回答是，重复方法

时间：2012-11-18 07:00:54

标签： java arrays object repeat do-while 

package homework4;
import java.util.Scanner;
public class Prog4 {
static Scanner scanner = new Scanner(System.in);
public static void main(String[] args)
{   CreditCardNumber[] cred1;
    CreditCardNumber cred2 = getInput();
    Display("The complete number from your input:", cred2);
    cred1 = getInputArray();
    DisplayArray(cred1);
    TryAnother(cred1);
}

public static CreditCardNumber getInput() {
    String ID;
    String accNum;
    CreditCardNumber tempCred;      
    System.out.printf("Please enter issuer ID:");
    ID = scanner.next();
    System.out.printf("Please enter account number:");
    accNum = scanner.next();
    tempCred = new CreditCardNumber(ID, accNum);

    return tempCred;
}
public static void Display(String ch, CreditCardNumber cred2)
{

    System.out.println(ch);
    System.out.println(cred2.toString().replaceAll(".{4}", "$0   "));       
}

public static CreditCardNumber[] getInputArray()
{
    CreditCardNumber[] tempArray;
    String tempID;
    int size;       
    System.out.printf("Please enter size of the aray:");
    size = scanner.nextInt();
    if(size < 1)
    {
        size = 1;
    }
    tempArray = new CreditCardNumber[size];
    System.out.printf("Please enter issuer ID:");
    tempID = scanner.next();
    for(int i = 0; i < tempArray.length; i++)
    {
        tempArray[i] = new CreditCardNumber();
        tempArray[i].CreateCred(tempID);
    }

    return tempArray;
}

public static void DisplayArray(CreditCardNumber[] cred1)
{
    for(int i = 0; i< cred1.length; i++)
    {
        Display("Credit Card # " + i+":" + '\n', cred1[i]);
    }
    System.out.println();
}

public static boolean TryAnother(CreditCardNumber[] cred1)   // pass cred1 as a parameter
{
    String s;
    System.out.printf("Get more credit card numbers? (n for no):");
    s = scanner.next();
    if(s.charAt(0) != 'N' || s.charAt(0) != 'n')
    {

        do
        {
            TryAnother(cred1);
            cred1 = getInputArray();
            DisplayArray(cred1);                
        }while(s.charAt(0) != 'N' || s.charAt(0) != 'n');       
    }
    return false;   // put the return statement here
}
}

您好我正在尝试从我的TryAnother方法中的getInputArray方法重复，我尝试使用do-while循环，但是它表示在do while循环中未定义cred1但是当我尝试为cred1创建本地对象时它给了我错误代码无法访问 这就是do-while循环工作时输出应该是什么样的

Enter a credit card issuer number: 321321
Enter an account number: 654654654
The complete number from your input: 
3213 2165 4654 6549

Enter the number of elements in the array: 7
Enter an issuer ID# (6 digits): 789789

Credit Card # 0: 
7897 8931 4062 1219

Credit Card # 1: 
7897 8920 2125 3522

Credit Card # 2: 
7897 8971 9793 0944

Credit Card # 3: 
7897 8979 3216 3090

Credit Card # 4: 
7897 8995 0461 8493

Credit Card # 5: 
7897 8948 8037 5909

Credit Card # 6: 
7897 8966 0251 9953

Get more credit card numbers? (n for no): ok

Enter the number of elements in the array: 3
Enter an issuer ID# (6 digits): 345345

Credit Card # 0: 
3453 4576 6705 1666

Credit Card # 1: 
3453 4548 1163 5684

Credit Card # 2: 
3453 4563 8807 0419

获取更多信用卡号码？ （n代表否）：确定

任何人都可以建议一种方法来做do-while循环吗？ 提前谢谢你

我已经编辑了代码，因为当我输入no进程没有终止时它正在执行重复部分

类似的东西：

请输入发行人ID：321321 请输入帐号：654654654 您输入的完整数字： 3213 2165 4654 6549
请输入aray的大小：7 请输入发行人ID：789789 信用卡＃0：

