟娉?getBirthInfo().
鏋勯犲嚱鏁頒腑浣跨敤 super 灝嗕細璋冪敤瓚呯被涓殑鏋勯犲嚱鏁般?br>濡傛灉鍦ㄦ瀯閫犲嚱鏁頒腑浣跨敤 super錛屽垯蹇呴』鍦ㄦ瀯閫犲嚱鏁扮殑絎竴琛屼唬鐮佸綋涓紝鍚﹀垯緙栬瘧鍣ㄤ細鎶ラ敊銆?br>娉細鍦ㄦ垜榪欓噷鐨勬姤閿欎俊鎭負 Constructor call must be the first statement in a constructor銆?br>
浠ｇ爜濡備笅錛?br>
public class SuperClassDemo {
SuperClassDemo() {}
}
class Child extends SuperClassDemo {
Child() {
super();
}
}
SuperClassDemo() {}
}
class Child extends SuperClassDemo {
Child() {
super();
}
}
Complier -- supplied code錛堢紪璇戝櫒鎻愪緵鐨勪唬鐮侊級
褰撶紪璇戝櫒鑷姩涓烘瀯閫犲嚱鏁版彁渚涗唬鐮佺殑鏃跺欙紝Java鍒濆鑰呭彲鑳戒細鎰熷埌鍥版儜銆傚鏋滀綘鐨勭被涓病鏈夋瀯閫犲嚱鏁幫紝緙栬瘧鍣ㄥ皢浼氫負浣犺嚜鍔ㄦ彁渚涗竴涓病鏈夊弬鏁扮殑鏋勯犲嚱鏁般傚鏋滀綘鐨勪唬鐮佸涓嬶細
public class Example {}
鍔熻兘涓婂畠絳夊悓浜庡涓嬩唬鐮侊細
public class Example {
Example() {}
}
Example() {}
}
濡傛灉鍦ㄤ綘鐨勬瀯閫犲嚱鏁扮殑絎竴琛屼唬鐮佸綋涓病鏈変嬌鐢?super錛岄偅涔堢紪璇戝櫒浼氳嚜鍔ㄤ負浣犳彁渚涗唬鐮侊紝鎻掑叆 super銆?br>濡傛灉浣犵殑浠ｇ爜濡備笅錛?br>
public class TestConstructors {
TestConstructors() {}
}
TestConstructors() {}
}
鍔熻兘涓婂畠絳夊悓浜庡涓嬩唬鐮侊細
public class TestConstructors {
TestConstructors() {
super();
}
}
TestConstructors() {
super();
}
}
鍒濆鑰呭彲鑳戒細鏈夌枒闂細TestConstructors 騫舵病鏈夌戶鎵夸換浣曠被錛屼負浠涔堝畠浼氳皟鐢ㄧ埗綾葷殑鏋勯犲嚱鏁板憿錛?br>絳旀鏄細鍦?Java 涓鏋滄病鏈夋樉紺虹殑緇ф壙涓涓被錛屽垯榛樿涓虹戶鎵胯嚜 Object 綾匯?br>
濡傛灉娌℃湁鏄劇ず鐨勫０鏄庝竴涓瀯閫犲嚱鏁幫紝緙栬瘧鍣ㄨ嚜鍔ㄦ彁渚涗竴涓病鏈夊弬鏁扮殑鏋勯犲嚱鏁幫紱濡傛灉涓涓瀯閫犲嚱鏁版病鏈夋樉紺虹殑 super 璋冪敤錛岀紪璇戝櫒鑷姩鎻愪緵涓涓病鏈夊弬鏁扮殑 super 璋冪敤銆傛墍浠ヤ笅闈㈢殑涓ゆ浠ｇ爜鍦ㄥ姛鑳戒笂鏄瓑浠風殑錛?br>
public class Example {}
鍜?br>
public class Example {
Example() {
super();
}
}
Example() {
super();
}
}
Inheritance錛堢戶鎵匡級
涓嬮潰鎯呭喌鏈変粈涔堜笉瀵癸紵
寰嬪笀闃呰綾籄鐨勯仐鍢便傛墍鏈夊搴垚鍛樺洿鍧愬湪澶т細璁鏃侊紝騫朵笖鏈変簺浜哄湪杞誨０鍛滃捊銆傚緥甯堣鍒幫細“鎴戯紝綾籄錛屽ご鑴戞竻妤氳韓浣撳仴搴鳳紝灝嗘垜鎵鏈夌殑鏋勯犲嚱鏁扮暀緇欐垜鐨勫瀛?#8221;銆?br>
闂鏄瀯閫犲嚱鏁頒笉鏄氳繃緇ф壙寰楀埌鐨勩傜劧鑰屽垢榪愮殑鏄紝瀛愮被鍙互鑷姩鐨勭戶鎵跨埗綾繪墍鏈夌殑鏂規硶錛屾墍浠ュ瓙綾誨茍涓嶆槸涓鏃犳墍鏈夈?br>
璁頒綇錛欽ava 鏂規硶鍙互閫氳繃緇ф壙寰楀埌錛岃屾瀯閫犲嚱鏁頒笉琛屻傜湅涓嬮潰浠ｇ爜錛?br>
public class Example {
public void sayHi {
system.out.println("Hi");
}
Example() {}
