Output Java system properties in an easy-to-read format

Java system propertyoutput in alphabetical order. System.getProperties()

Javaindicates certainty, emphasis, etc.system propertyHere is a sample program that outputs keys and values in alphabetical order for easy viewing.
Once stored in the TreeMap, the data is sorted alphabetically before output.

Usually the following method is well presented, but it is very difficult to see because the values are broken in the middle and not alphabetically ordered.

-- listing properties --
java.runtime.name=Java(TM) 2 Runtime Environment, Stand...
sun.boot.library.path=C:\develop\Java\jdk1.5.0_08\jre\bin
java.vm.version=1.5.0_08-b03
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=JP
sun.os.patch.level=Service Pack 2
java.vm.specification.name=Java Virtual Machine Specification
user.dir=C:\apps\0-app
java.runtime.version=1.5.0_08-b03
java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment
java.endorsed.dirs=C:\develop\Java\jdk1.5.0_08\jre\lib\e...
os.arch=x86
java.io.tmpdir=C:\DOCUME~1\***\LOCALS~1\Temp\
line.separator=

java.vm.specification.vendor=Sun Microsystems Inc.
user.variant=
os.name=Windows XP
sun.jnu.encoding=MS932
java.library.path=C:\develop\Java\jdk1.5.0_08\bin;. ;C:\...
java.specification.name=Java Platform API Specification
java.class.version=49.0
sun.management.compiler=HotSpot Client Compiler
os.version=5.1
user.home=C:\Documents and Settings\****
user.timezone=
java.awt.printerjob=sun.awt.windows.WPrinterJob
file.encoding=MS932
java.specification.version=1.5
user.name=****
java.class.path=C:\apps\0-app\bin;C:\apps\0-app\jre1....
java.vm.specification.version=1.0
sun.arch.data.model=32
java.home=C:\develop\Java\jdk1.5.0_08\jre
java.specification.vendor=Sun Microsystems Inc.
user.language=en
awt.toolkit=sun.awt.windows.WToolkit
java.vm.info=mixed mode, sharing
java.version=1.5.0_08
java.ext.dirs=C:\develop\Java\jdk1.5.0_08\jre\lib\ext
sun.boot.class.path=C:\develop\Java\jdk1.5.0_08\jre\lib\r...
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=pentium_pro+mmx pentium_pro pentium+m...

sample program

/**
 * Output system property keys and values in alphabetical order.
 */
public static void outputSystemProperties() {
    Properties p = System.getProperties();
    TreeMap map = new TreeMap();
    map.putAll(p);
    Iterator itr = map.keySet().iterator();
    while (itr.hasNext()) {
        String key = (String)itr.next();
        String value = (String)map.get(key);
        System.out.println(key + "=" + value);
    }
}

Execution Result

◆Example of Execution

public static void main(String[] args) {
    outputSystemProperties(); }
}

◆Output result

awt.toolkit=sun.awt.windows.WToolkit
file.encoding=MS932
file.encoding.pkg=sun.io
file.separator=\\
java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment
java.awt.printerjob=sun.awt.windows.WPrinterJob
java.class.path=C:\apps\0-app\bin;C:\apps\0-app\jre1.6.0\lib\rt.jar;C:\apps\0-app\sys\lib\bcprov-jdk14-123.jar
java.class.version=49.0
java.endorsed.dirs=C:\develop\Java\jdk1.5.0_08\jre\lib\endorsed
java.ext.dirs=C:\develop\Java\jdk1.5.0_08\jre\lib\ext
java.home=C:\develop\Java\jdk1.5.0_08\jre
java.io.tmpdir=C:\DOCUME~1\***\LOCALS~1\Temp\
java.library.path=C:\develop\Java\jdk1.5.0_08\bin;. ;C:\WINDOWS\system32;C:\WINDOWS;C:\develop\Java\jdk1.5.0_08\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\system32\bem;C:\ ProgramFilesDevelop\TOOLS\ant-1.6.1\bin;C:\develop\eclipse32\extensions\tptp-4.2.0\agent-controller\bin;C:\Program Files\QuickTime \QTSystem\\
java.runtime.name=Java(TM) 2 Runtime Environment, Standard Edition
java.runtime.version=1.5.0_08-b03
java.specification.name=Java Platform API Specification
java.specification.vendor=Sun Microsystems Inc.
java.specification.version=1.5
java.vendor=Sun Microsystems Inc.
java.vendor.url=http://java.sun.com/
java.vendor.url.bug=http://java.sun.com/cgi-bin/bugreport.cgi
java.version=1.5.0_08
java.vm.info=mixed mode, sharing
java.vm.name=Java HotSpot(TM) Client VM
java.vm.specification.name=Java Virtual Machine Specification
java.vm.specification.vendor=Sun Microsystems Inc.
java.vm.specification.version=1.0
java.vm.vendor=Sun Microsystems Inc.
java.vm.version=1.5.0_08-b03
line.separator=

os.arch=x86
os.name=Windows XP
os.version=5.1
path.separator=;
sun.arch.data.model=32
sun.boot.class.path=C:\develop\Java\jdk1.5.0_08\jre\lib\rt.jar;C:\develop\Java\jdk1.5.0_08\jre\lib\i18n.jar .0_08\jre\lib\sunrsasign.jar;C:\develop\Java\jdk1.5.0_08\jre\lib\jsse.jar;C:\develop\Java\jdk1.5.0_08\jre\lib\jce.jar Java\jdk1.5.0_08\jre\lib\charsets.jar;C:\develop\Java\jdk1.5.0_08\jre\classes
sun.boot.library.path=C:\develop\Java\jdk1.5.0_08\jre\bin
sun.cpu.endian=little
sun.cpu.isalist=pentium_pro+mmx pentium_pro pentium+mmx pentium i486 i386 i86
sun.desktop=windows
sun.io.unicode.encoding=UnicodeLittle
sun.jnu.encoding=MS932
sun.management.compiler=HotSpot Client Compiler
sun.os.patch.level=Service Pack 2
user.country=JP
user.dir=C:\apps\0-app
user.home=C:\Documents and Settings\***
user.language=en
user.name=***
user.timezone=
user.variant=

I see that all information is listed in alphabetical order.
Especially if all java.class.path, java.library.path, etc. are not shown, it will take a long time to solve the problem.