기본 try-with-resources 구문

[주인장]

1. 전통적인 try-finallty 방식 (Java 7 이전)

import java.util.Scanner;

public class OldStyleExample {
    public static void main(String[] args) {
        Scanner sc = null;
        try {
            sc = new Scanner(System.in);
            System.out.print("숫자를 입력하세요: ");
            int num = sc.nextInt();
            System.out.println("입력된 숫자: " + num);
        } finally {
            // 반드시 리소스를 닫아야 하므로 finally에서 처리
            if (sc != null) {
                sc.close();
            }
        }
    }
}

2. try-with-resources 방식 (Java 7 이상)

import java.util.Scanner;

public class NewStyleExample {
    public static void main(String[] args) {
        // try-with-resources: sc는 AutoCloseable이므로 자동으로 닫힘
        try (Scanner sc = new Scanner(System.in)) {             
            System.out.print("숫자를 입력하세요: ");
            int num = sc.nextInt();
            System.out.println("입력된 숫자: " + num);
        }
        // 따로 close() 호출 필요 없음
    }
}