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

+1 for SOME_MAGIC_HERE(s) :D IT WAS AUTOMAGIC! Always nice to get a good laugh! — Ryan Amos
– Ryan Amos, Commented Mar 11, 2012 at 16:04

aioobe · Accepted Answer · 2012-03-11 16:07:50Z

12

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"

edited Mar 11, 2012 at 16:07

answered Mar 11, 2012 at 16:01

aioobe

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1 Comment

Ryan Amos Over a year ago

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

Sabya · Accepted Answer · 2012-03-11 16:24:29Z

1

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

answered Mar 11, 2012 at 16:24

Sabya

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