System.out.println(SystemUtil.PATH_SEPARATOR);
        System.out.println(SystemUtil.OS_NAME);
        System.out.println(SystemUtil.JAVA_IO_TMPDIR);
        System.out.println(SystemUtil.USER_DIR);
        System.out.println(SystemUtil.USER_HOME);
    }

     */
    public static final String JAVA_IO_TMPDIR = System.getProperty("java.io.tmpdir");

    /**
     * <code>user.dir</code> システムプロパティ。
     */
    public static final String USER_DIR = System.getProperty("user.dir");

    /**
     * <code>user.home</code> システムプロパティ。
     */
    public static final String USER_HOME = System.getProperty("user.home");

    public static long currentTimeMillis() {

  LINE_SEPARATOR("line.separator"),

  /** User's account name. */
  USER_NAME("user.name"),

  /** User's home directory. */
  USER_HOME("user.home"),

  /** User's current working directory. */
  USER_DIR("user.dir");

  private final String key;

  StandardSystemProperty(String key) {
    this.key = key;
  }

  /** Returns the key used to look up this system property. */
  public String key() {