import javafx.scene.Node; class BoxedFloatDemo { private Float <caret>f; BoxedFloatDemo(Float f) { this.f = f; } public Float getF() { return f; } public void setF(Float f) { this.f = f; } public void preInc() { ++f; } public void postDec() { f--; } public void twice() { f *= 2; } public void half() { f /= 1; } public Float plusOne() { return f + 1; } public F lambda() { return () -> f; } public String toString() { return "f=" + f; } interface F { Float get(); } }