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Java quantities library

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package io.github.kamilszewc.javaquantitieslibrary;

public class Temperature {

    public enum Unit {K}

    private final float value;
    private final Unit unit;

    public Temperature(float value) {
        this.value = value;
        this.unit = Unit.K;
    }

    public Temperature(float value, Unit unit) {
        if (unit == null) throw new NullPointerException("Unit can not be null");
        this.value = value;
        this.unit = unit;
    }

    public float getValue() {
        return value;
    }

    public float getK() {
        return value;
    }

    public Temperature add(Temperature temperature) {
        return new Temperature(this.value + temperature.value, Unit.K);
    }

    public Temperature sub(Temperature temperature) {
        return new Temperature(this.value - temperature.value, Unit.K);
    }

    public Temperature mul(Temperature temperature) {
        return new Temperature(this.value * temperature.value, Unit.K);
    }

    public Temperature div(Temperature temperature) {
        return new Temperature(this.value / temperature.value, Unit.K);
    }


    @Override
    public String toString() {
        return value + " " + unit;
    }
}