Question

该程序允许用户创建多个客户端。如何允许数组等于所有这些输入？当我显示数组时，唯一显示的是添加的最后一个客户端。

static String [] clients = new String[100];

void getClient()
    {
        String input = new String (" ");
        for(int i = 0; i < ccount; i++)
            clients[i] = input;
        {
        input = JOptionPane.showInputDialog("Enter client ID: ");
            while(checkClientID(input) == false)
            {   
                input = JOptionPane.showInputDialog("Invalid! Only 9 digits allowed. Re-enter client ID: ");
            }//end while
        clientID = input;
        input = JOptionPane.showInputDialog("Enter client name: ");
            while(checkCname(input) == false)
            {   
                input = JOptionPane.showInputDialog("Invalid! Only 50 alphabetical characters allowed! Re-enter client name: ");
            }//end while
        cname = input;
        input = JOptionPane.showInputDialog("Enter client address: ");
        caddress = input;
        input = JOptionPane.showInputDialog("Enter client email: ");
            while(checkCemail(input) == false)
            {   
                input = JOptionPane.showInputDialog("Invalid! Must enter at least  one character before @ and .com at end, Re-enter email: ");
            }//end while 
        cemail = input;
        input = JOptionPane.showInputDialog("Enter monthly service fees: ");
            while(checkCfees(input) == false)
            {   
                input = JOptionPane.showInputDialog("Invalid! Must enter real number with two decimal places, Re-enter monthly service fees: ");
            }//end while
        cfees = input;
        input = JOptionPane.showInputDialog("Enter Employee ID assigned to client: ");
        while(checkEmpID(input) == false)
        {   
            input = JOptionPane.showInputDialog("Invalid! Only 9 digits allowed. Re-enter employee ID: ");
        }//end while
        cempID = input;
        mainMenu();
        }//end for 
    }//end getClient

Answer 1

使用ArrayList：

首先，声明ArrayList的ArrayList：

static ArrayList<ArrayList> clients = new ArrayList<>();

每次调用函数getCliente()时，客户都会添加到列表中：

public static void getCliente() {                
    String input;                
    clients.add(new ArrayList<>());
    int i=clients.size()-1;

    input = JOptionPane.showInputDialog("Enter client ID: ");
        while(checkClientID(input) == false)
        {   
            input = JOptionPane.showInputDialog("Invalid! Only 9 digits allowed. Re-enter client ID: ");
        }//end while
    clientID = input;
    clients.get(i).add(clientID);
    input = JOptionPane.showInputDialog("Enter client name: ");
        while(checkCname(input) == false)
        {   
            input = JOptionPane.showInputDialog("Invalid! Only 50 alphabetical characters allowed! Re-enter client name: ");
        }//end while
    cname = input;
    clients.get(i).add(cname);
    input = JOptionPane.showInputDialog("Enter client address: ");
    caddress = input;
    input = JOptionPane.showInputDialog("Enter client email: ");
        while(checkCemail(input) == false)
        {   
            input = JOptionPane.showInputDialog("Invalid! Must enter at least  one character before @ and .com at end, Re-enter email: ");
        }//end while 
    cemail = input;
    clients.get(i).add(cemail);
    input = JOptionPane.showInputDialog("Enter monthly service fees: ");
        while(checkCfees(input) == false)
        {   
            input = JOptionPane.showInputDialog("Invalid! Must enter real number with two decimal places, Re-enter monthly service fees: ");
        }//end while
    cfees = Double.parseDouble(input);
    clients.get(i).add(cfees);
    input = JOptionPane.showInputDialog("Enter Employee ID assigned to client: ");
    while(checkEmpID(input) == false)
    {   
        input = JOptionPane.showInputDialog("Invalid! Only 9 digits allowed. Re-enter employee ID: ");
    }//end while
    cempID = input;
    clients.get(i).add(cempID);
    //mainMenu();      
}

要迭代并打印列表，我们使用此函数：

public static void printClients() {
    for (ArrayList client: clients) {
        System.out.println("Client ID: " + client.get(0));
        System.out.println("Client name: " + client.get(1));
        System.out.println("Client address: " + client.get(2));
        System.out.println("Client email: " + client.get(3));
        System.out.println("Monthly service fees: " + client.get(4));
        System.out.println("Employee ID assigned to client: " + client.get(5));
        System.out.println("--------------------------------------------------");
    }
}

如何设置一个等于所有这些输入的数组？

1 个答案: