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
}
}
嗨，我想从我的TryAnother方法中的getInputArray方法开始重复，我尝试使用do-while循环进行此操作，但它说cred1在do while循环中未定义，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到达
如果do-while循环工作，那么输出应该是这样的
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？ （否）：确定
谁能建议一种做do-while循环的方法？
先感谢您
我已经编辑了代码，由于某种原因当我输入no时它正在执行重复部分，该过程不会终止
就像是：
请输入发行人ID：321321
请输入帐号：654654654
输入的完整号码：
3213 2165 4654 6549
请输入尺寸：7
请输入发行人ID：789789
信用卡号码0：
7897 8985 6852 9257
信用卡号码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):
如您所见，当我输入no时，请重复输入相同的句子，然后输入数组大小的句子
我怎样才能做到这一点？
最佳答案
我不确定您期望该程序的输出是什么。由于您询问了编译错误，因此我已经编辑了代码并删除了两个编译错误。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)
在TryAnother()方法中，已将return true语句放在if块的旁边，但在do-while循环之前。这将给您带来无法到达的语句编译错误，因为在方法中执行return语句后不再执行任何操作。因此，您必须将return true语句放在do-while循环之后。
这是更正的代码。
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;
}
}
关于java - 重复方法，同时回答是，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/13438153/