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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5.  
  6. /* Name of the class has to be "Main" only if the class is public. */
  7. public class Main
  8. {
  9.  
  10. 	public static boolean belongsToAllowedTypes(Object value) {
  11.     if (value == null) {
  12.         return true;
  13.     } else if (value instanceof Boolean) {
  14.         return true;
  15.     } else if (value instanceof String) {
  16.         return true;
  17.     } else if (value instanceof Number) {
  18.         return true;
  19.     } else if (value instanceof byte[]) {
  20.         return true;
  21.     } else if (value instanceof Set) {
  22.         return containsAllowedTypes(((Set<Object>) value).iterator());
  23.     } else if (value instanceof List) {
  24.         return containsAllowedTypes(((List<Object>) value).iterator());
  25.     } else if (value instanceof Map) {
  26.         return containsAllowedTypes(((Map<String, Object>) value).values().iterator());
  27.     } else {
  28.         return false;
  29.     }
  30. }
  31.  
  32. public static boolean containsAllowedTypes(Iterator iterator) {
  33.     boolean instanceOfAllowedTypes = true;
  34.     while (iterator.hasNext() && instanceOfAllowedTypes) {
  35.         instanceOfAllowedTypes = belongsToAllowedTypes(iterator.next());
  36.     }
  37.     return instanceOfAllowedTypes;
  38.  
  39. }
  40.  
  41. 	public static void main (String[] args) throws java.lang.Exception
  42. 	{
  43. 		List stringlist = new ArrayList<>();
  44. 		stringlist.add("astring");
  45. 		System.out.println(belongsToAllowedTypes(stringlist));
  46. 	}
  47. }
Success #stdin #stdout 0.1s 320576KB
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https://ideone.com/vyIBRx
http://c...content-available-to-author-only...e.com/questions/117230/restricting-types-not-related-through-inheritance-without-using-instanceof-by-cr
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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