System.getProperty ("user.dir")

    
public class Main{

  public static void main(String[] args){
    System.out.println(System.getProperty ("user.dir"));      
  }

}

1.	System.exit(int status)
2.	System.in
3.	System.in.read()
4.	System.out
5.	System: arraycopy(Object src, int srcPos, Object dest, int destPos, int length)
6.	System: clearProperty(String key)
7.	System: console()
8.	System: currentTimeMillis()
9.	System: getenv(String key)
10.	System: getProperty(String name)
11.	System: getProperty(String key, String def)
12.	System: getProperties()
13.	System.identityHashCode(Object x)
14.	System: nanoTime()
15.	System.setErr(PrintStream err)
16.	System: setIn(InputStream in)
17.	System: setOut(PrintStream err)
18.	System: setProperty(String key, String value)

System.getProperty ("user.dir") : System « java.lang « Java by API