class JavaClass {
    JavaClass plus(Runnable i) {
        i.run();
        return this;
    }

    JavaClass minus(Runnable i) {
        i.run();
        return this;
    }

    JavaClass times(Runnable i) {
        i.run();
        return this;
    }

    JavaClass div(Runnable i) {
        i.run();
        return this;
    }

    JavaClass mod(Runnable i) {
        i.run();
        return this;
    }
}