}
public class SubClass extends Example {
}
public void sayHi {
system.out.println("Hi");
}
Example() {}
}
public class SubClass extends Example {
}
綾?SubClass 鑷姩緇ф壙鐖剁被鐨?sayHi 鏂規硶銆傜劧鑰岋紝鏋勯犲嚱鏁?Example() 涓嶄細琚被 SubClass 鎵緇ф壙銆?br>
Summarizing the differences
鏋勯犲嚱鏁頒笌鏂規硶鐨勫尯鍒氨鍍忛腑鍢村吔涓庡吀鍨嬬殑鍝轟鉤鍔ㄧ墿涓鏍楓傚挨鍏舵槸鍦ㄧ洰鐨勶紙purpose錛夛紝絳懼悕錛坰ignature錛夛紝鍜?this 涓?super 鐨勪嬌鐢ㄦ柟闈€傚彟澶栵紝鍦ㄧ戶鎵垮拰緙栬瘧鍣ㄦ彁渚涗唬鐮佹柟闈篃鏈夊緢澶у樊寮傘傝浣忔墍鏈夌殑鍖哄埆鍙兘浼氶潪甯歌緵鑻︼紝鎵浠ヤ笅闈㈡彁渚涚殑涓涓〃鏍鹼紝綆鍗曠殑姒傛嫭浜嗛噸瑕佺殑宸紓鏂歸潰銆?br>
| Topic | Constructors | Methods |
|---|---|---|
| Purpose | Create an instance of a class | Group Java statements |
| Modifiers | Cannot be abstract, final, native, static, or synchronized | Can be abstract, final, native, static, or synchronized |
| Return type | No return type, not even void | void or a valid return type |
| Name | Same name as the class (first letter is capitalized by convention) -- usually a noun | Any name except the class. Method names begin with a lowercase letter by convention -- usually the name of an action |
| this | Refers to another constructor in the same class. If used, it must be the first line of the constructor | Refers to an instance of the owning class. Cannot be used by static methods |
| super | Calls the constructor of the parent class. If used, must be the first line of the constructor | Calls an overridden method in the parent class |
| Inheritance | Constructors are not inherited | Methods are inherited |
| Compiler automatically supplies a default constructor | If the class has no constructor, a no-argument constructor is automatically supplied | Does not apply |
| Compiler automatically supplies a default call to the superclass constructor | If the constructor makes no zero-or-more argument calls to super, a no-argument call to super is made | Does not apply |
鍘熸枃錛?a >http://www.javaworld.com/jw-10-2000/jw-1013-constructors.html
]]>
椹槈妤?/a> 2007-04-19
濡傛灉鎯崇敤闈濲ava浠ｇ爜鏉ョ紪鍐欑▼搴忥紝鎴栬呴渶瑕佺洿鎺ユ搷綰電‖浠訛紝姝ゆ椂錛屼綘鍙互緙栧啓鏈満鏂規硶(native method)銆?/p>
native鍏抽敭瀛楀氨鏄敤鏉ュ０鏄庢湰鏈烘柟娉?native method)鐨勩備竴鏃﹀０鏄庯紝榪欎簺鏈満鏂規硶鍙互鍦↗ava紼嬪簭涓璋冪敤錛屽氨鍍忚皟鐢ㄥ叾浠朖ava鏂規硶涓鏍楓?br>
native method 鐢–/C++璇█瀹炵幇錛屽茍涓旇緙栬瘧鎴怐LL錛岃繖浜涘嚱鏁扮殑瀹炵幇浣撳湪DLL涓紝鍦↗ava涓湰鏈烘柟娉曚綋鍙槸涓涓垎鍙楓?/p>
渚嬪鍚戞搷浣滅郴緇熻姹傛満鍣ㄧ殑CPU緙栧彿鏂規硶錛屽涓嬶細
public native int getCPUID();
native method 浠ュ彲浠ヨ閲嶈澆鎴栬呰鐩栵紝涔熷彲浠ユ槸final, static, synchronized, public, protected, private 鐨勩備絾鏄湰鏈烘柟娉曚笉鑳藉０鏄庝負abstract鎴栬卻trictfp綾誨瀷銆?br>
]]>
public class Fibonacci {
private static int MAX = 100;
/*
* print the Fibonacci sequence for values < MAX
*/
public static void main(String[] args) {
int currentVal = 1;
int nextVal = 1;
while(currentVal<MAX){
System.out.println(currentVal);
nextVal = nextVal + currentVal ;
currentVal = nextVal - currentVal;
}
}
}
private static int MAX = 100;
/*
* print the Fibonacci sequence for values < MAX
*/
public static void main(String[] args) {
int currentVal = 1;
int nextVal = 1;
while(currentVal<MAX){
System.out.println(currentVal);
nextVal = nextVal + currentVal ;
currentVal = nextVal - currentVal;
}
}
}
]]>
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 椹槈妤?/font>聽聽聽 2007騫?鏈?鏃?br />
鏂板勾絎竴綃囷紒甯屾湜鏂扮殑涓騫村ぇ瀹跺拰鎴戜竴鏍峰ぉ澶╁紑蹇冿紝鑳藉瀛︾偣涓滆タ錛屽澶氳禋閽盺-^
鍦ㄧ敤鎴烽亣鍒伴渶瑕佽緭鍏ュ瘑鐮佺殑欏甸潰鏃跺欙紝瀵嗙爜涓槸鍚︽湁澶у啓瀛楁瘝錛熷ぇ鍐欓敭錛圕aps Lock錛夋槸鍚︽墦寮錛熷鏋滆兘緇欑敤鎴蜂互鎻愮ず錛屽矀涓嶆槸鏇村ソ錛?br />
涓嬮潰鐨勭ず渚嬩唬鐮佺粰鍑轟簡鏂規硶錛屽繀瑕佺殑璇存槑浠ｇ爜褰撲腑閮芥湁娉ㄩ噴銆?br />闂腑鐭ヨ瘑鐐癸細event.keyCode聽 鍜?event.shiftKey
濡傛灉鏈変笉瀵癸紝涓嶆槑鐧藉湴鏂規垨鑰呮湁鏇村ソ鐨勫緩璁紝璇峰憡璇夋垜錛佽阿璋+^
HTML欏甸潰浠ｇ爜
<!
