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Java_throwsで例外処理を呼び出し元に任せよう

Posted at

paizaラーニングforTEAM Java入門編
レッスン10の#12

10-#12
// 例外処理 - throws
import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) {

        File file = new File("articles.txt");

        // ファイル書き込み
        try (FileWriter filewriter = new FileWriter(file)) {
            filewriter.write("Hello world\n");
            filewriter.write("Hello Java\n");
        } catch (IOException e) {
            System.err.println("ファイル書き込みに失敗しました");
            e.printStackTrace();
        }

        // ファイル読み込み
        file = new File("error.txt");
        try (Scanner scan = makeScanner(file)) {
            while (scan.hasNextLine()) {
                String line = scan.nextLine();
                System.out.println(line);
            }
        } catch (FileNotFoundException e) {
            System.err.println("ファイル読み込みに失敗しました");
            e.printStackTrace();
        }
    }
    
    public static Scanner makeScanner(File file) throws FileNotFoundException {
        Scanner scan = new Scanner(file);
        return scan;
    }
}
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