当程序运行时,当输入负数或字母时,catch 不会捕获错误。否则程序运行良好,其他任何事情都没有错误。当输入不正确的输入时,它只是捕获未捕获。
for (int customer=0; customer<numberOfCustomers; customer++) {
try {
// get amount used by customer as String, convert to double
GBused = Double.valueOf(Accounts[customer][USED]);
// compute bill based on the customer's plan selection
switch (Accounts[customer][SELECTION]) {
case "Plan-A":
bill = computeBill (GBused, PLAN[A][LIMIT], PLAN[A][PRICE]);
break;
case "Plan-B":
bill = computeBill (GBused, PLAN[B][LIMIT], PLAN[B][PRICE]);
break;
case "Plan-C":
bill = computeBill (GBused, PLAN[C][LIMIT], PLAN[C][PRICE]);
break;
case "Plan-D":
bill = computeBill (GBused, PLAN[D][LIMIT], PLAN[D][PRICE]);
break;
default:
bill = 0.00;
break;
}
// convert the bill to a String and save into the array
Accounts[customer][BILL] = String.valueOf(bill);
} // end of try
catch (NumberFormatException e) {
System.out.println ("Values for GB used must be numeric");
}
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