java集合練習

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import java.util.ArrayList;import java.util.List;public class Bank{    private List<Customer> customers;             //customers集合    private int numberOfCustomers;                //記錄客戶數量    public Bank(){                                //構造方法，初始化customers        customers=new ArrayList<Customer>();    }    public void addCustomer(String f,String l){        //方法：往customers裡面添加Customer對象        Customer p=new Customer(f,l);        customers.add(p);    }    public int getNumOfCustomers(){                   //擷取客戶數量，即擷取customers的長度        numberOfCustomers=customers.size();        return numberOfCustomers;    }    public Customer getCustomer(int index){            //根據索引取值return customers.get(index); 
　　}
 }

public class TestBanking {    public static void main(String[] args) {        Bank cus=new Bank(){};        cus.addCustomer("Simms", "Jane");        cus.addCustomer("Bryant", "Owen");        cus.addCustomer("Soley","Tim");        cus.addCustomer("Soley","Maria");        for(int i=0;i<cus.getNumOfCustomers();i++){            System.out.println("Customer "+(i+1)+" is"+" "+cus.getCustomer(i));        }            System.out.println("當前客戶數量="+cus.getNumOfCustomers());        System.out.println("第二個客戶是："+cus.getCustomer(2));    }}

public class Customer {    //聲明私人屬性    private String firstName;    private String lastName;    private Account account;    //聲明構造器    Customer(){};    Customer(String f,String l){        this.firstName=f;        this.lastName=l;    }    //聲明存取器getter/setter方法    public String getFirstName() {                    //firstName        return firstName;    }    public void setFirstName(String firstName) {        this.firstName = firstName;    }    public String getLastName() {                    //lastName        return lastName;    }    public void setLastName(String lastName) {        this.lastName = lastName;    }    //存取器getter/setter方法——account    public Account getAccount() {        return account;    }    public void setAccount(Account acct) {        this.account=acct;    }    @Override    public String toString() {        return firstName + "," + lastName;    }}

java集合練習