[Java] 변환

1. 문자열을 정수로 변환

parseInt() 메서드

public class StringToIntExample {
    public static void main(String[] args) {
        String strNumber = "12345";
        int number = Integer.parseInt(strNumber);
        System.out.println(number); // Output: 12345
    }
}
 

3. 문자열을 Long으로 변환

Long.parseLong() 메서드

public class StringToLongExample {
    public static void main(String[] args) {
        String strNumber = "9876543210";
        long number = Long.parseLong(strNumber);
        System.out.println(number); // Output: 9876543210
    }
}
 

4. Long을 문자열로 변환

String.valueOf() 메서드

public class LongToStringExample {
    public static void main(String[] args) {
        long number = 9876543210L;
        String strNumber = String.valueOf(number);
        System.out.println(strNumber); // Output: "9876543210"
    }
}
 

Long.toString() 메서드

 

public class LongToStringExample {
    public static void main(String[] args) {
        long number = 9876543210L;
        String strNumber = Long.toString(number);
        System.out.println(strNumber); // Output: "9876543210"
    }
}