JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: How to get process environment variables in java at runtime?


Description:

The ProcessBuilder.environment() method returns you the ProcessBuilder's environemnt. Below example shows how to read it.


Code:
package com.java2novice.processbuilder;

import java.util.Map;
import java.util.Set;

public class MyEnvDetails {

	public static void main(String a[]){
		
		ProcessBuilder pb = new ProcessBuilder();
		Map<String, String> envMap = pb.environment();
		Set<String> keys = envMap.keySet();
		for(String key:keys){
			System.out.println(key+" ==> "+envMap.get(key));
		}
	}
}

Output:
SHELL ==> /bin/bash
JAVA_MAIN_CLASS_37131 ==> com.java2novice.processbuilder.MyEnvDetails
APP_ICON_385 ==> ../Resources/Eclipse.icns
com.apple.java.jvmMode ==> client
TMPDIR ==> /var/folders/2n/yf7x2fdx3bv6g31hn4stv1y0_qsrzm/T/
__CF_USER_TEXT_ENCODING ==> 0x157CE3F4:0:0
PATH ==> /usr/bin:/bin:/usr/sbin:/sbin
COMMAND_MODE ==> unix2003
DISPLAY ==> /tmp/launch-DwnV41/org.x:0
USER ==> root
com.apple.java.jvmTask ==> JNI.java
JAVA_STARTED_ON_FIRST_THREAD_385 ==> 1
Apple_Ubiquity_Message ==> /tmp/launch-u3pr6e/Apple_Ubiquity_Message
LOGNAME ==> root
Apple_PubSub_Socket_Render ==> /tmp/launch-nboOhX/Render
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List Of All ProcessBuilder Class Sample Programs:

  1. How to invoke other applicatons in java?
  2. How to run operating system specific command and read its output?
  3. How to get process environment variables in java at runtime?
  4. How to run ProcessBuilder with list of commands?
Knowledge Centre
Stream and types of Streams
A Stream is an abstraction that either produces or consumes information. There are two types of Streams and they are:

Byte Streams: Provide a convenient means for handling input and output of bytes. Byte Streams classes are defined by using two abstract classes, namely InputStream and OutputStream.

Character Streams: Provide a convenient means for handling input & output of characters. Character Streams classes are defined by using two abstract classes, namely Reader and Writer.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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