{
聽(tīng)public static void main(String[] args)
聽(tīng){
聽(tīng)聽(tīng)System.out.println(decisive());
聽(tīng)}
聽(tīng)static boolean decisive()
聽(tīng){
聽(tīng)聽(tīng)try
聽(tīng)聽(tīng){
聽(tīng)聽(tīng)聽(tīng)return true;
聽(tīng)聽(tīng)}
聽(tīng)聽(tīng)finally
聽(tīng)聽(tīng){
聽(tīng)聽(tīng)聽(tīng)return false;
聽(tīng)聽(tīng)}
聽(tīng)}
}
聽(tīng)聽(tīng)聽(tīng)浣犲彲鑳借涓鴻繖涓▼搴忎笉鍚堟硶銆傛瘯绔燂紝decisive鏂規(guī)硶涓嶈兘鍚屾椂榪斿洖true鍜宖alse銆傚鏋滀綘灝濊瘯涓涓嬶紝灝變細(xì)鍙戠幇瀹?br />緙栬瘧鏃舵病鏈変換浣曢敊璇紝騫朵笖瀹冩墦鍗扮殑鏄痜alse銆備負(fù)浠涔堝憿?
聽(tīng)聽(tīng)聽(tīng) 鍘熷洜鍦ㄤ簬灝辨槸鍦細(xì)鍦ㄤ竴涓猼ry-finally璇彞涓紝finally璇彞鍧楁繪槸鍦ㄦ帶鍒舵潈紱誨紑try璇彞鍧楁椂鎵ц銆傛棤璁簍ry
璇彞鍧楁槸姝ｅ父緇撴潫鐨勶紝榪樻槸鎰忓緇撴潫錛屾儏鍐甸兘鏄姝ゃ傚湪涓鏉¤鍙ユ垨涓涓鍙ュ潡鎶涘嚭涓涓紓甯革紝鎴栬呭鏌愪釜灝侀棴綾誨瀷璇彞鎵ц浜?jiǎn)涓涓猙reak鎴朿ontinue錛屾垨鏄儚榪欎釜紼嬪簭涓鏍鋒墽琛屼簡(jiǎn)涓涓猺eturn鏃訛紝灝嗗彂鐢熸剰澶栫粨鏉熴備箣鎵浠ョО涓烘剰澶栫粨鏉燂紝鏄洜涓哄畠浠樆姝㈢▼搴忔寜欏哄簭鎵ц涓嬮潰鐨勮鍙ャ?br />聽(tīng)聽(tīng)聽(tīng) 褰搕ry璇彞鍧楀拰finally璇彞鍧楅兘鎰忓緇撴潫鏃訛紝鍦╰ry璇彞鍧椾腑寮曞彂鎰忓緇撴潫鐨勫師鍥犲皢琚涪寮冿紝鑰屾暣涓猼ry-finally
璇彞鎰忓緇撴潫鐨勫師鍥犲皢涓巉inally璇彞鍧楁剰澶栫粨鏉熺殑鍘熷洜鐩稿悓銆傚湪榪欎釜紼嬪簭涓紝鍦╰ry璇彞鍧椾腑鐨剅eturn璇彞鎵
寮曞彂鐨勬剰澶栫粨鏉熷皢琚涪寮冿紝鑰宼ry-finally璇彞鎰忓緇撴潫鏄敱finally璇彞鍧椾腑鐨剅eturn閫犳垚鐨勩傜畝鍗曠殑璁詫紝紼嬪簭
灝濊瘯鐫(try)榪斿洖(return)true,浣嗘槸瀹冩渶緇?finally)榪斿洖(return)鐨勬槸false銆?br />聽(tīng)聽(tīng)聽(tīng) 鎬諱箣錛屾瘡涓涓猣inally璇彞鍧楅兘搴旇姝ｅ父緇撴潫錛岄櫎闈炴姏鍑轟笉鍙楁鏌ョ殑寮傚父銆傚崈涓囦笉瑕佺敤return,break,continue鎴杢hrow鏉ラ鍑篺inally璇彞鍧楋紝騫朵笖鍗冧竾涓嶈鍏佽璁╁彈媯(gè)鏌ョ殑寮傚父浼犳挱鍒癴inally璇彞鍧椾箣澶栥?/p>
]]>
聽(tīng)聽(tīng)聽(tīng)聽(tīng) 緙栧啓涓涓▼搴忚В鍐寵繖涓棶棰?
code:
class Change
{
聽(tīng)public static void main(String[] args)
聽(tīng){
聽(tīng)聽(tīng)System.out.println(2.00-1.10);
聽(tīng)}
}
聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) blovesage鍐欎笅榪欐浠ｇ爜鎴戜滑鏈熸湜寰楀埌搴旇鎵懼洖鐨勯浂閽?.90,浣嗘槸褰撹繍琛屽悗浠栧彂鐜版暟鎹笉鍏戯紝榪愯緇撴灉涓?0.8999999999999999,涓庨鏈熺殑0.90涓嶄竴鏍楓備負(fù)浠涔堝憿?鎼炰簡(jiǎn)鍗婂ぉ鍘熷洜鍦ㄤ簬1.1榪欎釜鏁頒笉鑳借綺劇‘鐨勮〃紺轟負(fù)涓涓猟ouble,鍥犳琚〃紺轟負(fù)鏈鎺ヨ繎瀹冪殑double鍊?璇ョ▼搴忎粠2涓噺鍘昏繖涓煎緱.閬楁喚鐨勬槸,榪欎釜緇撴灉鎵撳嵃鍑烘潵騫朵笉鏄帴榪?.9鐨刣ouble鍊?榪欒鏄? 騫朵笉鏄墍鏈夌殑灝忔暟閮藉彲浠ョ敤浜岃繘鍒舵誕鐐規(guī)暟綺劇‘琛ㄧず.浜岃繘鍒舵誕鐐瑰浜庤揣甯佽綆楁槸闈炲父涓嶉傚悎鐨?
聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) 瑕佽В鍐寵繖涓棶棰樻湁涓や釜鍔炴硶:涓鏄嬌鐢ㄦ煇縐嶆暣鏁扮被鍨?渚嬪int鎴杔ong,騫朵笖鍒嗗崟浣嶆潵璁＄畻.濡備笅:
System.out.println((200-110)+"fen");
緇撴灉涓?0鍒?浜屾槸浣跨敤鎵ц灝忔暟榪愮畻鐨凚igDecimal.瀹冭繕鍙互閫氳繃JDBC涓嶴QL DECIMAL綾誨瀷榪涜浜掓搷浣?榪欓噷闇瑕佹敞鎰忕殑鏄? 涓瀹氳鐢˙igDecimal(String)鏋勯犲櫒,鑰屽崈涓囦笉瑕佺敤BigDecimal(double).鍚庝竴涓瀯閫犲櫒灝嗙敤瀹冪殑鍙傛暟鍊兼潵鍒涘緩涓涓疄渚?渚嬪new BigDecimal(.1),瀹冨皢榪斿洖涓涓狟igDecimal,涔熷嵆0.10000000000000000555111512312578270211815834041015625.姝ｇ‘浣跨敤鎴戜滑灝卞彲浠ュ緱鍒版湡鏈涚殑緇撴灉0.90:
code:
import java.math.BigDecimal;
class Change
{
聽(tīng)public static void main(String[] args)
聽(tīng){
聽(tīng)聽(tīng)System.out.println(new BigDecimal("2.00").
聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng)聽(tīng) subtract(new BigDecimal("1.10")));
聽(tīng)}
}
Print:
F:\Java Develop>java Change
0.90
聽(tīng)
]]>