Project Coin

Connection6.java

Connection connection = null;
try {
    connection = DriverManager.getConnection("url");
    // proses SQL
} catch (SQLException e) {
    e.printStackTrace();
} finally {
    try {
        connection.close();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

Connection7.java

try (Connection connection = DriverManager.getConnection("url")) {
    // proses SQL
} catch (SQLException e) {
    e.printStackTrace();
}

Diamond.java

List<String> list = new ArrayList<>();
Map<Long, String> map = new HashMap<>();
List<Map<Long, String>> listMap = new ArrayList<>();

Generic.java

List<String> list = new ArrayList<String>();
Map<Long, String> map = new HashMap<Long, String>();
List<Map<Long, String>> listMap = new ArrayList<Map<Long, String>>();