getprops.java

初级学习资料必读本

import java.lang.*;
import java.security.*;

class GetProps {

    public static void main(String[] args) {

        /* Test reading properties w & w/out security manager */
        
        String s;

        try {

            System.out.println("About to get os.name property value");

            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");

            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");

            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");

            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());
        }

    }

}