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  1. import java.lang.reflect.Field;
  2. import java.util.HashMap;
  3. import java.util.Map;
  4.  
  5. class CarFiller {
  6.  
  7. 	public static void main(String[] args) throws Exception {
  8. 		Map<String, String> data = new HashMap<>();
  9. 		data.put("name", "BMW");
  10. 		data.put("year", "2018");
  11. 		data.put("type", "TWO");
  12.  
  13. 		Car car = new Car();
  14. 		fillField(car, "name", data);
  15. 		fillField(car, "year", data);
  16. 		fillField(car, "type", data);
  17.  
  18. 		System.out.println(car);
  19. 	}
  20.  
  21. 	private static void fillField(Object instance, String fieldName, Map<String, String> data) throws Exception {
  22. 		Field field = instance.getClass().getDeclaredField(fieldName);
  23. 		field.setAccessible(true);
  24.  
  25. 		String value = data.get(fieldName);
  26. 		Object typedValue = null;
  27. 		final Class<?> type = field.getType();
  28. 		if (int.class.isAssignableFrom(type)) {
  29. 			typedValue = Integer.parseInt(value);
  30. 		} else if (type.isEnum()) {
  31. 			typedValue = Enum.valueOf((Class<Enum>) type, value);
  32. 		} else {
  33. 			// Assume String
  34. 			typedValue = value;
  35. 		}
  36.  
  37. 		field.set(instance, typedValue);
  38. 	}
  39.  
  40. 	enum  Type {
  41. 	    ONE, TWO
  42. 	}
  43.  
  44. 	static class Car {
  45. 		private String name;
  46. 	    private int year;
  47. 	    private Type type;
  48.  
  49. 		public void setName(String name) {
  50. 			this.name = name;
  51. 		}
  52. 		public void setYear(int year) {
  53. 			this.year = year;
  54. 		}
  55. 		public void setType(Type type) {
  56. 			this.type = type;
  57. 		}
  58.  
  59. 	    @Override
  60. 		public String toString() {
  61. 			return "Car [name=" + name + ", year=" + year + ", type=" + type + "]";
  62. 		}		
  63. 	}
  64. }
  65.  
Success #stdin #stdout 0.05s 2184192KB
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Car [name=BMW, year=2018, type=TWO]
https://ideone.com/5zVnZP
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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