public class iComputer {

  public static void main(String[] args) {

    // Create all the parts.

    iPowerSupply PowerSupply = new iPowerSupply(120);	// 120 Volts A/C
    iCase Case = new iCase(iCase.MiniTower);		// minitower case
    iVideoCard VideoCard1 = new iVideoCard(4, "4 MB XVGA");	// video card w/ 4 MB of memory
    System.out.println("Computer: VideoCard1 occupies slot " + VideoCard1.getSlot());
    iVideoCard VideoCard2 = new iVideoCard(2, "2 MB Card");	// video card w/ 2 MB of memory
    System.out.println("Computer: VideoCard2 occupies slot " + VideoCard2.getSlot());
    iDiskController Controller1 = new iDiskController(3, "SCSI"); // up to 3 drives possible
    System.out.println("Computer: Controller1 occupies slot " + Controller1.getSlot());
    iDiskDrive Disk1 = new iDiskDrive();		// 1GB disk drive
    iDiskDrive Disk2 = new iDiskDrive(8192, "8 GB Big Disk");	// 8 GB disk drive
    iCDROM Disk3 = new iCDROM(650, "CD-ROM Drive");
    iCDROM Disk4 = new iCDROM(17000, "DVD Drive");

    // Perform some sanity checks.

    if (VideoCard1.getSlot() == VideoCard2.getSlot()) {
      System.out.println("Computer: Assertion # 1 fails!");
    }
    if (VideoCard1.slotNumber == VideoCard2.slotNumber) {
      System.out.println("Computer: Assertion # 2 fails!");
    }
    if (VideoCard1.nextSlot != VideoCard2.nextSlot) {
      System.out.println("Computer: Assertion # 3 fails!");
    }

    iCPU CPU = new iCPU(400);	// 400 MHz CPU
    System.out.println("Computer: CPU speed = " + CPU.clockSpeed);

    // Power it all up & initialize appropriately.

    PowerSupply.PowerUp();
    VideoCard1.PowerUp();
    VideoCard2.PowerUp();
    Controller1.PowerUp();
    Disk1.PowerUp();
    Disk1.formatDevice();
    System.out.println("Computer: Disk 1 capacity = " + Disk1.getCapacity() + "MB");
    System.out.println("Computer: Disk 1 type = " + Disk1.diskType);
    Disk2.PowerUp();
    Disk2.formatDevice();
    System.out.println("Computer: Disk 2 capacity = " + Disk2.getCapacity() + "MB");
    System.out.println("Computer: Disk 2 type = " + Disk2.diskType);
    Disk3.PowerUp();
    Disk3.formatDevice();
    System.out.println("Computer: Disk 3 capacity = " + Disk3.getCapacity() + "MB");
    System.out.println("Computer: Disk 3 type = " + Disk3.diskType);
    Disk4.PowerUp();
    Disk4.formatDevice();
    System.out.println("Computer: Disk 4 capacity = " + Disk4.getCapacity() + "MB");
    System.out.println("Computer: Disk 4 type = " + Disk4.diskType);
    if (!Controller1.connectDrive(Disk1)) {
      System.out.println("Computer: Assertion # 4 failed!");
    }
    if (!Controller1.connectDrive(Disk2)) {
      System.out.println("Computer: Assertion # 5 failed!");
    }
    if (!Controller1.connectDrive(Disk3)) {
      System.out.println("Computer: Assertion # 6 failed!");
    }
    if (Controller1.connectDrive(Disk4)) {
      System.out.println("Computer: Assertion # 7 failed!");
    }
  }
}