DOCTYPE聽HTML聽PUBLIC聽"-//W3C//DTD聽HTML聽4.0聽Transitional//EN"
>
< HTML >
< HEAD >
< TITLE > 聽Detect聽Caps聽Lock </ TITLE >
< script >
function 聽detectCapsLock(e){
聽聽聽聽valueCapsLock聽 = 聽e.keyCode ? e.keyCode:e.which; // Caps聽Lock銆鏄惁鎵撳紑
聽聽聽聽valueShift聽 = 聽e.shiftKey ? e.shiftKey:((valueCapsLock聽 == 聽 16 ) ? true : false ); // shift閿槸鍚︽寜浣?br />
聽聽聽聽 if (((valueCapsLock聽 >= 聽 65 聽 && 聽valueCapsLock聽 <= 聽 90 )聽 && 聽 ! valueShift) // Caps聽Lock聽鎵撳紑錛屽茍涓斅爏hift閿病鏈夋寜浣?/span>
聽聽聽聽 || ((valueCapsLock聽 >= 聽 97 聽 && 聽valueCapsLock聽 <= 聽 122 )聽 && 聽valueShift)) // Caps聽Lock聽鎵撳紑錛屽茍涓旀寜浣徛爏hift閿?/span>
聽聽聽聽聽聽聽聽document.getElementById('capStatus').style.visibility聽 = 聽'visible';
聽聽聽聽 else
聽聽聽聽聽聽聽聽document.getElementById('capStatus').style.visibility聽 = 聽'hidden';
聽聽 /*
聽聽javascript涓璳eyCode浠ｇ爜瀵瑰簲琛?br />聽聽event.keyCode=32聽聽聽聽聽聽聽聽絀烘牸
聽聽event.keyCode=13聽聽聽聽聽聽聽聽鍥炶濺
聽聽event.keyCode=27聽聽聽聽聽聽聽聽Esc
聽聽event.keyCode=16)聽聽聽聽聽聽聽聽Shift
聽聽event.keyCode=17)聽聽聽聽聽聽聽聽Ctrl
聽聽event.keyCode=18)聽聽聽聽聽聽聽聽Alt
聽聽 */
}
</ script >
</ HEAD >
< BODY >
< input聽 type ="password" 聽name ="pwd" 聽onkeypress ="detectCapsLock(event)" 聽 />
< div聽 id ="capStatus" 聽style ="visibility:hidden" >< font聽 color =red > Caps聽Lock聽is聽on. < font ></ div >
</ BODY >
</ HTML >
< HTML >
< HEAD >
< TITLE > 聽Detect聽Caps聽Lock </ TITLE >
< script >
function 聽detectCapsLock(e){
聽聽聽聽valueCapsLock聽 = 聽e.keyCode ? e.keyCode:e.which; // Caps聽Lock銆鏄惁鎵撳紑
聽聽聽聽valueShift聽 = 聽e.shiftKey ? e.shiftKey:((valueCapsLock聽 == 聽 16 ) ? true : false ); // shift閿槸鍚︽寜浣?br />
聽聽聽聽 if (((valueCapsLock聽 >= 聽 65 聽 && 聽valueCapsLock聽 <= 聽 90 )聽 && 聽 ! valueShift) // Caps聽Lock聽鎵撳紑錛屽茍涓斅爏hift閿病鏈夋寜浣?/span>
聽聽聽聽 || ((valueCapsLock聽 >= 聽 97 聽 && 聽valueCapsLock聽 <= 聽 122 )聽 && 聽valueShift)) // Caps聽Lock聽鎵撳紑錛屽茍涓旀寜浣徛爏hift閿?/span>
聽聽聽聽聽聽聽聽document.getElementById('capStatus').style.visibility聽 = 聽'visible';
聽聽聽聽 else
聽聽聽聽聽聽聽聽document.getElementById('capStatus').style.visibility聽 = 聽'hidden';
聽聽 /*
聽聽javascript涓璳eyCode浠ｇ爜瀵瑰簲琛?br />聽聽event.keyCode=32聽聽聽聽聽聽聽聽絀烘牸
聽聽event.keyCode=13聽聽聽聽聽聽聽聽鍥炶濺
聽聽event.keyCode=27聽聽聽聽聽聽聽聽Esc
聽聽event.keyCode=16)聽聽聽聽聽聽聽聽Shift
聽聽event.keyCode=17)聽聽聽聽聽聽聽聽Ctrl
聽聽event.keyCode=18)聽聽聽聽聽聽聽聽Alt
聽聽 */
}
</ script >
</ HEAD >
< BODY >
< input聽 type ="password" 聽name ="pwd" 聽onkeypress ="detectCapsLock(event)" 聽 />
< div聽 id ="capStatus" 聽style ="visibility:hidden" >< font聽 color =red > Caps聽Lock聽is聽on. < font ></ div >
</ BODY >
</ HTML >
]]>
聽
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 椹槈妤?/font> 聽聽聽2006-12-19
鍦ㄧ綉欏典腑閫傚綋鐨勪嬌鐢╓ebdings瀛椾綋,鍙互浣跨綉欏墊洿鍔犵編瑙?
