16.5 System properties

This lesson shows how to handle Java environment variables.

Essence

/* Copyright (c) 2000- System Exclusive & Multi Midi  (SEMM)
All rights reserved.
Author : Paul Hamaker.
Part of javalessons.com 
This code is for educational purposes only.*/
import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class Settings
		extends Applet
		implements ActionListener
{
	Button btn ;
	TextArea ta ;
	
	public void
	actionPerformed ( ActionEvent ev )
	{
		ta.setText ( "" ) ;
		String tx ;
		
		tx = System.getProperty ( "java.version" ) ;   
		
		ta.append ( "java.version\t: " + tx + "\n" ) ;
		
		tx = System.getProperty ( "os.name" ) ;

ta.append ( "os.name\t: " + tx + "\n" ) ;

tx = System.getProperty ( "os.version" ) ;

ta.append ( "os.version\t: " + tx + "\n" ) ;

tx = System.getProperty ( "java.vendor" ) ;

System.out.println ( "In the Java console, java.vendor :" + tx ) ;

showStatus ( "====> Applets only, not for important messages <===" ) ;
	}

public Settings (	)
	{
		btn = new Button ( "Get them" ) ;
		ta = new TextArea ( 5, 40 ) ;
	}

public void init() {
		btn.addActionListener ( this );
		add ( btn ) ;
		add ( ta ) ;
		setBackground ( Color.green );
		validate ();
	}
}
/*==============
 System.setProperty( "somekey", "somevalue" );
 System.getProperties().list( System.out );
 String s = System.getProperty("akey", "UNKNOWN");
*/

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