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System Properties
This example shows how to access system default properties and user defined
properties while starting the appliction in console.
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package com.bethecoder.tutorials.system;
public class SystemPropertiesTest {
public static void main(String[] args) {
//Default properties
System.out.println("OS : " + getOS());
System.out.println("Cur Directory : " + getCurDirectory());
System.out.println("Class Path : " + getClassPath());
System.out.println("Library Path : " + getLibraryPath());
//Get user defined properties passed in command line.
System.out.println("userDef1 : " + System.getProperty("my.prop1"));
System.out.println("userDef2 : " + System.getProperty("my.prop2"));
//Change property
System.setProperty("my.prop1", "SIX");
System.out.println("userDef1 : " + System.getProperty("my.prop1"));
//Clear property
System.clearProperty("my.prop1");
System.out.println("userDef1 : " + System.getProperty("my.prop1"));
//List all properties
System.out.println();
System.getProperties().list(System.out);
}
public static String getOS() {
return System.getProperty("os.name");
}
public static String getCurDirectory() {
return System.getProperty("user.dir");
}
public static String getClassPath() {
return System.getProperty("user.dir");
}
public static String getLibraryPath() {
return System.getProperty("java.library.path");
}
}
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In console we can invoke the application as shown below,
C:\Test>java -Dmy.prop1=ONE -Dmy.prop2=TWO com.bethecoder.tutorials.system.SystemPropertiesTest
It gives the following output,
OS : Windows XP
Cur Directory : C:\Test
Library Path : C:\WINDOWS\system32;.;C:\WINDOWS\Sun\Java\bin;
C:\WINDOWS\system32;C:\WINDOWS;D:\Program Files\wamp\mysql\bin;
userDef1 : ONE
userDef2 : TWO
userDef1 : SIX
userDef1 : null
-- listing properties --
java.runtime.name=Java(TM) SE Runtime Environment
sun.boot.library.path=C:\Program Files\Java\jre1.6.0_02\bin
java.vm.version=1.6.0_02-b05
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:\Test
java.runtime.version=1.6.0_02-b05
java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment
java.endorsed.dirs=C:\Program Files\Java\jre1.6.0_02\lib...
os.arch=x86
java.io.tmpdir=C:\DOCUME~1\sudhakar\LOCALS~1\Temp\
line.separator=
java.vm.specification.vendor=Sun Microsystems Inc.
user.variant=
os.name=Windows XP
sun.jnu.encoding=Cp1252
java.library.path=C:\WINDOWS\system32;.;C:\WINDOWS\Sun\...
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 Settings\sudhakar
user.timezone=
java.awt.printerjob=sun.awt.windows.WPrinterJob
file.encoding=Cp1252
java.specification.version=1.6
user.name=sudhakar
java.class.path=.
java.vm.specification.version=1.0
sun.arch.data.model=32
java.home=C:\Program Files\Java\jre1.6.0_02
java.specification.vendor=Sun Microsystems Inc.
user.language=en
awt.toolkit=sun.awt.windows.WToolkit
java.vm.info=mixed mode
java.version=1.6.0_02
my.prop2=TWO
java.ext.dirs=C:\Program Files\Java\jre1.6.0_02\lib...
sun.boot.class.path=C:\Program Files\Java\jre1.6.0_02\lib...
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=
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