Java: Get the class of a variable

Question

For debugging purposes, I would like to display the type of a specific variable in Java, e.g.:

String s = "adasdas";
System.out.println( SOME_MAGIC_HERE(s) );

And get:

String

• Ryan Amos: +1 for SOME_MAGIC_HERE(s) :D IT WAS AUTOMAGIC! Always nice to get a good laugh!

Answer 1

You're looking for the Object.getClass() method.

Examples:

System.out.println(s.getClass()); // Prints "java.lang.String"
System.out.println(s.getClass().getSimpleName()); // Prints "String"

• Ryan Amos: Class of an object: s.getClass() Class of a class: String.class Name of a class: clazz.getName()

Answer 2

The following code will show the canonical name of the class and the Simple name of the class.

package com.personal.sof;
public class GetClassOfVariable {
 public static void main(String[] args) {
 String strVar = "Hello World";
 System.out.println(strVar.getClass().getCanonicalName());
 System.out.println(strVar.getClass().getSimpleName());
 }
}

o/p :

java.lang.String
String