java里的路径

System.out.println(Thread.currentThread().getContextClassLoader().getResource(""));    

    System.out.println(Main.class.getClassLoader().getResource(""));       

    System.out.println(ClassLoader.getSystemResource(""));       
    System.out.println(Main.class.getResource(""));       
    System.out.println(Main.class.getResource("/")); //Class文件所在路径 
    System.out.println(new File("/").getAbsolutePath());       
    System.out.println(System.getProperty("user.dir"));