7897 8985 6852 9257
信用卡＃1：

7897 8917 0678 9958
信用卡＃2：

7897 8900 5781 0934
信用卡＃3：

7897 8949 2244 6098
信用卡＃4：

7897 8941 3828 4895
信用卡＃5：

7897 8965 9233 5006
信用卡＃6：

7897 8981 8442 5880 

Get more credit card numbers? (n for no):n
Get more credit card numbers? (n for no):n
Get more credit card numbers? (n for no):no
Get more credit card numbers? (n for no):

你可以看到当我输入no时它会继续重复相同的句子我想要的是它重复输入数组大小的句子 我怎么能这样做？

2 个答案:

答案 0 :(得分：1)

我不确定你对这个程序的输出有什么期望。由于您询问了编译错误，因此我编辑了您的代码并删除了两个编译错误。

    {li> cred1未在TryAnother()中定义。因此，您必须将其作为参数传递。像这样TryAnother(CreditCardNumber[] cred1)
  1. 在TryAnother()方法中，您已将return true语句放在if块的一侧，但在do-while循环之前。这将为您提供无法访问的语句编译错误，因为在方法中执行return语句后没有进一步执行。所以你必须在do-while循环之后放置return true语句。

    2. 这是更正后的代码。 

    import java.util.Scanner;
public class Prog4 {
    


    static Scanner scanner = new Scanner(System.in);
    


    public static void main(String[] args)
{   CreditCardNumber[] cred1;
    CreditCardNumber cred2 = getInput();
    Display("The complete number from your input:", cred2);
    cred1 = getInputArray();
    DisplayArray(cred1);
    TryAnother(cred1);         // pass variable cred1 as a parameter
}
    


    public static CreditCardNumber getInput() {
    String ID;
    String accNum;
    CreditCardNumber tempCred;
    
    System.out.printf("Please enter issuer ID:");
    ID = scanner.next();
    System.out.printf("Please enter account number:");
    accNum = scanner.next();
    tempCred = new CreditCardNumber(ID, accNum);
    return tempCred;
}
    


    public static void Display(String ch, CreditCardNumber cred2)
{
    System.out.println(ch);
    System.out.println(cred2.toString().replaceAll(".{4}", "$0   "));
    
}
    


    public static CreditCardNumber[] getInputArray()
{
    CreditCardNumber[] tempArray;
    String tempID;
    int size;
    
    System.out.printf("Please enter size of the aray:");
    size = scanner.nextInt();
    if(size < 1)
    {
        size = 1;
    }
    tempArray = new CreditCardNumber[size];
    System.out.printf("Please enter issuer ID:");
    tempID = scanner.next();
    for(int i = 0; i < tempArray.length; i++)
    {
        tempArray[i] = new CreditCardNumber();
        tempArray[i].CreateCred(tempID);
    }
    return tempArray;
}
    


    public static void DisplayArray(CreditCardNumber[] cred1)
{
    for(int i = 0; i< cred1.length; i++)
    {
        Display("Credit Card # " + i+":" + '\n', cred1[i]);
    }
    System.out.println();
}
    


    public static boolean TryAnother(CreditCardNumber[] cred1)   // pass cred1 as a parameter
{
    String s;
    System.out.printf("Get more credit card numbers? (n for no):");
    s = scanner.next();
    if(s.charAt(0) != 'N' || s.charAt(0) != 'n')
    {
        do
        {
    
            cred1 = getInputArray();
        }while(s.charAt(0) != 'N' || s.charAt(0) != 'n');
    }
    return false;   // put the return statement here
}
    


    }
    


    // A dummy class
class CreditCardNumber{
  String ID;
  String accNum;
  public CreditCardNumber(){
  }
  public CreditCardNumber(String ID,String accNum){
    this.ID = ID;
    this.accNum = accNum;
  }
  public void CreateCred(String tempID){
    ID = tempID;
  }
}

答案 1 :(得分：0)

您应该在cred1例程之外将main定义为全局静态方法。

或者将cred1作为getInputArray(...)的参数传递给TryAnother(...)，然后将{{1}}传递给{{1}}。

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