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  1. import java.util.*;
  2. import java.util.function.*;
  3. import java.io.*;
  4.  
  5. class Example {
  6.     public static void main(String[] args) {
  7.     	Comparator<String> nonSerializableComparator =
  8.     		(Comparator<String>) (a, b) -> 0;
  9. 		test("non-serializable method ref",
  10. 			(Comparator<String> & Serializable)
  11. 				nonSerializableComparator::compare);
  12. 		test("non-serializable lambda",
  13. 			(Comparator<String> & Serializable)
  14. 				(a, b) -> nonSerializableComparator.compare(a, b));
  15. 		Comparator<String> serializableComparator =
  16. 			(Comparator<String> & Serializable) (a, b) -> 0;
  17. 		test("serializable method ref",
  18. 			(Comparator<String> & Serializable)
  19. 				serializableComparator::compare);
  20. 		test("serializable lambda",
  21. 			(Comparator<String> & Serializable)
  22. 				(a, b) -> serializableComparator.compare(a, b));
  23.     }
  24.  
  25.     static void test(String type, Object obj) {
  26.     	try {
  27.     		obj = serialize(obj);
  28.     		System.out.printf("%s passed.%n", type);
  29.     	} catch (Exception e) {
  30.     		System.out.printf("%s failed with %s%n", type, e.getClass().getName());
  31.     	}
  32.     }
  33.  
  34.     static Object serialize(Object obj) throws Exception {
  35.         ByteArrayOutputStream bytesOut =
  36.             new ByteArrayOutputStream();
  37.         ObjectOutputStream objsOut =
  38.             new ObjectOutputStream(bytesOut);
  39.  
  40.         objsOut.writeObject(obj);
  41.  
  42.         ByteArrayInputStream bytesIn =
  43.             new ByteArrayInputStream(bytesOut.toByteArray());
  44.         ObjectInputStream objsIn =
  45.             new ObjectInputStream(bytesIn);
  46.  
  47.         return objsIn.readObject();
  48.     }
  49.  
  50.     static {
  51.         Thread.currentThread()
  52.             .setUncaughtExceptionHandler((t, e) ->
  53.                 e.printStackTrace(System.out));
  54.     }
  55. }
Success #stdin #stdout 0.26s 320896KB
comments (?)
stdin 
Standard input is empty
stdout 
non-serializable method ref failed with java.io.NotSerializableException
non-serializable lambda failed with java.io.NotSerializableException
serializable method ref passed.
serializable lambda passed.
https://ideone.com/8u8ZuL
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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