锘?!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> Java 瀛楃緇堢涓婅幏鍙栬緭鍏ヤ笁縐嶆柟寮?嫻庡崡杞歡寮�鍙憒灞變笢杞歡寮�鍙?嫻庡崡璧㈠痙縐戞妧杞歡寮�鍙戝叕鍙?/title> <meta name="keywords" content="Java 瀛楃緇堢涓婅幏鍙栬緭鍏ヤ笁縐嶆柟寮?/> <meta name="description" content="灞變笢杞歡寮�鍙戝湪Java瀛楃緇堢涓婅幏鍙栬緭鍏ユ湁涓夌鏂瑰紡錛?銆乯ava.lang.System.in(鐩墠JDK鐗堟湰鍧囨敮鎸?2銆乯ava.util.Scanner(JDK鐗堟湰>=1.5)3銆乯ava.io.Console(JDK鐗堟湰>=1.6)錛岀壒鑹詫細鑳戒笉鍥炴樉瀵嗙爜瀛楃鍙傝�冿細榪欓噷璁板綍Java涓粠鎺у埗"/> <link href="/css/style.css" rel="stylesheet" type="text/css" /> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> </head> <body> <div style="position:fixed;left:-9000px;top:-9000px;"><dfn id="orz4q"><noscript id="orz4q"><xmp id="orz4q"><output id="orz4q"></output></xmp></noscript></dfn><strong id="orz4q"><dl id="orz4q"></dl></strong><ol id="orz4q"><p id="orz4q"><nav id="orz4q"><pre id="orz4q"></pre></nav></p></ol><dfn id="orz4q"></dfn><small id="orz4q"><optgroup 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class="youshi_f1" id="youshi_tdyx"> <div class="youshi01"> <h1 class="article_title">Java 瀛楃緇堢涓婅幏鍙栬緭鍏ヤ笁縐嶆柟寮?/h1> <div class="article_author">娣誨姞鏃墮棿錛?016-9-27 15:44:16 鏂囩珷浣滆�咃細<a href="/">嫻庡崡杞歡寮�鍙?/a> 嫻忚嬈℃暟錛?Script Language="Javascript" Src="/item/GetHits.asp?Action=Count&GetFlag=0&m=1&ID=2799"></Script></div> <div class="article_main"><div id="MyContent"><p><span style="font-size: 14px;">銆�銆�<a href="/" target="_self"><strong>灞變笢杞歡寮�鍙?/strong></a>鍦↗ava 瀛楃緇堢涓婅幏鍙栬緭鍏ユ湁涓夌鏂瑰紡錛?/span></p><p><span style="font-size: 14px;">銆�銆�1銆乯ava.lang.System.in (鐩墠JDK鐗堟湰鍧囨敮鎸?</span></p><p><span style="font-size: 14px;">銆�銆�2銆乯ava.util.Scanner (JDK鐗堟湰>=1.5)</span></p><p><span style="font-size: 14px;">銆�銆�3銆乯ava.io.Console(JDK鐗堟湰>=1.6)錛岀壒鑹詫細鑳戒笉鍥炴樉瀵嗙爜瀛楃</span></p><p><span style="font-size: 14px;">銆�銆�鍙傝�冿細</span></p><p><span style="font-size: 14px;">銆�銆�榪欓噷璁板綍Java涓粠鎺у埗鍙拌鍏ヤ俊鎭殑鍑犵鏂瑰紡</span></p><p><span style="font-size: 14px;">銆�銆�(1)JDK 1.4(JDK 1.5鍜孞DK 1.6涔熼兘鍏煎榪欑鏂規硶)</span></p><p><span style="font-size: 14px;">銆�銆�public class TestConsole1 {</span></p><p><span style="font-size: 14px;">銆�銆�public static void main(String[] args) {</span></p><p><span style="font-size: 14px;">銆�銆�String str = readDataFromConsole("Please input string錛?;</span></p><p><span style="font-size: 14px;">銆�銆�System.out.println("The information from console錛?+ str);</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�/**</span></p><p><span style="font-size: 14px;">銆�銆�* Use InputStreamReader and System.in to read data from console</span></p><p><span style="font-size: 14px;">銆�銆�*</span></p><p><span style="font-size: 14px;">銆�銆�* @param prompt</span></p><p><span style="font-size: 14px;">銆�銆�*</span></p><p><span style="font-size: 14px;">銆�銆�* @return input string</span></p><p><span style="font-size: 14px;">銆�銆�*/</span></p><p><span style="font-size: 14px;">銆�銆�private static String readDataFromConsole(String prompt) {</span></p><p><span style="font-size: 14px;">銆�銆�BufferedReader br = new BufferedReader(new InputStreamReader(System.in));</span></p><p><span style="font-size: 14px;">銆�銆�String str = null;</span></p><p><span style="font-size: 14px;">銆�銆�try {</span></p><p><span style="font-size: 14px;">銆�銆�System.out.print(prompt);</span></p><p><span style="font-size: 14px;">銆�銆�str = br.readLine();</span></p><p><span style="font-size: 14px;">銆�銆�} catch (IOException e) {</span></p><p><span style="font-size: 14px;">銆�銆�e.printStackTrace();</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�return str;</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�(2)JDK 1.5錛堝埄鐢⊿canner榪涜璇誨彇錛?