Question

这只是我整个项目的一个类文件。我检查过每一个班级，我发现这是罪魁祸首。它应该包含在另一个类中解析的城市和州（因此你留下了city = Dallas和state = TX）但是当这些参数被传递时，它们不会更新私有String状态和私人String城市。

我一直在？？作为toString方法的输出

    public class Address 
{
private String city;
private String state;

public Address()
    {
    city="?";
    state="?";
    }

public String getCity()
    {
    return city;
    }

public String getState()
    {
    return state;
    }

public void setState(String s)
    {
    //System.out.println(s);
    state=s;
    //System.out.println(state);
    }

public void setCity(String c)
    {
    city=c;
    }

public String toString()
    {
    String cityState=city+","+state;
    return cityState;
    }

}

Tester Class

    import java.io.*;
    import java.util.*;

    public class Assignment4
    {
    public static void main (String[] args)
    { // local variables, can be accessed anywhere from the main method
  char input1;
  String inputInfo = new String();
  String line = new String(), line2;
  //instantiate a Bank array
  Bank[] accounts = new Bank[10];
  Bank bank1 = null;

  Scanner scan = new Scanner(System.in);
  int index = 0;
  // print the menu
   printMenu();
   do  // will ask for user input
    {
     System.out.println("What action would you like to perform?");
     line = scan.nextLine().trim();
     input1 = line.charAt(0);
     input1 = Character.toUpperCase(input1);

     if (line.length() == 1)
      {// matches one of the case statements
       switch (input1)
        {
         case 'A':   //Add Bank
           System.out.print("Please enter the bank information:\n");
           inputInfo = scan.nextLine();
           bank1 = BankParser.bankParser(inputInfo);
           accounts[index] = bank1;
           index++;
           break;
         case 'B':   //Display banks
           for (int i=0; i< index; i++)
                    System.out.print(accounts[i].toString());
           break;
         case 'Q':   //Quit
           break;
         case '?':   //Display Menu
           printMenu();
           break;
         default:
           System.out.print("Unknown action\n");
           break;
        }
      }
     else
      {
       System.out.print("Unknown action\n");
      }
    } while (input1 != 'Q' || line.length() != 1);
  }


  /** The method printMenu displays the menu to a user**/
  public static void printMenu()
  {
   System.out.print("Choice\t\tAction\n" +
                    "------\t\t------\n" +
                    "A\t\tAdd Bank\n" +
                    "B\t\tDisplay Banks\n" +
                    "Q\t\tQuit\n" +
                    "?\t\tDisplay Help\n\n");
  }
 }

Bank.java类

    public class Bank 
    {
    Address Address=new Address();
    private String bankName;
    private String bankID;
    private Address bankAddress= new Address();

    public Bank()
{
bankName="?";
bankID="?";

}

    public String getBankName()
{
return bankName;
}

    public String getBankID()
{
return bankID;
}

    public Address getBankAddress()
{
return bankAddress;
}

    public void setBankName(String bName)
{
bankName=bName;
}

    public void setBankID(String bID)
{
bankID=bID;
}

    public void setBankAddress(String city, String state)
{
Address.setCity(city);
Address.setState(state);
}

    public String toString()
{
String bankInfo="\nBank Name:\t\t"+bankName+"\nBank ID: \t\t"+bankID+"\nBank        address:\t\t"+bankAddress+"\n\n";
return bankInfo;
}
    }

BankParser.Java类

    public class BankParser 
    {
public static Bank bankParser(String lineToParse)
{
    Bank bank=new Bank();
    String delims="[/]+";
    String[] primaryParse=lineToParse.split(delims);
    bank.setBankName(primaryParse[0]);
    bank.setBankID(primaryParse[1]);
    String[] secondaryParse=primaryParse[2].split("[,]");
    //String city=secondaryParse[0];
    //String state=secondaryParse[1];
    bank.setBankAddress(secondaryParse[0], secondaryParse[1]);
    //System.out.println(secondaryParse[1]);
    return bank;
}


    }

Answer 1

您的代码没问题。测试以下内容以说服自己：

  public static void main(String[] args) {
    Address address = new Address();
    address.setCity("Albany");
    address.setState("NY");
    System.out.println(address.toString());
  }

Answer 2

您有两个Address对象，一个名为Address，另一个名为bankAddress。您正在Address对象上设置city和state值，但返回bankAddress对象。您只需要有一个Address对象，您可以设置值并返回。

Answer 3

public void setBankAddress(String city, String state)
{
    Address.setCity(city);
    Address.setState(state);
}

这是你的问题，你可能想做

public void setBankAddress(String city, String state)
{
    bankAddress.setCity(city);
    bankAddress.setState(state);
}

代替。

两个字符串不会更新，不断返回＆＃34;？＆＃34;

3 个答案: