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  1. import java.lang.reflect.InvocationTargetException;
  2. import java.lang.reflect.Method;
  3. import java.util.ArrayList;
  4. import java.util.Arrays;
  5. import java.util.Collection;
  6. import java.util.List;
  7.  
  8. public class Main
  9. {
  10.    static <A,B> void addAll(Collection<B> dest, Collection<A> source, String methodName)
  11.           throws IllegalAccessException, InvocationTargetException, NoSuchMethodException
  12.    {
  13.       Method m = null;
  14.       for (A a: source)
  15.       {
  16.          if (m == null)
  17.             m = a.getClass().getMethod(methodName);
  18.          dest.add((B)m.invoke(a));
  19.       }
  20.    }
  21.  
  22.    public static void main(String[] args) throws Exception
  23.    {
  24.       ArrayList<String> s = new ArrayList<String>();
  25.       List<Integer> i = Arrays.asList(1,2,3);
  26.       addAll(s, i, "toString");
  27.       System.out.println(s);
  28.    }
  29. }
Success #stdin #stdout 0.06s 380224KB
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Standard input is empty
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[1, 2, 3]
https://ideone.com/cCj8JF
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
secret

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