JavaでSystem.getProperties()でシステムパラメータを取得する

     Properties props=System.getProperties(); //         System.getProperty("propertyName");
     System.out.println("Java       ："+props.getProperty("java.version"));
     System.out.println("Java        ："+props.getProperty("java.vendor"));
     System.out.println("Java    URL："+props.getProperty("java.vendor.url"));
     System.out.println("Java     ："+props.getProperty("java.home"));
     System.out.println("Java        ："+props.getProperty("java.vm.specification.version"));
     System.out.println("Java         ："+props.getProperty("java.vm.specification.vendor"));
     System.out.println("Java        ："+props.getProperty("java.vm.specification.name"));
     System.out.println("Java        ："+props.getProperty("java.vm.version"));
     System.out.println("Java         ："+props.getProperty("java.vm.vendor"));
     System.out.println("Java        ："+props.getProperty("java.vm.name"));
     System.out.println("Java         ："+props.getProperty("java.specification.version"));
     System.out.println("Java          ："+props.getProperty("java.specification.vender"));
     System.out.println("Java         ："+props.getProperty("java.specification.name"));
     System.out.println("Java       ："+props.getProperty("java.class.version"));
     System.out.println("Java    ："+props.getProperty("java.class.path"));
     System.out.println("           ："+props.getProperty("java.library.path"));
     System.out.println("         ："+props.getProperty("java.io.tmpdir"));
     System.out.println("            ："+props.getProperty("java.ext.dirs"));
     System.out.println("       ："+props.getProperty("os.name"));
     System.out.println("       ："+props.getProperty("os.arch"));
     System.out.println("       ："+props.getProperty("os.version"));
     System.out.println("     ："+props.getProperty("file.separator"));//  unix     "/"
     System.out.println("     ："+props.getProperty("path.separator"));//  unix     ":"
     System.out.println("    ："+props.getProperty("line.separator"));//  unix     "/n"
     System.out.println("       ："+props.getProperty("user.name"));
     System.out.println("      ："+props.getProperty("user.home"));
     System.out.println("         ："+props.getProperty("user.dir"));