java - 每次添加到文件时如何阻止文件被覆盖？

Question

我正在尝试创建一个要添加到文件中的玩家列表，以便我可以存储它们并在需要时调用它们。

我已成功写入该文件，但每次重新写入该文件时，最后一个文件条目都会被覆盖。 有谁知道如何将每个条目保存到文件中而不每次都被覆盖？

任何帮助将不胜感激

提前致谢!!!!!!

package p;

import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Runner {

    public static final Scanner input = new Scanner(System.in);

    public static void main(String[] args) throws IOException {
        FileWriter writer = new FileWriter("output.txt");
        PlayerData player = null;
        List<PlayerData> players = new ArrayList<>();

        System.out.println("How many players do you want to register? : ");
        int num = input.nextInt();

        while (true) {

            System.out.println("Plz enter Name : ");
            String name = input.next();
            writer.write("Name: " + name + System.lineSeparator());

            System.out.println("Plz enter age : ");
            String age = input.next();
            writer.write("Age: " + age + System.lineSeparator());

            System.out.println("Plz enter Player_id : ");
            String player_id = input.next();
            writer.write("Player_id: " + player_id + System.lineSeparator());

            System.out.println("Plz enter agent_id : ");
            String agent_id = input.next();
            writer.write("Agent_id:" + agent_id + System.lineSeparator());

            System.out.println("Plz enter status : ");
            String status = input.next();
            writer.write("Status: " + status + System.lineSeparator());

            System.out.println("Plz enter position : ");
            String position = input.next();
            writer.write("Position: " + position + System.lineSeparator());

            System.out.println("Plz enter valuation : ");
            Double valuation = input.nextDouble();
            writer.write("Value: " + valuation + System.lineSeparator());

            System.out.println("\n");
            player = new PlayerData(name, age, player_id, agent_id, valuation, status, position);
            players.add(player);

            System.out.println("Information Entered: \n" + player + "\n" + "Name : " + name + "\n" + "Age: " + age
                    + "Player id: " + player_id + "\n" + "Agent id: " + agent_id + "\n" + "Player Value: " + valuation
                    + "\n" + "Player Status:" + status + "\n" + "Player position:" + position + "\n");

            writer.close();
            if (players.size() == num)

                break;
        }

        System.out.println(players);

    }

}

Answer 1

FileWriter writer = new FileWriter("output.txt", true);