[JAVA] data type 자료형 예제

package dayday02;
/*
 * < 자료형  Data type >
 *  - integer, float, address, character, boolean..
 *  1. 원시 자료형(Primitive type) <- today class
 *  2. 참조 자료형(Reference type)
 *  
 *  <Primitive type>
 *  1.integer
 *  	- byte 	-> 1byte
 *  	- short -> 2byte
 *  	- int 	-> 4byte **
 *  	- long 	-> 8byte
 *  
 *  2. float
 *  	-float	-> 4byte
 *  	-double	-> 8byte ** 3.14, 11.9...
 *  
 *  3. a character
 *  	- char	-> 2byte for UNICODE ** but 1byte on C lang
 *  	- ex) '가'/'A'/'1'/'g'
 *  
 *  4. bool(true or false)
 *  	- boolean	-> 4byte
 *  				-> it just have ture/false data
 *  5. String(Originally Reference type)
 *  	
 *  
 */
public class test01 {
	public static void main(String[] args) {
		System.out.println(10+20);				//10,20 has a electronic signal(literal integer)
		System.out.println(10000000000000L); 	//L or l whatever
		System.out.println('A'+0); 				//A = 65
		System.out.println("A"+0);				//A = A
		
		System.out.println("안녕 나는 \"피카츄\"");	
		
		
		System.out.println(false);				//Boolean false
		System.out.println("false");			//String false
		
		boolean bools = true;
		
		
		
		
	}

}