在我的方法中,我希望用户输入是否首先通过而需要进入第二个while循环,如果条件失败则需要重新运行循环,而不是重新运行本身,而是在第一次运行时执行。
//Method to read, validate and store postcode and purchase amount for N customers
public void addRecord(int customerCounter) throws IOException
{
int postcode;
double purchaseAmount;
int conform =0;
do{
BufferedReader breader= new BufferedReader(new InputStreamReader(System.in));
System.out.print("Postcode: ");
postcode= Integer.parseInt(breader.readLine());
if(4121 >postcode)
{
System.out.print("Postcode must be greater than 4121");
System.out.print("Try again: ");
}
else if(postcode > 4123)
{
System.out.print("Postcode must be less than 4123");
System.out.print("Try again: ");
}
else
{
conform = 1;
//System.out.println(conform);
}
}
while(4121 >postcode && postcode > 4123);
if(conform == 1)
{
System.out.println(conform);
do
{
BufferedReader breader2= new BufferedReader(new InputStreamReader(System.in));
breader2= new BufferedReader(new InputStreamReader(System.in));
System.out.println("Purchase Amount: ");
purchaseAmount= Double.parseDouble(breader2.readLine());
if(purchaseAmount < 60)
{
System.out.print("Purchase Amount must be greater than $60");
System.out.print("Try again: ");
continue;
}
else if(purchaseAmount > 500)
{
System.out.print("Purchase Amount must be greater than $500");
System.out.print("Try again: ");
}
}
while(purchaseAmount < 60 && purchaseAmount > 500);
}
}
最佳答案
您在while
中的条件是错误的,它们总是错误的
postcode = 5000;
while(postcode < 4121 && postcode > 4123); -> while(false && true); -> false
postcode = 3000;
while(postcode < 4121 && postcode > 4123); -> while(true && false); -> false
使用OR代替AND
while(postcode < 4121 || postcode > 4123);
同样是第二次。
第一个while的第二次执行可能是因为您再次调用
addRecord
。