fork download
copy 
  1. import java.lang.reflect.Method;
  2. import java.util.Arrays;
  3. import java.util.List;
  4. import java.util.stream.Collectors;
  5.  
  6.  
  7. public class Main
  8. {
  9.     public static void main(String[] args)
  10.     {
  11.         Condition c = new Condition();
  12.         List<Class<? extends Base>> classList = Arrays.asList(ClassFoo.class, ClassBaa.class);
  13.  
  14.         List<Base> result = classList.stream()
  15.                 .map(e -> newInstanceWithCondition(e, c))
  16.                 .collect(Collectors.toList());
  17.  
  18.         result.forEach(System.out::println);
  19.     }
  20.  
  21.  
  22.     static Base newInstanceWithCondition(Class<? extends Base> clazz, Condition c)
  23.     {
  24.         try
  25.         {
  26.             Method method = clazz.getMethod("newInstanceWithCondition", Condition.class);
  27.             return (Base) method.invoke(null, c);
  28.         } catch (Exception e)
  29.         {
  30.             throw new RuntimeException(e);
  31.         }
  32.     }
  33. }
  34.  
  35. class Base
  36. {
  37.     @Override
  38.     public String toString()
  39.     {
  40.         return String.format("%sのインスタンスです。", getClass());
  41.     }
  42. }
  43.  
  44.  
  45. interface BaseIF{}
  46.  
  47.  
  48. class Condition{}
  49.  
  50.  
  51. class ClassFoo extends Base implements BaseIF
  52. {
  53.     public static ClassFoo newInstanceWithCondition(Condition c)
  54.     {
  55.         System.out.println("ClassFoo#newInstanceWithCondition(Condition c)が呼ばれました");
  56.         return new ClassFoo();
  57.     }
  58. }
  59.  
  60.  
  61. class ClassBaa extends Base implements BaseIF
  62. {
  63.     public static ClassBaa newInstanceWithCondition(Condition c)
  64.     {
  65.         System.out.println("ClassBaa#newInstanceWithCondition(Condition c)が呼ばれました");
  66.         return new ClassBaa();
  67.     }
  68. }
Success #stdin #stdout 0.08s 711168KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
ClassFoo#newInstanceWithCondition(Condition c)が呼ばれました
ClassBaa#newInstanceWithCondition(Condition c)が呼ばれました
class ClassFooのインスタンスです。
class ClassBaaのインスタンスです。
https://ideone.com/nb6DeB
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!