initial commit

src/uebung07/quantities/plain/Length.java

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+package quantities.plain;
+
+import static quantities.plain.LengthUnit.METER;
+import static quantities.plain.TimeUnit.SECOND;
+import static quantities.plain.VelocityUnit.METER_PER_SECOND;
+
+public class Length extends Quantity {
+    private final LengthUnit unit;
+
+    public Length(double value, LengthUnit unit) {
+        super(value, unit);
+        this.unit = unit;
+    }
+
+    public Length plus(Length other) {
+        return new Length(value + other.getBaseValue() / unit.baseFactor, unit);
+    }
+
+    public Length minus(Length other) {
+        return new Length(value - other.getBaseValue() / unit.baseFactor, unit);
+    }
+
+    public Length mult(double f) {
+        return new Length(value * f, unit);
+    }
+
+    public Length div(double f) {
+        return new Length(value / f, unit);
+    }
+
+    public Length to(LengthUnit unit) {
+        return new Length(getBaseValue() / unit.baseFactor, unit);
+    }
+
+    public double div(Length other) {
+        return getBaseValue() / other.getBaseValue();
+    }
+
+    public Velocity div(Time t) {
+        return new Velocity(this.value(METER) / t.value(SECOND), METER_PER_SECOND);
+    }
+
+    public Time div(Velocity v) {
+        return new Time(this.value(METER) / v.value(METER_PER_SECOND), SECOND);
+    }
+}