/span></p><p><span style="font-size: 14px;">銆�銆�public class TestConsole2 {</span></p><p><span style="font-size: 14px;">銆�銆�public static void main(String[] args) {</span></p><p><span style="font-size: 14px;">銆�銆�String str = readDataFromConsole("Please input string:");</span></p><p><span style="font-size: 14px;">銆�銆�System.out.println("The information from console:" + str);</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�/**</span></p><p><span style="font-size: 14px;">銆�銆�* Use  java.util.Scanner to read data from console</span></p><p><span style="font-size: 14px;">銆�銆�*</span></p><p><span style="font-size: 14px;">銆�銆�* @param prompt</span></p><p><span style="font-size: 14px;">銆�銆�*</span></p><p><span style="font-size: 14px;">銆�銆�* @return input string</span></p><p><span style="font-size: 14px;">銆�銆�*/</span></p><p><span style="font-size: 14px;">銆�銆�private static String readDataFromConsole(String prompt) {</span></p><p><span style="font-size: 14px;">銆�銆�Scanner scanner = new Scanner(System.in);</span></p><p><span style="font-size: 14px;">銆�銆�System.out.print(prompt);</span></p><p><span style="font-size: 14px;">銆�銆�return scanner.nextLine();</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�Scanner榪樺彲浠ュ緢鏂逛究鐨勬壂鎻忔枃浠訛紝璇誨彇閲岄潰鐨勪俊鎭茍杞崲鎴愪綘瑕佺殑綾誨瀷錛屾瘮濡傚鈥? 2.2 3.3 3.33 4.5 done鈥濊繖鏍風殑鏁版嵁姹傚拰,瑙佸涓嬩唬鐮?</span></p><p><span style="font-size: 14px;">銆�銆�public class TestConsole4 {</span></p><p><span style="font-size: 14px;">銆�銆�public static void main(String[] args) throws IOException {</span></p><p><span style="font-size: 14px;">銆�銆�FileWriter fw = new FileWriter("num.txt");</span></p><p><span style="font-size: 14px;">銆�銆�fw.write("2 2.2 3.3 3.33 4.5 done");</span></p><p><span style="font-size: 14px;">銆�銆�fw.close();</span></p><p><span style="font-size: 14px;">銆�銆�System.out.println("Sum is "+scanFileForSum("num.txt"));</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�public static double scanFileForSum(String fileName) throws IOException {</span></p><p><span style="font-size: 14px;">銆�銆�double sum = 0.0;</span></p><p><span style="font-size: 14px;">銆�銆�FileReader fr = null;</span></p><p><span style="font-size: 14px;">銆�銆�try {</span></p><p><span style="font-size: 14px;">銆�銆�fr = new FileReader(fileName);</span></p><p><span style="font-size: 14px;">銆�銆�Scanner scanner = new Scanner(fr);</span></p><p><span style="font-size: 14px;">銆�銆�while (scanner.hasNext()) {</span></p><p><span style="font-size: 14px;">銆�銆�if (scanner.hasNextDouble()) {</span></p><p><span style="font-size: 14px;">銆�銆�sum = sum + scanner.nextDouble();</span></p><p><span style="font-size: 14px;">銆�銆�} else {</span></p><p><span style="font-size: 14px;">銆�銆�String str = scanner.next();</span></p><p><span style="font-size: 14px;">銆�銆�if (str.equals("done")) {</span></p><p><span style="font-size: 14px;">銆�銆�break;</span></p><p><span style="font-size: 14px;">銆�銆�} else {</span></p><p><span style="font-size: 14px;">銆�銆�throw new RuntimeException("File Format is wrong!");</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�} catch (FileNotFoundException e) {</span></p><p><span style="font-size: 14px;">銆�銆�throw new RuntimeException("File " + fileName + " not found!");</span></p><p><span style="font-size: 14px;">銆�銆�} finally {</span></p><p><span style="font-size: 14px;">銆�銆�if (fr != null)</span></p><p><span style="font-size: 14px;">銆�銆�fr.close();</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�return sum;</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�(3)JDK 1.6錛堝埄鐢╦ava.io.Console榪涜璇誨彇錛?/span></p><p><span style="font-size: 14px;">銆�銆�JDK6涓彁渚涗簡java.io.Console綾諱笓鐢ㄦ潵璁塊棶鍩轟簬瀛楃鐨勬帶鍒跺彴璁懼.</span></p><p><span style="font-size: 14px;">銆�銆�浣犵殑紼嬪簭濡傛灉瑕佷笌Windows涓嬬殑cmd鎴栬�匧inux涓嬬殑Terminal浜や簰,灝卞彲浠ョ敤Console綾諱唬鍔?