time operations (#177)

* date operation

* time utils

* junit test

Author: realDuYuanChao

src/main/java/com/examplehub/basics/MathExample.java renamed to src/main/java/com/examplehub/basics/math/MathExample.java

@@ -1,4 +1,4 @@
-package com.examplehub.basics;
+package com.examplehub.basics.math;
 
 public class MathExample {
   public static void main(String[] args) {

src/main/java/com/examplehub/basics/system/FileSeparatorTest.java

@@ -0,0 +1,4 @@
+package com.examplehub.basics.system;
+
+public class FileSeparatorTest {
+}

src/main/java/com/examplehub/basics/time/CalendarExample.java

@@ -0,0 +1,4 @@
+package com.examplehub.basics.time;
+
+public class CalendarExample {
+}

src/main/java/com/examplehub/basics/time/DateExample.java

@@ -0,0 +1,4 @@
+package com.examplehub.basics.time;
+
+public class DateExample {
+}

src/main/java/com/examplehub/basics/time/GetTime.java

@@ -0,0 +1,4 @@
+package com.examplehub.basics.time;
+
+public class GetTime {
+}

src/main/java/com/examplehub/basics/time/InstantExample.java

@@ -0,0 +1,4 @@
+package com.examplehub.basics.time;
+
+public class InstantExample {
+}

src/main/java/com/examplehub/basics/time/LocalDateTimeExample.java

@@ -0,0 +1,5 @@
+package com.examplehub.basics.time;
+
+public class LocalDateTimeExample {
+
+}

src/main/java/com/examplehub/utils/StringUtils.java

@@ -16,4 +16,14 @@ public static String toString(byte[] bytes, int offset, int len) {
     }
     return builder.toString();
   }
+
+  public static String capitalize(String origin) {
+    if (origin == null) {
+      throw new NullPointerException();
+    }
+    if (origin.length() == 0) {
+      return "";
+    }
+    return Character.toUpperCase(origin.charAt(0)) + origin.substring(1).toLowerCase();
+  }
 }

src/test/java/com/examplehub/basics/file/CreateFolderTest.java

@@ -2,9 +2,12 @@
 
 import static org.junit.jupiter.api.Assertions.*;
 
+import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 
 class CreateFolderTest {
+
+  @Disabled
   @Test
   void test() {
     String path = "example_folder";

src/test/java/com/examplehub/basics/floats/FloatOperationTest.java

@@ -9,6 +9,7 @@ class FloatOperationTest {
   void testCompare() {
     assertEquals(0.1, 1.0 / 10);
     assertTrue(0.1 > 1 - 9.0 / 10);
+    assertEquals(0.1, 1 - 9 / 10.0, 0.00000001);
   }
 
   @Test