📄 systemdemo.java
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package com.nine.java;
import java.util.Enumeration;
import java.util.Properties;
public class SystemDemo {
public static void main(String[] args) {
Properties sp = System.getProperties();
Enumeration e = sp.propertyNames();
while (e.hasMoreElements()) {
String key = (String) e.nextElement();
System.out.println(key + " = " + sp.getProperty(key));
}
}
}
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