Go 语法：
按照题库也刷一遍，和Java基本类似，也和cpp很像

刚才学了计算机里的抽象
比如不同类里的重复的功能：保存文件
就可以抽象成

//Typescript语言
abstract class FileSaver {
    protected fileName: string;
    public constructor(fileName: string){
        this.fileName = fileName;
    }
    abstract save(gameState: GameState): void;
}

然后别的类去继承这个

abstract class FileSaver {
    protected fileName: string;
    public constructor(fileName: string){
        this.fileName = fileName;
    }
    abstract save(gameState: GameState): void;
}
class XmlFileSaver extends FileSaver{
    public save(gameState: GameState): void {
        const xmlBuilder = new xml2js.xmlBuilder();
        // some logic of xml conversion
        const xmlStr = xmlBuilder.buildObject(gameState);
        fs.writeFileSync(this.fileName, xmlStr);
    }
}
class JsonFileSaver extends FileSaver{
    public save(gameState: GameState): void {
        const jsonBuilder = new json2js.jsonBuilder();
        // some logic of json conversion
        const jsonStr = JSON.stringify(gameState);
        fs.writeFileSync(this.fileName, jsonStr);
    }