ファイル I/O 問題4[I/O ストリームを使用したファイル・アクセス]

1import java.io.*;2​3public class Main {4    public static void main(String[] args) throws IOException {5        try (Writer w = new FileWriter("a.txt")) {6            w.write("A");7        }8        try (Writer w = new FileWriter("a.txt")) {9            w.write("B");10        }11        try (Writer w = new FileWriter("a.txt", true)) {12            w.write("C");13        }14        try (BufferedReader r = new BufferedReader(new FileReader("a.txt"))) {15            System.out.println(r.readLine());16        }17    }18}