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How it works...

You can create and pass around an implementation of any functional interface as you do with any object. For example, let's write a method that creates Function<Integer, Double>:

`Function<Integer, Double> createMultiplyBy10(){  Function<Integer, Double> ourFunc = new Function<Integer, Double>(){    public Double apply(Integer i){ return i * 10.0; }  };  return ourFunc;}`

Better yet, we can create a generic method that uses the following:

`Function<Integer, Double> createMultiplyBy(double num){  Function<Integer, Double> ourFunc = new Function<Integer, Double>(){    public Double apply(Integer i){ return i * num; }  };  return ourFunc;}`

Now we can write this:

`Function<Integer, Double> multiplyBy10 = createMultiplyBy(10d);System.out.println(multiplyBy10.apply(1)); ...`

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