Database Data Type DML - select SELECT * FROM tab; SELECT * FROM employees; SELECT last_name, salary FROM employees; SELECT hire_date, salary, salary * 12 FROM employees; SELECT SUM(salary), AVG(salary) FROM employees; SELECT * FROM departments; SELECT DISTINCT department_id FROM employees; SELECT salary AS ๊ธ์ฌ, salary * 12 AS ์ฐ๋ด, first_name "Your Name" FROM employees; SELECT '์ด๋ฆ์: ' || FIRST_NAM..
* ์์ธ์ฒ๋ฆฌ - try~catch - Throws - ์ฌ์ฉ์ ์ ์ ์์ธ ํด๋์ค * java.io & java.network - Network ๊ธฐ๋ณธ๊ฐ๋ - Socket ํ๋ก๊ทธ๋๋ฐ - IO ์ ์ถ๋ ฅ : Stream * Thread * Git - branch member1 -> main merge - commit ๋ฐ์ ์๋๋ ํ์ ํด๊ฒฐ (merge)
Today I Learned - Collection Framework java.util.List - LinkedList add(E e) / add(int index, E e) get(int index) size() set(int index, E e) remove(int index) clear() java.util.Map - value๊ฐ๋ง ์ค๋ณต ํ์ฉ o, key๊ฐ์ ์ค๋ณต ํ์ฉ x put(K, V) get(K) remove(K) / remove(K, V) clear() keySet() java.util.Set - ์ค๋ณต ํ์ฉ x , List์ ๋น์ทํจ Iterator - Set์ ์์๋ค์ ํ๋์ฉ ๊บผ๋ผ ๋ ์ฌ์ฉ Iterator ๋ณ์๋ช = hashset.iterator(); ..
Today I Learned - java.util.StringTokenizer : ํ๋์ ๋ฌธ์์ด์ ์ฌ๋ฌ ๊ฐ๋ก ๋ถ๋ฆฌ - Collection Framework : ๋ฐ์ดํฐ๋ค์ ์งํฉ java.util.List - ArrayList add(E e) / add(int index, E e) get(int index) size() set(int index, E e) remove(int index) clear() * Student ์์ ์ฐ์ต
Today I Learned java.lang.String package - replace(), toLowerCase(), toUpperCase(), trim(), valueOf(), split() java.lang.StringBuffer - append() Wrapper
์ค๋ ๋ฐฐ์ด ๊ฒ์ ๊ธฐ๋กํ๋ ์ต๊ด์ ๊ธฐ๋ฅด๊ธฐ GitHub์๋ ์ ๋ฆฌํ๊ธฐ
