JAVA每日一题16

duyiwuer

    题目：用JAVA做一个控制访问权限的例子。
   
package test;import java.lang.*;import java.security.*;class GetProps{public static void main(String[] args){String s;try{System.out.println("About to get os.name property value");//获得系统名称s = System.getProperty("os.name", "not specified");System.out.println("The name of your operating system is: "+s);System.out.println("About to get java.version property value");//获得JVM版本s = System.getProperty("java.version", "not specified");System.out.println("  The version of the JVM you are running is: " + s);System.out.println("About to get user.home property value");//获得用户缺省路径s = System.getProperty("user.home", "not specified");System.out.println("Your user home directory is: " + s);System.out.println("About to get java.home property value");//获得JVM缺省路径s = System.getProperty("java.home", "not specified");System.out.println("Your JRE installation directory is: "+s);}catch (Exception e){System.err.println("Caught exception " + e.toString());}}}