Difference between System.getenv() & System.getProperty() [duplicate]

Question

Possible Duplicate:
What’s the difference between a System property and environment variable

What is the difference between System.getenv() & System.getProperty()?

When we run any command using Processbuilder, we can set the environment variables ie:

String[] vCmd = { System.getenv("ANT_HOME") + "/bin/ant", "-f",                 ANT_BUILD_FILE, TARGET };         ProcessBuilder pb = new ProcessBuilder(vCmd);         Map<String, String> env = pb.environment();              env.put("CLASSPATH",                 antHome+"/lib/ant.jar:"                         + antHome+"/lib/ant-launcher.jar:"                         + antHome+"/lib/ant-nodeps.jar:"                         );         try{              Process process = pb.start();             InputStream is = process.getInputStream();             InputStreamReader isr = new InputStreamReader(is);             BufferedReader br = new BufferedReader(isr);             String line;             while ((line = br.readLine()) != null) {                 System.out.println(line);             }             pb.wait();         }         catch(Exception e)              System.out.println(e.getMessage());           } 

If I set some properties using System.setProperties() before this method , is it available to this process started by ProcessBuilder?

Answer 1

System.getenv gets an environment variable. System.getProperty gets a Java property. Environment variables are specified at the OS level. Java properties are specified by passing the -D option to the JVM (and can be set programmatically).