How to get file path in java

File f = new File(this.getClass().getResource("/").getPath());
System.out.println(f);

C:\Documents%20and%20Settings\Administrator\workspace\projectName\bin

File f = new File(this.getClass().getResource("").getPath());
System.out.println(f);

C:\Documents%20and%20Settings\Administrator\workspace\projectName\bin\com\test

File directory = new File("");//参数为空
String courseFile = directory.getCanonicalPath();
System.out.println(courseFile);

URL xmlpath = this.getClass().getClassLoader().getResource("selected.txt");
System.out.println(xmlpath);

file:/C:/Documents%20and%20Settings/Administrator/workspace/projectName/bin/selected.txt

System.out.println(System.getProperty("user.dir"));

System.out.println( System.getProperty("java.class.path"));

C:\Documents and Settings\Administrator\workspace\projectName\bin