How find data type of premtive variable in java

Question

How get premtive variable data type in print statment . tell method that tell about data type of variable?

Answer 1

If you are invoking a method like

System.out.printf("%d", 5);

then System.out.printf doesn't actually receive a primitive argument: the variadic parameter is of type Object[], so the 5 will be autoboxed to Integer in this case.

However, there is no token listed in the formatter syntax documentation which will print the parameter's type in the string.

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You can write overloaded methods which are specialized for each of the primitive types:

String typeName(boolean _) { return "boolean"; }
String typeName(byte _) { return "byte"; }
String typeName(short _) { return "short"; }
String typeName(int _) { return "int"; }
String typeName(long _) { return "long"; }
String typeName(float _) { return "float"; }
String typeName(double _) { return "double"; }
String typeName(char _) { return "char"; }

You can then invoke this like:

int a = 5;
float f = 4.5f;
System.out.print(typeName(a));  // outputs "int"
System.out.print(typeName(f));  // outputs "float"

Answer 2

You can't do this with primitive types, only objects.

Answer 3

You can print Wrapper Type, not primitive type. Hope this will help :

int i=5;
System.out.println(((Object)i).getClass().getName());

Answer 4

For any object x, you could print x.getClass().getName()