錛堢被浼糞ystem.in鍜孲ystem.out錛?/span></p><p><span style="font-size: 14px;">銆�銆�浣嗘垜浠笉鎬繪槸鑳藉緱鍒板彲鐢ㄧ殑Console, 涓�涓狫VM鏄惁鏈夊彲鐢ㄧ殑Console渚濊禆浜庡簳灞傚鉤鍙板拰JVM濡備綍琚皟鐢?</span></p><p><span style="font-size: 14px;">銆�銆�濡傛灉JVM鏄湪浜や簰寮忓懡浠よ(姣斿Windows鐨刢md)涓惎鍔ㄧ殑,騫朵笖杈撳叆杈撳嚭娌℃湁閲嶅畾鍚戝埌鍙﹀鐨勫湴鏂?閭ｄ箞灝卞彲浠ュ緱鍒頒竴涓彲鐢ㄧ殑Console瀹炰緥銆?/span></p><p><span style="font-size: 14px;">銆�銆�鍦ㄤ嬌鐢?IDE 鐨勬儏鍐典笅錛屾槸鏃犳硶鑾峰彇鍒癈onsole瀹炰緥鐨勶紝鍘熷洜鍦ㄤ簬鍦?IDE 鐨勭幆澧冧笅錛岄噸鏂板畾鍚戜簡鏍囧噯杈撳叆鍜岃緭鍑烘祦錛屼篃鏄氨鏄皢緋葷粺鎺у埗鍙頒笂鐨勮緭鍏ヨ緭鍑洪噸瀹氬悜鍒頒簡 IDE 鐨勬帶鍒跺彴涓?/span></p><p><span style="font-size: 14px;">銆�銆�public class TestConsole3 {</span></p><p><span style="font-size: 14px;">銆�銆�public static void main(String[] args) {</span></p><p><span style="font-size: 14px;">銆�銆�String str = readDataFromConsole("Please input string:");</span></p><p><span style="font-size: 14px;">銆�銆�System.out.println("The information from console:" + str);</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�/**</span></p><p><span style="font-size: 14px;">銆�銆�* Use  java.io.console to read data from console</span></p><p><span style="font-size: 14px;">銆�銆�*</span></p><p><span style="font-size: 14px;">銆�銆�* @param prompt</span></p><p><span style="font-size: 14px;">銆�銆�*</span></p><p><span style="font-size: 14px;">銆�銆�* @return input string</span></p><p><span style="font-size: 14px;">銆�銆�*/</span></p><p><span style="font-size: 14px;">銆�銆�private static String readDataFromConsole(String prompt) {</span></p><p><span style="font-size: 14px;">銆�銆�Console console = System.console();</span></p><p><span style="font-size: 14px;">銆�銆�if (console == null) {</span></p><p><span style="font-size: 14px;">銆�銆�throw new IllegalStateException("Console is not available!");</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�return console.readLine(prompt);</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�Console綾昏繕鏈変釜鐗硅壊灝辨槸錛屼笓闂ㄥ瀵嗙爜(杈撳叆鏃犲洖鏄?絳夊畨鍏ㄥ瓧絎︼紝榪涜浜嗗鐞嗐�備笓闂ㄦ彁渚?readPassword()鏂規硶,鍏蜂綋搴旂敤瑙佸涓嬩唬鐮侊細</span></p><p><span style="font-size: 14px;">銆�銆�public class TestConsole5 {</span></p><p><span style="font-size: 14px;">銆�銆�public static void main(String[] args) {</span></p><p><span style="font-size: 14px;">銆�銆�Console console = System.console();</span></p><p><span style="font-size: 14px;">銆�銆�if (console == null) {</span></p><p><span style="font-size: 14px;">銆�銆�throw new IllegalStateException("Console is not available!");</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�while(true){</span></p><p><span style="font-size: 14px;">銆�銆�String username = console.readLine("Username: ");</span></p><p><span style="font-size: 14px;">銆�銆�char[] password = console.readPassword("Password: ");</span></p><p><span style="font-size: 14px;">銆�銆�if (username.equals("Chris") && String.valueOf(password).equals("GoHead")) {</span></p><p><span style="font-size: 14px;">銆�銆�console.printf("Welcome to Java Application %1$s.\n", username);</span></p><p><span style="font-size: 14px;">銆�銆�// 浣跨敤鍚庡簲绔嬪嵆灝嗘暟緇勬竻絀猴紝浠ュ噺灝戝叾鍦ㄥ唴瀛樹腑鍗犵敤鐨勬椂闂達紝澧炲己瀹夊叏鎬?/span></p><p><span style="font-size: 14px;">銆�銆�password = null;</span></p><p><span style="font-size: 14px;">銆�銆�System.exit(-1);</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�else {</span></p><p><span style="font-size: 14px;">銆�銆�console.printf("Invalid username or password.\n");</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><span style="font-size: 14px;">銆�銆�}</span></p><p><br/></p></div> </div> </div> </div> <div class="clear"></div> <div class="foot"> <div class="foot_menu"> <ul> <li><a href="/About/">鍏充簬鎴戜滑</a></li> <li><a href="/Advantage/">寮�鍙戜紭鍔?/a></li> <li><a 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