C#Interface

public interface ITransactions{   
// 接口成员   
void showTransaction();   
double getAmount();
}

using System.Collections.Generic;using System.Linq;
using System.Text;using System;namespace InterfaceApplication{  
public interface ITransactions   {      
// interface members      
void showTransaction();      
double getAmount();   
}     
public class Transaction : ITransactions   {      
private string tCode;      
private string date;      
private double amount;      
public Transaction()      {         
tCode = " ";         
date = " ";         
amount = 0.0;      
}            
public Transaction(string c,string d, double a)      {         
tCode = c;         
date = d;         
amount = a;      
}            
public double getAmount()      {         
return amount;      }            
public void showTransaction()      
{         
Console.WriteLine("Transaction: {0}", tCode);         
Console.WriteLine("Date: {0}", date);         
Console.WriteLine("Amount: {0}", getAmount());      
}   
}   
class Tester   {      
static void Main(string[] args)      
{         
Transaction t1 = new Transaction("001", "8/10/2012", 78900.00);        
Transaction t2 = new Transaction("002", "9/10/2012", 451900.00);         
t1.showTransaction();         
t2.showTransaction();         
Console.ReadKey();      
}   
}
}

Transaction: 001Date: 8/10/2012Amount: 78900Transaction: 002Date: 9/10/2012Amount: 451900