java - 如何在另一个类中使用 'main' 方法中的变量？序列化

Question

这里是新手!我正在使用 Java 中的保存/加载，但我被踩住了。我的代码正确保存和加载所有内容，但我无法让这些加载的变量在加载类中的“public static void main”之外的任何地方使用。我的意思是:

我有这个保存类，它工作得很好:

package com.mestru.esport;

import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
import java.util.Random;

public class NewPlayer {

public static void main (String args[])
{
    Random rand = new Random();

    int naturalTalent = rand.nextInt(10);
    int luck = rand.nextInt(20);
    int figure = rand.nextInt(50);
    int agility = rand.nextInt(30);
    int intelligence = rand.nextInt(30);
    int multiTasking = rand.nextInt(30);
    int stamina = rand.nextInt(30);

    try
    {
        FileOutputStream saveFile = new FileOutputStream("Player.sav");
        ObjectOutputStream save = new ObjectOutputStream(saveFile);

        save.writeObject(naturalTalent);
        save.writeObject(luck);
        save.writeObject(figure);
        save.writeObject(agility);
        save.writeObject(intelligence);
        save.writeObject(multiTasking);
        save.writeObject(stamina);

        save.close();
    }
    catch(Exception exc)
    {
        exc.printStackTrace();
    }
}
}

然后我有一个类，该类旨在加载并使加载的变量可在其他类中使用。如果加载部分工作完美，那么我就无法在“main”方法之外使用它们。

package com.mestru.esport;
import java.io.FileInputStream;
import java.io.ObjectInputStream;
import java.util.Random;

public class Player
{
int naturalTalent;
int luck;
int figure;
int agility;
int intelligence;
int multiTasking;
int stamina;

public static void main (String args[]) {

    int NEWnaturalTalent = 0;
    int NEWluck = 0;
    int NEWfigure = 0;
    int NEWagility = 0;
    int NEWintelligence = 0;
    int NEWmultiTasking = 0;
    int NEWstamina = 0;


    try {
        FileInputStream saveFile = new FileInputStream("Player.sav");
        ObjectInputStream save = new ObjectInputStream(saveFile);

        NEWnaturalTalent = (Integer) save.readObject();
        NEWluck = (Integer) save.readObject();
        NEWfigure = (Integer) save.readObject();
        NEWagility = (Integer) save.readObject();
        NEWintelligence = (Integer) save.readObject();
        NEWmultiTasking = (Integer) save.readObject();
        NEWstamina = (Integer) save.readObject();

        save.close();
    } catch (Exception exc) {
        exc.printStackTrace();
    }
    Player player = new Player();

    player.naturalTalent = NEWnaturalTalent;
    player.luck = NEWluck;
    player.figure = NEWfigure;
    player.agility = NEWagility;
    player.intelligence = NEWintelligence;
    player.multiTasking = NEWmultiTasking;
    player.stamina = NEWstamina;

}

public void test ()
{
    System.out.println("Natural Talent: " + naturalTalent);
    System.out.println("Luck: " + luck);
    System.out.println("Figure: " + figure);
    System.out.println("Agility: " + agility);
    System.out.println("Intelligence: " + intelligence);
    System.out.println("Multitasking: " + multiTasking);
    System.out.println("Stamina: " + stamina);
}

}

当我在另一个类中使用“test”方法时，所有值都等于 0。

这是我的问题。我可以以某种方式使所有实例变量等于“main”方法中加载的变量吗？我也不能在“main”方法之外使用“try”:(

提前感谢您的帮助<3每一条线索都值得赞赏，我刚刚开始学习。

Answer 1

当你加载时，你创建一个新的Player，设置它然后丢弃它。

也许您打算设置当前播放器的字段。

而且您也不需要临时变量。您只需设置字段即可。

public static void main(String... ignored) throws IOException {
    Player player = new Player();
    player.load("Player.sav");
    player.test();
}

public void load(String filename) throws IOException {
  try (FileInputStream saveFile = new FileInputStream(filename);
    ObjectInputStream save = new ObjectInputStream(saveFile)) {
    naturalTalent = (Integer) save.readObject();
    luck = (Integer) save.readObject();
    figure = (Integer) save.readObject();
    agility = (Integer) save.readObject();
    intelligence = (Integer) save.readObject();
    multiTasking = (Integer) save.readObject();
    stamina = (Integer) save.readObject();
  }
}

您可以将其写入文本，而不是以二进制形式写入此数据。这将使阅读/编辑变得更容易，并且在此用例中会更加紧凑。即序列化一个 Integer 对象可能会大得惊人。