JAutoSavePluginData

// PluginMain.java
public final class PluginMain extends JavaPlugin {
    public static PluginMain INSTANCE;
    public PluginMain() {
         INSTANCE = this;
    }
    @Override
    public onLoad() {
         this.reloadPluginData(MyPluginData.INSTANCE); // 读取文件等
    }
}

// MyPluginData.java
public class MyPluginData extends JAutoSavePluginData {
    public static final MyPluginData INSTANCE = new MyPluginData();

    public final Value<String> string = value("test"); // 默认值 "test"

    public final Value<List<String>> list = typedValue(createKType(List.class, createKType(String.class))); // 无默认值, 自动创建空 List

    public final Value<Map<Long, Object>> custom = typedValue(
            createKType(Map.class, createKType(Long.class), createKType(Object.class)),
            new HashMap<Long, Object>() {{ // 带默认值
                put(123L, "ok");
            }}
    );
}

Value<List<String>> theList = MyPluginData.INSTANCE.list; // 获取 Value 实例. Value 代表一个追踪自动保存的值.
List<String> actualList = theList.get();
theList.set();