Java: adjust examples

other/java/examples/src/main/java/com/seaweedfs/examples/UnzipFile.java → other/java/examples/src/main/java/com/seaweedfs/examples/ExampleReadFile.java

@@ -9,7 +9,7 @@ import java.io.InputStream;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipInputStream;
 
-public class UnzipFile {
+public class ExampleReadFile {
 
     public static void main(String[] args) throws IOException {
 

other/java/examples/src/main/java/com/seaweedfs/examples/WatchFiles.java → other/java/examples/src/main/java/com/seaweedfs/examples/ExampleWatchFileChanges.java

@@ -7,7 +7,7 @@ import java.io.IOException;
 import java.util.Date;
 import java.util.Iterator;
 
-public class WatchFiles {
+public class ExampleWatchFileChanges {
 
     public static void main(String[] args) throws IOException {
 

other/java/examples/src/main/java/com/seaweedfs/examples/WriteFile.java → other/java/examples/src/main/java/com/seaweedfs/examples/ExampleWriteFile.java

@@ -9,7 +9,7 @@ import java.io.InputStream;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipInputStream;
 
-public class WriteFile {
+public class ExampleWriteFile {
 
     public static void main(String[] args) throws IOException {