The class ‘Doubler’ is a wrapper class for the datatype double, and it has two static variables that contains the minimum and maximum values of the double datatype: MIN_VALUE and MAX_VALUE.
To find out the min and max values of the double datatype, just print them out to console like this:

/*
 * Main.java
 *
 * @author www.javabout.com
 */
public class Main {
    
    /*
     * This method displays the minimum and maximum values of the datatype double.
     */
    
    public void displayMinAndMaxValuesOfDouble() {
        
        System.out.println(Double.MIN_VALUE);
        System.out.println(Double.MAX_VALUE);
    }
    
    
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        new Main().displayMinAndMaxValuesOfDouble();
    }
}