Differences

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--- public:computer:java [2021/12/17 18:40] – [References] alex
+++ public:computer:java [2022/09/15 23:06] – alex
@@ Line 1: / Line 1: @@
 ====== Java ======
+  * ''String'' -> ''StringBuilder''
+  * ''java.util.Date'' <-> ''java.time.Instant''
+  * ''java.util.Calendar'' -> ''java.time.Instant''
+  * ''java.text.SimpleDateFormat''
+  * ''java.time''
+    * Local
+    * Zoned
+    * Offset
+  * Collections
+    * List; ArrayList, LinkedList
+    * Set; HashSet, LinkedHashSet
+    * Map; HashMap, LinkedHashMap
+    *
+  * 람다식
+  (자료형 인수, ...) -> { ... 임의의 처리 ...}
+==== Database ====
+<sxh java>
+import java.sql.*;
+...
+...
+  Connection conn = null;
+  try
+  {
+    Class.forName("DRIVER");
+  }
+  catch(ClassNotFoundException e)
+  {
+    e.printStackTrace();
+  }
+  try
+  {
+    conn = DriverManager.getConnection("jdbc database", "user", "password");
+    Statement stmt = conn.createStatement();
+    ResultSet rset = stmt.executeQuery("QUERY");
+    while(rset.next())
+    {
+      // do something
+    }
+  }
+  catch(SQLException e)
+  {
+    e.printStackTrace();
+  }
+  finally
+  {
+    if(conn != null)
+    {
+      try
+      {
+        conn.close();
+        conn = null;
+      }
+      catch(SQLException e)
+      {
+        e.printStackTrace();
+      }
+    }
+  }
+...
+...
+</sxh>
+  * conn.setAutoCommit(true/false);
+  * conn.commit();
+  * conn.rollback()
+  * PreparedStatement stmt = conn.prepareStatement(".... ?");
+    * stmt.setString(1, "value");
+  * DAO<sup>Data Access Object</sup>
+  * DTO<sup>Data Transfer Object</sup>
+  * JPA<sup>Java Persistence API</sup>
+==== File I/O ====
+  * FileReader
+  * BufferedReader
+  * Scanner
+  * Files
+  * CSV, XML, LOGGER
+==== Tests ====
+  * JUint
+    * @Test
+    * @Before
+    * @After
+    * @BeforeClass
+    * @AfterClass
+    * @Ignore
+    * import static org.junit.Assert.*;
+      * assertEquals()
+      * fail()
+      * assertThat()
+      * import static org.hamcrest.CoreMatchers.*;
+        * is()
+  * JMockit
+  * DbUnit
+==== Reserved Words ====
+  * data types <list-group>
+  * byte
+  * short
+  * int
+  * long
+  * float
+  * double
+  * char
+  * boolean
+  * void
+</list-group>
+  * class & packages <list-group>
+  * class
+  * interface
+  * enum
+  * package
+  * import
+  * extends
+  * implements
+  * this
+  * super
+  * new
+</list-group>
+  * modifiers <list-group>
+  * public
+  * protected
+  * private
+  * static
+  * final
+  * abstract
+  * native
+  * volatile
+  * transient
+  * synchronized
+  * strictfp
+</list-group>
+  * operations <list-group>
+  * if
+  * else
+  * switch
+  * case
+  * default
+  * for
+  * while
+  * do
+  * break
+  * continue
+  * return
+  * instanceof
+  * assert
+</list-group>
+  * exceptions <list-group>
+  * try
+  * catch
+  * finally
+  * throw
+  * throws
+</list-group>
+  * others <list-group>
+  * const
+  * goto
+</list-group>
 ===== References =====
   * [[https://wikidocs.net/book/31|점프 투 자바]]
   * [[https://m.blog.naver.com/ehe123/221290351142|[자바 IDE] IntelliJ vs Eclipse 비교]]
+  * [[https://madplay.github.io/post/difference-between-dollar-sign-and-sharp-sign-in-mybatis|MyBatis에서 샾(#{})과 달러(${})의 차이는 무엇일까?]]
+  * [[https://java-design-patterns.com/principles/|Java Design Patterns]]
+  * [[https://github.com/iluwatar/java-design-patterns|Design patterns implemented in Java]]
+  * [[https://github.com/lesstif/TIL/blob/master/JAVA/%EC%9E%90%EB%B0%94-%EC%BD%94%EB%93%9C%EB%A5%BC-%EC%A1%B0%EC%9E%91%ED%95%98%EB%8A%94-%EB%8B%A4%EC%96%91%ED%95%9C%EB%B0%A9%EB%B2%95.md|자바-코드를-조작하는-다양한방법.md]]