java
....\hello.class
....\hello.java
....\hello.txt
....\paixu.class
....\paixu.java
....\paixu.txt
....\sum.class
....\sum.java
....\sum.java.bak
....\sum.txt
....\tuxing.class
....\tuxing.java
....\tuxing.txt
....\tuxing2.class
....\tuxing2.java
....\tuxing2.txt