class Point {
    int x;
    int y;
    // コンストラクタを設定する
    Point(int x, int y) {
        this.x = x;
        this.y = y;
    }
    // 自身を返すようにする
    Point multiply(int n) {
        this.x *= n;
        this.y *= n;
        return this;
    }
    boolean isSamePosition(Point p) {
        // そもそも条件節に入るものはtrueかfalseを返すのは自明なんで、改めて条件で分岐してtrueやfalseを返さない
        // 直接真偽値を演算する「論理演算」自体をを返してしまえ
        return this.x == p.x && this.y == p.y;
    }
}
 

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