Definition and application of method

 

 // 1. Define its properties and methods 
    public int id;
    public String userName;
    public int password;
    public String packageConsumptionName;
    public double monthlyConsumption;
    public double accountBalance;
    public double callDuration;
    public int  textingNumber;
    public double netFlow;

    public void showCard(){
        System.out.println(" The card number is ："+id);
        System.out.println(" The user is called ："+userName);
        System.out.println(" The password for ："+password);
        System.out.println(" The name of the package is ："+packageConsumptionName);
        System.out.println(" The consumption amount of the current month is ："+monthlyConsumption);
        System.out.println(" The account balance is ："+accountBalance);
        System.out.println(" The actual call duration is ："+callDuration);
        System.out.println(" The actual number of text messages sent is ："+textingNumber);
        System.out.println(" The actual Internet traffic is ："+netFlow);
    }