java Sysem Properties

Code snippet:

public static void main(String[] args) {
	// TODO Auto-generated method stub
		
	Properties pr = System.getProperties();
        TreeSet propKeys = new TreeSet(pr.keySet());  // TreeSet sorts keys
        for (Iterator it = propKeys.iterator(); it.hasNext(); ) {
            	String key = (String)it.next();
            	System.out.println(key + "=" + pr.get(key));
        }
        
        System.out.println(System.getProperty("user.dir")); 
        System.out.println(System.getProperty("user.home")); 
        System.out.println(System.getProperty("user.name")); 
}
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