Java 2 Runtime Environment

今天有人问我Java  Runtime 的一些属性，就索性敲了几行代码。

import java.util.*;

public class GetSysProperty {

    public static void main(String[] args) {
        int s = System.getProperties().size();
        System.out.println("System Properties Number: " + s + "/r/n");
        Enumeration e = System.getProperties().keys();
        Collection v = System.getProperties().values();
        for (Iterator iter = v.iterator(); iter.hasNext(); e.hasMoreElements()) {
            System.out.println(prtSpace(e.nextElement().toString()) + " = "
                    + iter.next());
        }
    }

    public static String prtSpace(String s) {
        int LENGTH = 40;
        int nLen = s.length();
        int sLen = LENGTH - nLen;
        if (sLen > 0) {
            for (int i = 0; i < sLen; i++) {
                s += " ";
            }
        }
        return s;
    }
}

一个运行实例：

System Properties Number: 50

java.runtime.name                        = Java(TM) 2 Runtime Environment, Standard Edition
sun.boot.library.path                    = C:/Program Files/Java/j2re1.4.2/bin
java.vm.version                          = 1.4.2-b28
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 4
java.vm.specification.name               = Java Virtual Machine Specification
user.dir                                 = D:/eww/test
java.runtime.version                     = 1.4.2-b28
java.awt.graphicsenv                     = sun.awt.Win32GraphicsEnvironment
java.endorsed.dirs                       = C:/Program Files/Java/j2re1.4.2/lib/endorsed
os.arch                                  = x86
java.io.tmpdir                           = C:/DOCUME~1/ADMINI~1/LOCALS~1/Temp/
line.separator                           = 

java.vm.specification.vendor             = Sun Microsystems Inc.
user.variant                             = 
os.name                                  = Windows 2000
sun.java2d.fontpath                      = 
java.library.path                        = C:/Program Files/Java/j2re1.4.2/bin;.;C:/WINNT/system32;C:/WINNT;c:/oracle/ora90/bin;C:/Program Files/Oracle/jre/1.1.8/bin;C:/WINNT/system32;C:/WINNT;C:/WINNT/System32/Wbem;D:/j2sdk1.4.2/bin;D:/UnxUtils/usr/local/wbin;C:/PROGRA~1/TCL/bin
java.specification.name                  = Java Platform API Specification
java.class.version                       = 48.0
java.util.prefs.PreferencesFactory       = java.util.prefs.WindowsPreferencesFactory
os.version                               = 5.0
user.home                                = C:/Documents and Settings/Administrator
user.timezone                            = 
java.awt.printerjob                      = sun.awt.windows.WPrinterJob
file.encoding                            = GBK
java.specification.version               = 1.4
java.class.path                          = D:/eww/test/bin;D:/lib/ABS.jar;D:/lib/activation.jar;D:/lib/axis.jar;D:/lib/axis-ant.jar;D:/lib/commons-beanutils.jar;D:/lib/commons-codec-1.1.jar;D:/lib/commons-collections.jar;D:/lib/commons-dbcp.jar;D:/lib/commons-digester.jar;D:/lib/commons-discovery.jar;D:/lib/commons-fileupload.jar;D:/lib/commons-lang.jar;D:/lib/commons-lang-2.0.jar;D:/lib/commons-logging.jar;D:/lib/commons-pool.jar;D:/lib/commons-resources.jar;D:/lib/commons-validator.jar;D:/lib/cos.jar;D:/lib/dfbeans.jar;D:/lib/dfmerp.jar;D:/lib/jakarta-oro.jar;D:/lib/jakarta-oro-2.0.6.jar;D:/lib/jakarta-poi-1.9.0-dev-20030109.jar;D:/lib/jaxrpc.jar;D:/lib/jcms_sysinfo.jar;D:/lib/jconn2.jar;D:/lib/jdom.jar;D:/lib/ldapMd5.jar;D:/lib/LDAPpart.jar;D:/lib/log4j-1.2.8.jar;D:/lib/lucene_cn.jar;D:/lib/lucene-demos-20030724.jar;D:/lib/mail.jar;D:/lib/msbase.jar;D:/lib/mssqlserver.jar;D:/lib/msutil.jar;D:/lib/news_filter.jar;D:/lib/nls_charset12.jar;D:/lib/nntp.jar;D:/lib/OaBasicClass.jar;D:/lib/oracle12.jar;D:/lib/platform.jar;D:/lib/saaj.jar;D:/lib/servlet.jar;D:/lib/sprinta2000_enterprise.jar;D:/lib/velocity-dep-1.4.jar;D:/lib/workflow.jar;D:/lib/workflowserver.jar;D:/lib/wsdl4j.jar;D:/lib/allmodal.jar;D:/lib/jcms_luc.jar;D:/lib/junit.jar;D:/lib/jrlib.jar;D:/lib/mysql-connector-java-3.1.4-beta-bin.jar
user.name                                = Administrator
java.vm.specification.version            = 1.0
java.home                                = C:/Program Files/Java/j2re1.4.2
sun.arch.data.model                      = 32
user.language                            = zh
java.specification.vendor                = Sun Microsystems Inc.
awt.toolkit                              = sun.awt.windows.WToolkit
java.vm.info                             = mixed mode
java.version                             = 1.4.2
java.ext.dirs                            = C:/Program Files/Java/j2re1.4.2/lib/ext
sun.boot.class.path                      = C:/Program Files/Java/j2re1.4.2/lib/rt.jar;C:/Program Files/Java/j2re1.4.2/lib/i18n.jar;C:/Program Files/Java/j2re1.4.2/lib/sunrsasign.jar;C:/Program Files/Java/j2re1.4.2/lib/jsse.jar;C:/Program Files/Java/j2re1.4.2/lib/jce.jar;C:/Program Files/Java/j2re1.4.2/lib/charsets.jar;C:/Program Files/Java/j2re1.4.2/classes
java.vendor                              = Sun Microsystems Inc.
file.separator                           = /
java.vendor.url.bug                      = http://java.sun.com/cgi-bin/bugreport.cgi
sun.io.unicode.encoding                  = UnicodeLittle
sun.cpu.endian                           = little
sun.cpu.isalist                          = pentium i486 i386

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