[자바열거자 Enumeration을 개선된 for문으로 변경하기]

[자바열거자 Enumeration을 개선된 for문으로 변경하기] 아래에서 주석처리한 부분이 과거 Enumeration을 이용하여 컬렉션에서 자료를 순회, 탐색하는 방법이며 이를 개선된 for문으로 변경 하였으니 참고하세요. package java1; import java.util.Enumeration; import java.util.Map; import java.util.Properties; class ClassTest { public static void main(String[] args) { Properties prop = System.getProperties(); // Enumeration enum1 = prop.keys(); for (Map.Entry<Object, Object> entry : prop.entrySet()) { System.out.println("key : " + entry.getKey() + "-" + entry.getValue()); // while (enum1.hasMoreElements()) { // String key = (String) enum1.nextElement(); // String val = (String) prop.get(key); // System.out.println("KEY:" + key + ",Value:" + val); // } } } } [결과] key : java.runtime.name-Java(TM) SE Runtime Environment key : sun.boot.library.path-C:\Program Files\Java\jre7\bin key : java.vm.version-23.25-b01 key : java.vm.vendor-Oracle Corporation key : java.vendor.url-http://java.oracle.com/ key : path.separator-; key : java.vm.name-Java HotSpot(TM) Client VM key : file.encoding.pkg-sun.io key : user.country-KR key : user.script- key : sun.java.launcher-SUN_STANDARD key : sun.os.patch.level-Service Pack 3 key : java.vm.specification.name-Java Virtual Machine Specification key : user.dir-C:\java3\project\java1 key : java.runtime.version-1.7.0_25-b16 key : java.awt.graphicsenv-sun.awt.Win32GraphicsEnvironment key : java.endorsed.dirs-C:\Program Files\Java\jre7\lib\endorsed key : os.arch-x86 key : java.io.tmpdir-C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\ key : line.separator- key : java.vm.specification.vendor-Oracle Corporation key : user.variant- key : os.name-Windows XP key : sun.jnu.encoding-MS949 key : java.library.path-C:\Program Files\Java\jre7\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/Java/jre7/bin/client;C:/Program Files/Java/jre7/bin;C:/Program Files/Java/jre7/lib/i386;D:\app\Administrator\product\11.2.0\client_1;D:\app\Administrator\product\11.2.0\client_1\bin;c:\app\Administrator\product\11.2.0\dbhome_5\bin;c:\app\Administrator\product\11.2.0\dbhome_3\bin;c:\app\Administrator\product\11.2.0\dbhome_1\bin;C:\oraclexe\app\oracle\product\11.2.0\server\bin;;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\Java\jdk1.7.0_25\bin;C:\Program Files\Microsoft SQL Server\100\Tools\Binn\;C:\Program Files\Microsoft SQL Server\100\DTS\Binn\;C:\java3\eclipse;;. key : java.specification.name-Java Platform API Specification key : java.class.version-51.0 key : sun.management.compiler-HotSpot Client Compiler key : os.version-5.1 key : user.home-C:\Documents and Settings\Administrator key : user.timezone- key : java.awt.printerjob-sun.awt.windows.WPrinterJob key : file.encoding-MS949 key : java.specification.version-1.7 key : java.class.path-C:\java3\project\java1\bin key : user.name-Administrator key : java.vm.specification.version-1.7 key : sun.java.command-java1.ClassTest 101 102 103 101 key : java.home-C:\Program Files\Java\jre7 key : sun.arch.data.model-32 key : user.language-ko key : java.specification.vendor-Oracle Corporation key : awt.toolkit-sun.awt.windows.WToolkit key : java.vm.info-mixed mode, sharing key : java.version-1.7.0_25 key : java.ext.dirs-C:\Program Files\Java\jre7\lib\ext;C:\WINDOWS\Sun\Java\lib\ext key : sun.boot.class.path-C:\Program Files\Java\jre7\lib\resources.jar;C:\Program Files\Java\jre7\lib\rt.jar;C:\Program Files\Java\jre7\lib\sunrsasign.jar;C:\Program Files\Java\jre7\lib\jsse.jar;C:\Program Files\Java\jre7\lib\jce.jar;C:\Program Files\Java\jre7\lib\charsets.jar;C:\Program Files\Java\jre7\lib\jfr.jar;C:\Program Files\Java\jre7\classes key : java.vendor-Oracle Corporation key : file.separator-\ key : java.vendor.url.bug-http://bugreport.sun.com/bugreport/ key : sun.io.unicode.encoding-UnicodeLittle key : sun.cpu.endian-little key : sun.desktop-windows key : sun.cpu.isalist-pentium_pro+mmx pentium_pro pentium+mmx pentium i486 i386 i86