import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Enumeration;
import java.util.Properties;
import java.util.Set;

public class SystemPropertes {

	public static void main(String[] args) throws SocketException, UnknownHostException {
		System.out.println("当前使用的JDK安装目录:" + System.getenv("JAVA_HOME"));
		System.out.println("当前系统属性");
		getSystemProperties();//可以利用这些key获取系统信息
		Runtime r = Runtime.getRuntime();
		System.out.println("");
		System.out.print("CPU信息   数量：" + r.availableProcessors() + "\n");
		System.out.println("内存："+r.totalMemory() + " bytes");
		System.out.println("当前系统登录的用户名:" + System.getProperty("user.name"));
		System.out.println("结束当前运行的jvm,运行System.exit(0)");
		System.exit(0);
		
	}

	/**
	 * 获取系统属性
	 */
	public static void getSystemProperties() {
		Properties properties = System.getProperties();
		Set<Object> keySet = properties.keySet();
		for (Object key : keySet) {
			System.out.println(key + "------" + properties.get(key));
		}
	}
}