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TypeScript アクセス修飾子

Last updated at Posted at 2016-04-17

##アクセス修飾子

  • public

クラス外からのアクセス可能。

  • private

クラス内でのみアクセス可能。

  • protected

継承クラス内でのみアクセス可能。

  • static

静的なのでクラスで共有。

//スーパークラス定義
class Super {
    constructor() {
        this.public(); //true
        this.private(); //true
        this.protected(); //true
        this.static(); //コンパイルエラー
    }
    public public(): boolean {
        return true;
    }
    private private(): boolean {
        return true;
    }
    protected protected(): boolean {
        return true;
    }
    static static(): boolean {
        return true;
    }
}

//サブクラス定義
class Sub extends Super {
    constructor() {
        super();
        this.public(); //true
        this.private(); //コンパイルエラー
        this.protected(); //true
        this.static(); //コンパイルエラー
    }
}

//インスタンス
let test = new Sub();
test.public(); //true
test.private(); //コンパイルエラー
test.protected(); //コンパイルエラー
test.static(); //コンパイルエラー

//クラス静的メンバ
Sub.public(); //コンパイルエラー
Sub.private(); //コンパイルエラー
Sub.protected(); //コンパイルエラー
Sub.static(); //true
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