bank.java

基本实现银行存取款功能

package biz;            
import entity.Account;
import entity.CreditAccount;
import entity.SavingAccount;

public class Bank implements IBank{  
    private Account[]  accounts=new Account[10];
    private int index=0;
    private void expand(){  
    	Account[]  as=new Account[accounts.length*2];
    	System.arraycopy(accounts,0,as,0,accounts.length);
    	accounts=as;
    }    
    public long regist(String name,String password,String againPassword,String personId,int type){
         if(password.equals(againPassword)){  
         	Account a=null;
         	 if(type==0){
         	 	a=new SavingAccount(name,password,personId); 
         	}
         	if(type==1){   
         		a=new CreditAccount(name,password,personId);
         	} 
         	if(index>=accounts.length){ 
         		  expand();
         	} 
         	accounts[index]=a;
         	index++;   
         	return a.getId();
        }else{  
        	//System.out.println("Sorry,password not same!");
        	return -1;
        }
    } 
    public long login(long id,String password){      
    	// 根据id查找帐户，获取该帐户的password  
    	Account a=queryById(id);
    	if(a==null){     
    		System.out.println("Sorry,Account not exist");
    		return -1;
    	}        
    	String password1=a.getPassword();
    	// 判断两个password是否相等  
    	if(password1.equals(password)){ 
    		return id;
    	}     
    	//System.out.println("Sorry , Password not correct");
    	return -1;
    }      
    public void save(long id,double money){  
    	//  根据id查找帐户
    	Account a=queryById(id);
    	if(a==null){     
    		System.out.println("Sorry,Account not exist");
    	} else{ 
    		 a.deposit(money);
    	} 	
    }  
    public void withdraw(long id,double money){  
    	  //  根据id查找帐户   
    	 Account a=queryById(id);
    	if(a==null){     
    		System.out.println("Sorry,Account not exist");
    	} else{ 
    		a.withdraw(money);
    	}  
    }
    public double queryBalance(long id){ 
    	//  根据id查找帐户   
    	Account a=queryById(id);
    	 if(a==null){     
    		System.out.println("Sorry,Account not exist");
    		return -1;
    	}else{         
    		return a.getBalance();
    	} 
    }   
    private Account queryById(long id){   
    	for(int i=0;i<index;i++){     
    		long lid=accounts[i].getId(); 
    		if(id==lid)  return accounts[i];
    	}   
    	return null;
    }   
    public static void main(String[] args){
    	 Bank bank=new Bank();
    	 bank.regist("huxz","12345","12345","1111111",0); 
    	 bank.login(10001,"1234");
    	 bank.save(10001,5000);
    	 System.out.println(bank.queryBalance(10001)); 
    	 bank.withdraw(10002,3000);
    }   
}