import java.util.Enumeration;
import java.util.Properties;
public class Main {
public static void main(String[] argv) throws Exception {
Properties props = System.getProperties();
Enumeration e = props.propertyNames();
for (; e.hasMoreElements();) {
String propName = (String) e.nextElement();
System.out.println(propName );
String propValue = (String) props.get(propName);
System.out.println(propValue);
}
}
}
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