Test.java

package Practice;

public class Test {
    public static void main( String[] args ) {
        Box box1 = new Box(10, 5, 2);
        System.out.println( box1.getVolume() );

        Box box2 = new Box(7, 3, 2);
        System.out.println( box2.getVolume() );

        Box box3 = new Box();
        System.out.println( box3.getVolume() );

        Box box4 = new Box(10);
        System.out.println( box4.getVolume() );
    }
}