Find the Package of an Object - A Java Code Example

This example shows how to determine the package of an object. To get the package name we need to call the getClass() method of the object to get a reference to the object class.
Then we can call the getPackage() method that will return an object of type Package. Finally we call the getName() method on the Package object which returns a String containing the package name.

import java.util.ArrayList;
import java.util.Vector;
/**
* Main.java
*
* @author www.javadb.com
*/
public class Main {

    /**
     * Constructor
     */
    public Main() {

        findPackage(new Vector());
        findPackage(new ArrayList());

        findPackage("Test String");
        findPackage(new Integer(1));

    }

    /**
     * Checks which package the object has.
     *
     * @param testObject The object
     */
    public void findPackage(Object testObject) {

        System.out.println("Object has the package " + testObject.getClass().getPackage().getName());

    }

    /**
     * Starts the program
     *
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        new Main();
    }
}

This code will result in the following output:

Object has the package java.util
Object has the package java.util
Object has the package java.lang
Object has the package java.lang

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