File operation (#201)

* refactor directory

* list files recursion

Author: realDuYuanChao

src/main/java/com/examplehub/basics/file/CreateFolder.java renamed to src/main/java/com/examplehub/basics/io/CreateFolder.java

@@ -1,4 +1,4 @@
-package com.examplehub.basics.file;
+package com.examplehub.basics.io;
 
 import java.io.File;
 

src/main/java/com/examplehub/basics/file/DeleteEmptyFolder.java renamed to src/main/java/com/examplehub/basics/io/DeleteEmptyFolder.java

@@ -1,4 +1,4 @@
-package com.examplehub.basics.file;
+package com.examplehub.basics.io;
 
 public class DeleteEmptyFolder {
   public static boolean delete(String folderPath) {

src/main/java/com/examplehub/basics/file/DeleteFile.java renamed to src/main/java/com/examplehub/basics/io/DeleteFile.java

@@ -1,4 +1,4 @@
-package com.examplehub.basics.file;
+package com.examplehub.basics.io;
 
 import java.io.File;
 

src/test/java/com/examplehub/basics/file/CreateFolderTest.java renamed to src/test/java/com/examplehub/basics/io/CreateFolderTest.java

@@ -1,7 +1,8 @@
-package com.examplehub.basics.file;
+package com.examplehub.basics.io;
 
 import static org.junit.jupiter.api.Assertions.*;
 
+import com.examplehub.basics.io.CreateFolder;
 import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 

src/test/java/com/examplehub/basics/file/DeleteEmptyFolderTest.java renamed to src/test/java/com/examplehub/basics/io/DeleteEmptyFolderTest.java

@@ -1,4 +1,4 @@
-package com.examplehub.basics.file;
+package com.examplehub.basics.io;
 
 import static org.junit.jupiter.api.Assertions.*;
 

src/test/java/com/examplehub/basics/file/DeleteFileTest.java renamed to src/test/java/com/examplehub/basics/io/DeleteFileTest.java

@@ -1,4 +1,4 @@
-package com.examplehub.basics.file;
+package com.examplehub.basics.io;
 
 import static org.junit.jupiter.api.Assertions.*;
 

src/test/java/com/examplehub/basics/io/FileExampleTest.java

@@ -6,10 +6,39 @@
 import java.io.IOException;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.text.SimpleDateFormat;
+import java.util.Date;
 import java.util.Objects;
 import org.junit.jupiter.api.Test;
 
 class FileExampleTest {
+
+  @Test
+  void testInit() {
+    File file = new File("pom.xml");
+    file = new File("/root/example_dir/example_file.txt");
+  }
+
+  @Test
+  void testLength() {
+    File file = new File("pom.xml");
+    assertTrue(file.length() >= 0);
+  }
+
+  @Test
+  void testLastModified() {
+    File file = new File("pom.xml");
+    long lastModified = file.lastModified();
+    String date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date(lastModified));
+    System.out.println(date); // 2021-08-31 09:27:21
+  }
+
+  @Test
+  void testGetName() {
+    File file = new File("pom.xml");
+    assertEquals("pom.xml", file.getName());
+  }
+
   @Test
   void testPath() throws IOException {
     File file = new File("../example.txt");
@@ -72,6 +101,7 @@ void testList() {
   void testListWithFilter() {
     File file = new File(".");
     File[] files = file.listFiles((dir, name) -> name.endsWith(".xml"));
+    assert files != null;
     assertEquals(1, files.length);
     assertEquals("pom.xml", files[0].getName());
   }
@@ -81,6 +111,7 @@ void testMkdir() {
     File file = new File("temp");
     assertTrue(file.mkdir());
     assertTrue(file.delete());
+    assertFalse(file.exists());
   }
 
   @Test
@@ -90,6 +121,7 @@ void testMkdirs() {
     assertTrue(file.delete());
     assertTrue(new File("temp/sub").delete());
     assertTrue(new File("temp").delete());
+    assertFalse(file.exists());
   }
 
   @Test
@@ -101,4 +133,21 @@ void testPaths() {
     File file = path.toFile();
     assertEquals("pom.xml", file.getName());
   }
+
+  @Test
+  void testExists() {
+    File file = new File("pom.xml");
+    assertTrue(file.exists());
+    file = new File("pom_bk.xml");
+    assertFalse(file.exists());
+  }
+
+  @Test
+  void testDelete() throws IOException {
+    File file = new File("pom_bk.xml");
+    assertTrue(file.createNewFile());
+    assertTrue(file.exists());
+    assertTrue(file.delete());
+    assertFalse(file.exists());
+  }
 }

src/test/java/com/examplehub/basics/io/FileOutputStreamExampleTest.java

@@ -2,7 +2,6 @@
 
 import static org.junit.jupiter.api.Assertions.*;
 
-import com.examplehub.basics.file.DeleteFile;
 import java.io.*;
 import java.nio.charset.StandardCharsets;
 import org.junit.jupiter.api.Test;

src/test/java/com/examplehub/basics/io/RecursionPrintDirectoryTest.java

@@ -1,12 +1,14 @@
 package com.examplehub.basics.io;
 
-import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
 
 import java.io.File;
-import org.junit.jupiter.api.Test;
 
 class RecursionPrintDirectoryTest {
+
   @Test
+  @Disabled
   void test1() {
     RecursionPrintDirectory.printFiles(new File("src/main/java"));
   }