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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.reflect.*;
  5. import java.lang.*;
  6. import java.io.*;
  7.  
  8. /* Name of the class has to be "Main" only if the class is public. */
  9. class Ideone
  10. {
  11. 	@FunctionalInterface
  12. 	interface Converter {
  13. 		Object convert(String s);
  14. 	}
  15. 	private static Map<Class,Converter> converterForClass = new HashMap<>();
  16. 	static {
  17. 		converterForClass.put(Integer.TYPE, s -> Integer.parseInt(s));
  18. 		converterForClass.put(Double.TYPE, s -> Double.parseDouble(s));
  19. 		converterForClass.put(String.class, s -> s);
  20. 		converterForClass.put(Long.TYPE, s -> Long.parseLong(s));
  21. 	};
  22.  
  23. 	static class Demo {
  24. 		public int a;
  25. 		public long b;
  26. 		public String c;
  27. 		public double d;
  28. 		@Override
  29. 		public String toString() {
  30. 			return a+":"+b+":'"+c+"':"+d;
  31. 		}
  32. 	}
  33.  
  34. 	public static void main (String[] args) throws java.lang.Exception
  35. 	{
  36. 		Object a = new Demo();
  37. 		Map<String,String> data = new HashMap<>();
  38. 		data.put("a", "123");
  39. 		data.put("b", "123456678789898");
  40. 		data.put("c", "HELLO");
  41. 		data.put("d", "123.456");
  42. 		for (Field f : Demo.class.getDeclaredFields()) {
  43. 			f.setAccessible(true);
  44. 			String str = data.get(f.getName());
  45. 			Object r = converterForClass.get(f.getType()).convert(str);
  46. 			f.set(a, r);
  47. 		}
  48. 		System.out.println(a);
  49. 	}
  50. }
Success #stdin #stdout 0.21s 320704KB
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123:123456678789898:'HELLO':123.456
https://ideone.com/LG1FQJ
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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