package chapter25.kadai3;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class FileIOMain {
    List<String> list = new ArrayList<>();

    class FileIOThread extends Thread {
        private String fname;

        public FileIOThread(String fname) {
            this.fname = fname;
        }

        public void run() {
            try (BufferedReader reader
             = new BufferedReader(new FileReader(fname))) {
             
                System.out.println
                    (getName() + " "+ fname + " read start");
                    
                while(reader.ready()) {
                    list.add(reader.readLine());
                }
                
                System.out.println(getName() + " read end");
                
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public Thread callThread(String fName) {
        FileIOThread t = new FileIOThread(fName);
        t.start();
        return t;
    }
    
    public static void main(String[] args) {
        FileIOMain fio = new FileIOMain();

        Thread t1 = fio.callThread("input1.txt");
        Thread t2 = fio.callThread("input2.txt");
        Thread t3 = fio.callThread("input3.txt");
        
        try {
            // Threadクラスのjoin()メソッドは、スレッドの終了を待つ
            t1.join();
            t2.join();
            t3.join();
            
        } catch(InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("list.size() = " + fio.list.size());
    }
}