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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.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		int intVal = 3;
  13. 		long longVal = 2;
  14. 		double doubleVal = 3.6d;
  15. 		float floatVal = 5.3f;
  16. 		Integer valInt = 5;
  17. 		Long valLong = 68l;
  18. 		Double valDouble = 23.5;
  19. 		Float valFloat = 34.7f;
  20. 		String valString = "Teste";
  21. 		MyClass valMyClass = new MyClass();
  22. 		Object valObj = new Object();
  23. 		char charVal = 222; /* adicionado conforme comentário de @Piovezan */
  24. 		Character valChar = 222; /* adicionado conforme comentário de @Piovezan */
  25. 		boolean booleanVal = true; /* adicionado conforme comentário de @Piovezan */
  26. 		Boolean valBoolean = false; /* adicionado conforme comentário de @Piovezan */
  27. 		printIsNumber(intVal);
  28. 		printIsNumber(longVal);
  29. 		printIsNumber(doubleVal);
  30. 		printIsNumber(floatVal);
  31. 		printIsNumber(valInt);
  32. 		printIsNumber(valLong);
  33. 		printIsNumber(valDouble);
  34. 		printIsNumber(valFloat);
  35. 		printIsNumber(valString);
  36. 		printIsNumber(valMyClass);
  37. 		printIsNumber(valObj);
  38. 		printIsNumber(charVal); /* adicionado conforme comentário de @Piovezan */
  39. 		printIsNumber(valChar); /* adicionado conforme comentário de @Piovezan */
  40. 		printIsNumber(booleanVal); /* adicionado conforme comentário de @Piovezan */
  41. 		printIsNumber(valBoolean); /* adicionado conforme comentário de @Piovezan */
  42. 	}
  43.  
  44. 	public static void printIsNumber(Object value){
  45. 		System.out.println(value.getClass() + ", val: " + value + " is number: " + isNumber(value));
  46. 	}
  47.  
  48. 	public static boolean isNumber(Object value){
  49. 		return (value instanceof Number /* adicionado conforme comentário de @Piovezan */|| value instanceof Character);
  50. 	}
  51.  
  52. 	public static class MyClass{
  53.  
  54. 	}
  55. }
Success #stdin #stdout 0.1s 320576KB
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Standard input is empty
stdout
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class java.lang.Integer, val: 3 is number: true
class java.lang.Long, val: 2 is number: true
class java.lang.Double, val: 3.6 is number: true
class java.lang.Float, val: 5.3 is number: true
class java.lang.Integer, val: 5 is number: true
class java.lang.Long, val: 68 is number: true
class java.lang.Double, val: 23.5 is number: true
class java.lang.Float, val: 34.7 is number: true
class java.lang.String, val: Teste is number: false
class Ideone$MyClass, val: Ideone$MyClass@52e922 is number: false
class java.lang.Object, val: java.lang.Object@25154f is number: false
class java.lang.Character, val: Þ is number: true
class java.lang.Character, val: Þ is number: true
class java.lang.Boolean, val: true is number: false
class java.lang.Boolean, val: false is number: false
https://ideone.com/NLXxNv
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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