java.versionJava Runtime Environment versionJava API 实现的版本 java.vendorJava Runtime Environment vendorJava API 实现的厂商java.vendor.urlJava vendor URLJava API 规范厂商的URLjava.homeJava installation directoryJava安装目录java.vm.specification.versionJava Virtual Machine specification versionJava API 规范的版本java.vm.specification.vendorJava Virtual Machine specification vendorJava API 规范的厂商 java.vm.specification.nameJava Virtual Machine specification nameJava API 规范的名称java.vm.versionJava Virtual Machine implementation versionJava虚拟机实现的版本java.vm.vendorJava Virtual Machine implementation vendorJava虚拟机实现的厂商java.vm.nameJava Virtual Machine implementation nameJava虚拟机实现的名称java.specification.versionJava Runtime Environment specification versionJava虚拟机规范的版本java.specification.vendorJava Runtime Environment specification vendorJava虚拟机规范的厂商java.specification.nameJava Runtime Environment specification nameJava虚拟机规范的名称java.class.versionJava class format version numberJava类文件格式的版本java.class.pathJava class path装载类的路径 java.library.pathList of paths to search when loading libraries java.io.tmpdirDefault temp file path java.compilerName of JIT compiler to use java.ext.dirsPath of extension directory or directories os.nameOperating system name主机操作系统的名称 os.archOperating system architecture主机操作系统的体系结构os.versionOperating system version主机操作系统的版本 file.separatorFile separator ("/" on UNIX)平台目录的分隔符path.separatorPath separator (":" on UNIX)平台路径的分隔符 line.separatorLine separator ("\n" on UNIX)平台文本行的分隔符user.nameUser's account name当前用户的帐户名称user.homeUser's home directory当前用户的根目录user.dirUser's current working directory当前工作目录
提供一段代码可以打印所有的系统属性：
java.util.Properties pp = System.getProperties(); java.util.Enumeration en = pp.propertyNames(); while (en.hasMoreElements()) { String elm = (String) en.nextElement(); System.out.print(elm + " ---->" + pp.getProperty(elm)); System.out.println(); }
运行结果：
java.runtime.name ---->Java(TM) 2 Runtime Environment, Standard Edition sun.boot.library.path ---->C:\j2sdk1.4.2_13\jre\bin java.vm.version ---->1.4.2_13-b06 java.vm.vendor ---->Sun Microsystems Inc. java.vendor.url ---->http://java.sun.com/ path.separator ---->; java.vm.name ---->Java HotSpot(TM) Client VM file.encoding.pkg ---->sun.io user.country ---->CN sun.os.patch.level ---->Service Pack 2 java.vm.specification.name ---->Java Virtual Machine Specification user.dir ---->D:\oukai java.runtime.version ---->1.4.2_13-b06 java.awt.graphicsenv ---->sun.awt.Win32GraphicsEnvironment java.endorsed.dirs ---->C:\j2sdk1.4.2_13\jre\lib\endorsed os.arch ---->x86 java.io.tmpdir ---->C:\DOCUME~1\xiaoxin\LOCALS~1\Temp\ line.separator ----> java.vm.specification.vendor ---->Sun Microsystems Inc. user.variant ----> os.name ---->Windows XP sun.java2d.fontpath ----> java.library.path ---->C:\j2sdk1.4.2_13\bin;.;C:\WINDOWS\system32;C:\WINDOWS;.;C:\JBuilder2006\bin;C:\JBuilder2006\jdk1.5\bin;C:\Program Files\Java\jdk1.5.0_15\bin;C:\Program Files\IBM\WebSphere MQ\Java\lib;D:\oracle\ora92\bin;C:\Program Files\Oracle\jre\1.3.1\bin;C:\Program Files\Oracle\jre\1.1.8\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\ATI Technologies\ATI.ACE\Core-Static;C:\Program Files\cvsnt;C:\Program Files\IBM\WebSphere MQ\bin;C:\Program Files\IBM\WebSphere MQ\WEMPS\bin;C:\Program Files\Microsoft SQL Server\80\Tools\BINN;C:\Program Files\StormIII\Codec;C:\Program Files\StormIII;C:\JBuilder2006\debug\sa;C:\JBuilder2006\lib java.specification.name ---->Java Platform API Specification java.class.version ---->48.0 java.util.prefs.PreferencesFactory ---->java.util.prefs.WindowsPreferencesFactory os.version ---->5.1 user.home ---->C:\Documents and Settings\xiaoxin user.timezone ----> java.awt.printerjob ---->sun.awt.windows.WPrinterJob file.encoding ---->GBK java.specification.version ---->1.4 user.name ---->xiaoxin java.class.path ---->D:\oukai\classes;C:\j2sdk1.4.2_13\jre\lib\plugin.jar;C:\j2sdk1.4.2_13\jre\lib\im\thaiim.jar;C:\j2sdk1.4.2_13\jre\lib\im\indicim.jar;C:\j2sdk1.4.2_13\jre\lib\charsets.jar;C:\j2sdk1.4.2_13\jre\lib\ext\ldapsec.jar;C:\j2sdk1.4.2_13\jre\lib\ext\dnsns.jar;C:\j2sdk1.4.2_13\jre\lib\ext\sunjce_provider.jar;C:\j2sdk1.4.2_13\jre\lib\ext\localedata.jar;C:\j2sdk1.4.2_13\jre\lib\jsse.jar;C:\j2sdk1.4.2_13\jre\lib\rt.jar;C:\j2sdk1.4.2_13\jre\lib\sunrsasign.jar;C:\j2sdk1.4.2_13\jre\lib\jce.jar;C:\j2sdk1.4.2_13\jre\javaws\javaws.jar;C:\j2sdk1.4.2_13\lib\htmlconverter.jar;C:\j2sdk1.4.2_13\lib\dt.jar;C:\j2sdk1.4.2_13\lib\tools.jar java.vm.specification.version ---->1.0 sun.arch.data.model ---->32 java.home ---->C:\j2sdk1.4.2_13\jre java.specification.vendor ---->Sun Microsystems Inc. user.language ---->zh awt.toolkit ---->sun.awt.windows.WToolkit java.vm.info ---->mixed mode java.version ---->1.4.2_13 java.ext.dirs ---->C:\j2sdk1.4.2_13\jre\lib\ext sun.boot.class.path ---->C:\j2sdk1.4.2_13\jre\lib\rt.jar;C:\j2sdk1.4.2_13\jre\lib\i18n.jar;C:\j2sdk1.4.2_13\jre\lib\sunrsasign.jar;C:\j2sdk1.4.2_13\jre\lib\jsse.jar;C:\j2sdk1.4.2_13\jre\lib\jce.jar;C:\j2sdk1.4.2_13\jre\lib\charsets.jar;C:\j2sdk1.4.2_13\jre\classes java.vendor ---->Sun Microsystems Inc. file.separator ---->\ java.vendor.url.bug ---->http://java.sun.com/cgi-bin/bugreport.cgi sun.cpu.endian ---->little sun.io.unicode.encoding ---->UnicodeLittle sun.cpu.isalist ---->pentium i486 i386
