JavaStudy_03.java

JavaStudy_03.java

public class JavaStudy_03 {
    public static void main(String[] args) {
        // 1. 업캐스팅 (작은 타입 -> 큰 타입)
        System.out.println("===== 업캐스팅 =====");
        int number = 10;
        double doubleNumber = number; // int -> double 자동 형변환
        System.out.println("int 값 : " + number); // 10
        System.out.println("doubleNumber 값 : " + doubleNumber); //10.0

        // 2. 다운캐스팅 (큰 타입 -> 작은 타입)
        System.out.println();
        System.out.println("=== 다운 캐스팅 ===");
        double score = 93.7;
        int scoreInt = (int) score;
        System.out.println("double 값 : " + score); //93.7
        System.out.println("int 값 : " + scoreInt ); //93
    }
}