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鏁板瓧瀵瑰簲鐨剋ebdings瀛椾綋:
0 聽聽聽1 聽聽聽2 聽聽聽3 聽聽聽4 聽聽聽5 聽聽聽6 聽聽聽7 聽聽聽8 聽聽聽9
0 1 2 3 4 5 6 7 8 9
鑻辨枃灝忓啓瀛楁瘝瀵瑰簲鐨剋ebdings瀛椾綋:
a 聽聽聽b 聽聽聽c 聽聽聽d 聽聽聽e 聽聽聽f 聽聽聽g 聽聽聽h 聽聽聽i 聽聽聽j 聽聽聽k 聽聽聽l 聽聽聽m
a b c d e f g h i j k l m
n 聽聽聽o 聽聽聽p 聽聽聽q 聽聽聽r 聽聽聽s 聽聽聽t 聽聽聽u 聽聽聽v 聽聽聽w 聽聽聽x 聽聽聽y 聽聽聽z
n o p q r s t u v w x y z
鑻辨枃澶у啓瀛楁瘝瀵瑰簲鐨剋ebdings瀛椾綋:
A 聽聽聽B 聽聽C 聽聽D 聽聽E 聽聽F聽聽聽G 聽聽H 聽聽聽I 聽聽聽J聽聽聽K 聽聽聽L 聽聽聽M
A B C D E F G H I J K L M
N 聽聽聽O 聽聽P 聽聽Q 聽聽R 聽聽S 聽聽T 聽聽U 聽聽V 聽W X 聽Y 聽聽Z
N O P Q R S T U V W X Y Z
鐗規畩瀛楃瀵瑰簲鐨剋ebdings瀛椾綋:
鐗規畩瀛楃:
` 聽聽聽聽! 聽聽聽@ 聽聽聽# 聽聽$ 聽聽聽% 聽聽^ 聽聽& 聽
webdings瀛椾綋:
` ! @ # $ % ^ &
鐗規畩瀛楃:
*聽聽聽聽( 聽聽聽聽) 聽聽聽聽-聽聽聽聽+ 聽聽聽|聽聽聽聽-聽聽聽聽=
webdings瀛椾綋:
* ( ) - + | - =
鐗規畩瀛楃:
[ 聽聽聽聽]聽聽聽聽{ 聽聽聽聽} 聽聽聽; 聽聽聽' 聽聽聽聽: 聽聽聽聽"
webdings瀛椾綋:
[ ] { } ; ' : "
鐗規畩瀛楃:
< 聽聽聽聽> 聽聽聽聽,聽聽聽聽.聽聽聽聽\聽聽聽聽/ 聽聽聽聽?
webdings瀛椾綋:
< > , . \ / ?
]]>
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 椹槈妤?/font> 2006-12-09
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