java列出所有系统属性

import java.util.Enumeration;
import java.util.Properties;

public class ListProperties {

public static void main(String[] args) {
   // Get all system properties
      Properties props = System.getProperties();
     
      // Enumerate all system properties
      Enumeration enum1 = props.propertyNames();
      for (; enum1.hasMoreElements(); ) {
          // Get property name
          String propName = (String)enum1.nextElement();
          // Get property value
          String propValue = (String)props.get(propName);
          System.out.println(propName+"-->"+propValue);
      }
}
}