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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6. import java.util.function.*;
  7.  
  8. /* Name of the class has to be "Main" only if the class is public. */
  9. class Ideone
  10. {
  11. 	static Map<Class<?>,Predicate<String>> canParse = new HashMap<>();
  12.  
  13. 	static {
  14. 		canParse.put(Integer.TYPE, s -> {try {Integer.parseInt(s); return true;} catch(Exception e) {return false;}});
  15. 		canParse.put(Long.TYPE, s -> {try {Long.parseLong(s); return true;} catch(Exception e) {return false;}});
  16. 	};
  17. 	public static void main (String[] args) throws java.lang.Exception
  18. 	{
  19. 		if (canParse.get(Integer.TYPE).test("hello")) {
  20. 			System.out.println("Can parse hello");
  21. 		} else {
  22. 			System.out.println("Cannot parse hello");
  23. 		}
  24. 		if (canParse.get(Long.TYPE).test("1234567890123")) {
  25. 			System.out.println("Can parse 1234567890123");
  26. 		} else {
  27. 			System.out.println("Cannot parse 1234567890123");
  28. 		}
  29. 	}
  30. }
Success #stdin #stdout 0.09s 711168KB
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Standard input is empty
stdout
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Cannot parse hello
Can parse 1234567890123
https://ideone.com/9TIFND
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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