java.lang.System.getProperties()方法實例

java.lang.System.getProperties() 方法確定當前系統屬性。當前設置用於通過getProperty(String)方法使用系統屬性返回一個Properties對象。

如果沒有當前系統屬性的集合，那麼它首先創建並初始化系統屬性的集合。這套系統屬性包括以下鍵的值：

Key

關聯值的說明

java.version

Java Runtime Environment version

java.vendor

Java Runtime Environment vendor

java.vendor.url

Java vendor URL

java.home

Java installation directory

java.vm.specification.version

Java Virtual Machine specification version

java.vm.specification.vendor

Java Virtual Machine specification vendor

java.vm.specification.name

Java Virtual Machine specification name

java.vm.version

Java Virtual Machine implementation version

java.vm.vendor

Java Virtual Machine implementation vendor

java.vm.name

Java Virtual Machine implementation name

java.specification.version

Java Runtime Environment specification version

java.specification.vendor

Java Runtime Environment specification vendor

java.specification.name

Java Runtime Environment specification name

java.class.version

Java class format version number

java.class.path

Java class path

java.library.path

List of paths to search when loading libraries

java.io.tmpdir

Default temp file path

java.compiler

Name of JIT compiler to use

java.ext.dirs

Path of extension directory or directories

os.name

Operating system name

os.arch

Operating system architecture

os.version

Operating system version

file.separator

File separator ("/" on UNIX)

path.separator

Path separator (":" on UNIX)

line.separator

Line separator (" " on UNIX)

user.name

User's account name

user.home

User's home directory

user.dir

User's current working directory

聲明

以下是java.lang.System.getProperties()方法的聲明

public static Properties getProperties()

參數

• NA

返回值

此方法返回系統屬性。

異常

• SecurityException -- 如果安全管理器存在並且其checkPermission方法不允許訪問過程中的環境。

例子

下面的例子顯示java.lang.System.getProperties()方法的使用。

package com.yiibai; import java.lang.*; public class SystemDemo { public static void main(String[] args) { // this will list the current system properties Properties p = System.getProperties(); p.list(System.out); } }

讓我們來編譯和運行上面的程序，這將產生以下結果：

-- listing properties -- java.runtime.name=Java(TM) SE Runtime Environment sun.boot.library.path=C:Program FilesJavajdk1.6.0_06jre... java.vm.version=10.0-b22
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=US
sun.java.launcher=SUN_STANDARD
sun.os.patch.level=Service Pack 2 java.vm.specification.name=Java Virtual Machine Specification user.dir=C:Program FilesJavajdk1.6.0_06in java.runtime.version=1.6.0_06-b02
java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment java.endorsed.dirs=C:Program FilesJavajdk1.6.0_06jre... os.arch=x86
java.io.tmpdir=C:DOCUME1AMIT1.AMILOCALS~1Temp
line.separator= java.vm.specification.vendor=Sun Microsystems Inc. user.variant= os.name=Windows XP
sun.jnu.encoding=Cp1252 java.library.path=C:Program FilesJavajdk1.6.0_06in... java.specification.name=Java Platform API Specification java.class.version=50.0 sun.management.compiler=HotSpot Client Compiler os.version=5.1 user.home=C:Documents and Settingsamit.AMIT-4... user.timezone= java.awt.printerjob=sun.awt.windows.WPrinterJob file.encoding=Cp1252 java.specification.version=1.6 user.name=amit
java.class.path=. java.vm.specification.version=1.0 sun.arch.data.model=32 java.home=C:Program FilesJavajdk1.6.0_06jre
java.specification.vendor=Sun Microsystems Inc. user.language=en
awt.toolkit=sun.awt.windows.WToolkit java.vm.info=mixed mode, sharing
java.version=1.6.0_06 java.ext.dirs=C:Program FilesJavajdk1.6.0_06jre... sun.boot.class.path=C:Program FilesJavajdk1.6.0_06jre... java.vendor=Sun Microsystems Inc. file.separator= java.vendor.url.bug=http://java.sun.com/cgi-bin/bugreport... sun.cpu.endian=little
sun.io.unicode.encoding=UnicodeLittle sun.desktop=windows
sun.cpu.isalist=