[자바 (JAVA)] 47. Wrapper

package ex17;

class User {
    private Long no;
    private String name;
    private Integer money;

    public User(Long no, String name, Integer money) {
        this.no = no;
        this.name = name;
        this.money = money;
    }

    public Long getNo() {
        return no;
    }

    public String getName() {
        return name;
    }

    public Integer getMoney() {
        return money;
    }
}

public class Wrap01 {
    public static void main(String[] args) {
        // 1. 회사 운영
        User user = new User(1L, "홍길동", null);
    }
}

package ex17;

public class Wrap02 {
    public static void main(String[] args) {
        String s1 = "10";
        Integer i1 = Integer.parseInt(s1); // 문자를 숫자로 / 문자 -> 숫자

        Integer i2 = 20;
        String s2 = i2 + "";
        String s3 = i2.toString();
    }
}

❗ 중요 !!

int → Integer

char → Character

long → Long n = 10L