자바 자료형

[ 자바 자료형 ]

public class variable_ {

public static void main(String[] args) {

// TODO Auto-generated method stub

// 자주 쓰이는 자료형

boolean stu_true = true;

boolean stu_false = false;

/* AND 연산자 */

System.out.printf("true and false => %s\n", stu_true && stu_false );

System.out.printf("false and true => %s\n", stu_false && stu_true );

System.out.printf("true and true => %s\n", stu_true && stu_true );

System.out.printf("false and false => %s\n", stu_false && stu_false );

/*  결과

true and false => false

false and true => false

true and true => true

false and false => false

*/

/* OR 연산자 */

System.out.printf("true or false => %s\n", stu_true || stu_false );

System.out.printf("false or true => %s\n", stu_false || stu_true );

System.out.printf("true or true => %s\n", stu_true || stu_true );

System.out.printf("false or false => %s\n", stu_false || stu_false );

/*  결과

true or false => true

false or true => true

true or true => true

false or false => false

*/

/* not 연산자 */ 

System.out.printf("not true => %s\n", !stu_true  );

System.out.printf("not false=> %s\n", !stu_false );

/* 결과

   not true => false

                 not false=> true

*/

/* 이중 부정 */

System.out.printf("not(not(true)) => %s \n", !(!stu_true));

System.out.printf("not(not(false)) => %s \n", !(!stu_false));

/* 결과

  not(not(true)) => true

  not(not(false)) => false

*/

}

}

============================ 문자 (char) =============================

// http://www.unicode.org/charts/
public class unicode_ {
 
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        
        char han_kim = '김';
        char han_jun = '준';
        char han_hyeon = '현';
        
        //===========================================
        System.out.printf("%d \n", (int)(han_kim));
        // 44608 
        
        System.out.printf("%c \n", (char)(44608));
        // 김
        System.out.printf("%c \n", 0xae40);
        System.out.printf("%c \n", '\uae40');
        // hex(decimal(44608)) ==> 0xae40 
        
        
        //===========================================
        System.out.printf("%d \n", (int)(han_jun));
        // 51456
        
        System.out.printf("%c \n", (char)(51456));
        // 준
        
        System.out.printf("%c \n", 0xc900);
        System.out.printf("%c \n", '\uc900');
        // hex(decimal(51456)) ==> 0xd604 
        
        //===========================================
        System.out.printf("%d \n", (int)(han_hyeon));
        // 54788
        
        System.out.printf("%c \n", (char)(54788));
        // 현
        
        System.out.printf("%c \n", 0xd604);
        System.out.printf("%c \n", '\ud604');
        // hex(decimal(54788)) ==> 0xd604 
        //===========================================
    }
 
}