获得Java类属于哪个包的代码

import java.util.ArrayList;
import java.util.Vector;
/**
 * Main.java
 *
 * @author outofmemory.cn
 */
public class Main {

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

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

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

    }

    /**
     * 打印对象属于哪个包
     *
     * @param testObject The object
     */
    public void findPackage(Object testObject) {

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

    }

    /**
     * 启动应用程序
     *
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        new Main();
    }
}