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1   package com.puppycrawl.tools.checkstyle.grammars.java8;
2   import java.util.function.Function;
3   import java.util.logging.Logger;
4   
5   
6   public class InputLambda15
7   {
8       private static final Logger LOG = Logger.getLogger(InputLambda15.class.getName());
9   
10      public static void main(String[] args) {
11          InputLambda15 ex = new InputLambda15();
12          Function<Double, Double> sin = d -> ex.sin(d);
13          Function<Double, Double> log = d -> ex.log(d);
14          Function<Double, Double> exp = d -> ex.exp(d);
15          InputLambda15 compose = new InputLambda15();
16          LOG.info(compose.calculate(sin.compose(log), 0.8).toString());
17          // prints log:sin:-0.22
18          LOG.info(compose.calculate(sin.andThen(log), 0.8).toString());
19          // prints sin:log:-0.33
20          LOG.info(compose.calculate(sin.compose(log).andThen(exp), 0.8).toString());
21          //log:sin:exp:0.80
22          LOG.info(compose.calculate(sin.compose(log).compose(exp), 0.8).toString());
23          //exp:log:sin:0.71
24          LOG.info(compose.calculate(sin.andThen(log).compose(exp), 0.8).toString());
25          //exp:sin:log:-0.23
26          LOG.info(compose.calculate(sin.andThen(log).andThen(exp), 0.8).toString());
27          //sin:log:exp:0.71
28   
29      }
30  
31      public Double calculate(Function<Double, Double> operator, Double d)
32      {
33          return operator.apply(d);
34      }
35  
36      public Double sin(Double d)
37      {
38          LOG.info("sin:");
39          return Math.sin(d);
40      }
41  
42      public Double log(Double d)
43      {
44          LOG.info("log:");
45          return Math.log(d);
46      }
47  
48      public Double exp(Double d)
49      {
50          LOG.info("exp:");
51          return Math.exp(d);
52      }
53  }