package dustin.examples.properties; import java.util.Enumeration; import java.util.Properties; import java.util.Set; /** * Lists all Java system properties. Uses * Properties.stringPropertyNames for convenience, * but this is a Java SE 6 feature and it shows only * properties in which both the key and the value * are String types. */ public class JavaSystemPropertiesExample { public static void main(final String[] aArgs) { System.out.println( "Welcome! Here are your Java System properties:"); Properties systemProperties = System.getProperties(); Set<string> propertyNames = systemProperties.stringPropertyNames(); for ( final String propertyName : propertyNames ) { String propertyValue = systemProperties.getProperty(propertyName); if ( propertyValue.isEmpty() ) { propertyValue = "<<<empty string>>>"; } System.out.println( propertyName + " = " + propertyValue ); } } }