Java: Better way to convert Double object to float

Question

Suppose I'm given a Double object d and a function that takes in a primitive float, is there a better way to pass on object do to the function than by double casting?

Double fakePi = 3.14  
void function(float num) {}

function(fakePi): Returns a compiling error as function does not take Double object as argument

function((float) fakePi): Returns a compiling error as Double cannot be converted to a float

function((float) (double) fakePi): Compiles and runs without error

Although this works, my instincts tells me that there are better ways to do this and that I should avoid doing multiple type castings, especially since float, double, Double are closely related to each other.

Try fakePi.floatValue(). Always consult the documentation when in doubt. — crush
– crush, Commented Sep 14, 2014 at 22:15

Jesse Bethke · Accepted Answer · 2014-09-14 22:17:28Z

5

The Double class has a floatValue() property.

http://docs.oracle.com/javase/7/docs/api/java/lang/Double.html

function(fakePi.floatValue());

answered Sep 14, 2014 at 22:17

Jesse Bethke

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