线程中的异常＆＃34; main＆＃34; java.lang.Error：未解决的编译问题： 类型数据库中的add（BankAccount）方法不适用于BankAccount.TestBankAccount.main（TestBankAccount.java:92）中的参数（void）
第92行是在案例3下说db.add的地方。（。add作为错误加下划线）
package BankAccount;
import java.text.DateFormat;
import java.util.Date;
import java.text.NumberFormat;
import javax.swing.JOptionPane;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import java.util.ArrayList;
public class TestBankAccount
{
public static void main(String args[])
{
Database db = new Database(); // Creating database for active accounts
Database close = new Database(); // Creating database for inactive accounts
DateFormat Df = DateFormat.getDateInstance(DateFormat.LONG);
Date now = new Date();
NumberFormat nf = NumberFormat.getCurrencyInstance();
boolean done = false;
while (!done)
{
int menu = GetData.getInt("\tUnited Bank of Java\n" + "\t" + Df.format(now) + "\n"
+ "\nPlease Choose From the Following:" + "\n1. Create New Account\n2. Update Existing Account Account "+ "\n3. Close an Account\n4. View Account Information\n5. Exit");
switch(menu)
{
case 1: //Creating a BankAccount object and storing it in the database
// Creating Name object
String f = GetData.getString("Enter First Name") ;
String l = GetData.getString("Enter Last Name") ;
Name n = new Name(f,l);
// Creating Address object
String str = GetData.getString("Enter Street Name") ;
String city = GetData.getString("Enter City") ;
String st = GetData.getString("Enter State") ;
String zip = GetData.getString("Enter Zip") ;
// Creating Customer object
Address addr = new Address(str,city,st,zip);
String accNo = GetData.getString("Enter Account Number") ;
Customer c = new Customer(n,accNo,addr);
// Creating BankAccount object
double amount = GetData.getDouble("Enter First Deposit") ;
BankAccount ba = new BankAccount(c, amount);
// Add BankAccount object to the database
db.add(ba);
break;
case 2: //Update Account
accNo = GetData.getString("Enter Account Number of Account you'd like to update") ;
db.search(accNo);
if (!db.inList())
JOptionPane.showMessageDialog(null, "Account not found.");
else
{
int option = GetData.getInt("Would you like to (1) Deposit, (2) Withdraw");
switch(option)
{
case 1:
double amt = GetData.getDouble("Enter amount you'd like to deposit");
BankAccount b = db.getAccount();
b.deposit(amt);
break;
case 2:
double amnt = GetData.getDouble("Enter amount you'd like to withdraw") ;
BankAccount bnk = db.getAccount();
if (!bnk.isSufficient(amnt))
JOptionPane.showMessageDialog(null, "Insufficient funds, withdrawal cannot be done.");
else
bnk.withdraw(amnt);
break;
default:
JOptionPane.showMessageDialog(null, "Invalid selection. To return to main menu, please deposit or withdraw $0");
break;
}
}
break;
case 3: //Close Account
accNo = GetData.getString("Cose account - Please enter Account No.)");
db.search(accNo);
if (!db.inList())
JOptionPane.showMessageDialog(null, "Account not found.");
else
{
BankAccount b = db.getAccount();
int index = db.getIndex();
db.add( db.delete(index) );
JOptionPane.showMessageDialog(null, "The Account " + accNo + " has been closed.");
}
break;
case 4: //View Account
int view = GetData.getInt("What information would you like to view?\n1. Single account\n2. All active accounts\n3. All inactive accounts\n");
switch(view)
{
case 1: // View a single account
accNo = GetData.getString("View – account. Please enter Account No.");
db.search(accNo);
if(!db.inList())
JOptionPane.showMessageDialog(null, "Account not found.");
else
{
BankAccount bb = db.getAccount();
String s = "Customer\t" + bb.getCustomer().getName().getFirst() + "\t" + bb.getAmount() ;
JOptionPane.showMessageDialog(null, s, "Bank Account " + bb.getCustomer().getAccountNumber(), JOptionPane.INFORMATION_MESSAGE);
}
break;
case 2: // View all active accounts
ArrayList list = db.getList();
if(list.isEmpty())
JOptionPane.showMessageDialog(null, "List is empty");
else
{
int i = 0, length = db.getSize();
String s = "";
while(i < length)
{
BankAccount b = (BankAccount)list.get(i);
s = s + "Customer Name: " + b.getCustomer().getName().getFirst() + " " + b.getCustomer().getName().getLast() + "\nAccount number: " + b.getCustomer().getAccountNumber() + "\n"
+ b.getCustomer().getAddress().getStreet() + ", " + b.getCustomer().getAddress().getCity() + ", " + b.getCustomer().getAddress().getState() + ", "
+ b.getCustomer().getAddress().getZip() + "\n" + nf.format(b.getAmount()) +
"\n";
i++;
}
display(s, "Active Accounts", JOptionPane.INFORMATION_MESSAGE);
}
break;
case 3: // View all closed accounts
ArrayList closed = db.getList();
if(closed.isEmpty())
JOptionPane.showMessageDialog(null, "List is empty");
else
{
int i = 0, length = db.getSize();
String s = "";
while(i < length)
{
BankAccount b = (BankAccount)closed.get(i);
s = s + "Name " + b.getCustomer().getName().getFirst() + " " + b.getCustomer().getName().getLast() + "\tAccount number: " + b.getCustomer().getAccountNumber() + "\n";
i++;
}
display(s, "Closed Accounts", JOptionPane.INFORMATION_MESSAGE);
}
break;
default:
JOptionPane.showMessageDialog(null, "Invalid option.");
break;
}// End view
break;
case 5: //Exit
done = true;
break;
default:
JOptionPane.showMessageDialog(null, "Account not found.");
break;
}
}
}
static void display(String s, String heading, int MESSAGE_TYPE)
{
JTextArea text = new JTextArea(s, 20, 30);
JScrollPane pane = new JScrollPane(text);
JOptionPane.showMessageDialog(null, pane, heading, MESSAGE_TYPE);
}
}
package BankAccount;
import java.util.ArrayList;
import java.util.Scanner;
class Database
{
ArrayList<BankAccount> list;
BankAccount ba;
int index;
boolean found;
Database()
{
list = new ArrayList<BankAccount>();
}
void search(String key)
{
found = false;
int i = 0;
while(!found && i < list.size())
{
BankAccount b = list.get(i);
if(b.getCustomer().getAccountNumber().equalsIgnoreCase(key))
{
ba = b;
found = true;
index =i;
}
else
i++;
}
}
void add(BankAccount b) { list.add(b); }
void delete(int i) { list.remove(i); }
int getIndex(){ return index; }
boolean inList(){ return found; }
BankAccount getAccount() { return ba; }
boolean isInList() { return found; }
int size() { return list.size(); }
boolean isEmpty() { return list.isEmpty(); }
public ArrayList getList() {
Scanner readBoard = new Scanner(System.in);
return null;
}
public int getSize() {
Scanner readBoard = new Scanner(System.in);
return 0;
}
}
答案 0 :(得分：3)
嗯，这是你的Database班级
class Database {
...
void add(BankAccount b) { list.add(b); }
void delete(int i) { list.remove(i); }
...
}
显然这样做
Database db = new Database();
...
db.add( db.delete(index) );
没有任何意义，您实际上是在尝试将void作为参数传递给等待BankAccount类型的方法