如果輸入錯誤，我不知道如何讓程序重新啟動。我是 java 新手，不知道如何有效地使用 if 語句或循環(huán)。import java.util.Scanner; public class TuitionRates {public static void main(String[] args) { //variables String name = ""; String studentType = ""; int creditNumber = 0; double totalTF = 0.00; double studentACTFee = 4.60; double parkingFee = 2.00; double tuition = 180.40; double capitalFee1 = 0.00; double capitalFee2 = 21.00; double perCreditR = 187.00; double perCreditV = 187.00; double perCreditD = 187.00; double perCreditM = 208.00; double perCreditB = 268.00; double perCreditO = 387.25; Scanner input = new Scanner(System.in); //Asking user for NameSystem.out.println("Welcome to the NOVA Tuition and Fees Calculator.");System.out.println("Please enter your name: ");name= input.nextLine();//Ask user to choose option System.out.println("Please enter the type of student that your are from the choices below:\n" + "R for Virginia Resident\r\n" + "M for Military Contract Out-of-State\r\n" + "V for Military Veterans and Dependents\r\n" + "D for Dual Enrolled\r\n" + "B for Business Contract Students\r\n" + "O for Out of State Students\r\n"); studentType = input.nextLine();if (studentType.equalsIgnoreCase("R")) { System.out.println("Please enter the number of credits that you are taking:"); creditNumber = input.nextInt();如果積分數(shù)超過 18，我希望我的程序重新啟動 if 語句。因此，如果我輸入 19，它會說重新輸入積分并重新開始 if 語句。
3 回答
ibeautiful
TA貢獻1993條經(jīng)驗 獲得超6個贊
您可以嘗試將您的if語句包裝在一個do-while循環(huán)中：
if (studentType.equalsIgnoreCase("R"))
{
do{
System.out.println("Please enter the number of credits that you are taking:");
creditNumber = input.nextInt();
if (creditNumber <= 18)
{
System.out.println("Tuition and fees report for " + name);
System.out.println("Tuition: "+ tuition);
System.out.println( "Capital Fee: \t"+ capitalFee1);
System.out.println( "Student Activities Fee: \t "+ studentACTFee);
System.out.println( "Parking Infrastructure Fee: \t " + parkingFee);
System.out.println("Tuition & Fees Per Credit: " + perCreditR);
System.out.println("X Number of Credits: " + creditNumber);
totalTF = creditNumber * perCreditR;
System.out.println("Total Tuition and Fees: \t" + totalTF);
System.out.println("Bodly NOVA");
}
else {System.out.println("Please re-enter credit Number ");}
}while(creditNumber > 18);
}
慕姐8265434
TA貢獻1813條經(jīng)驗 獲得超2個贊
那么我可以建議你重新考慮設計。但這不是你的問題——對吧？所以，如果你真的想要，你所要求的，這里就是一個休息（“窮人例外”）：
exitpoint:{
//your code ...
break exitpoint;
//more code
break exitpoint;
//....
}
或有一些循環(huán)：
exitpoint:
while( ){
// code....
for(;;){
//...
break exitpoint;
}
}
處理錯誤（如錯誤的用戶輸入）的更好方法是異常。但這也不是問題——是嗎？
嚕嚕噠
TA貢獻1784條經(jīng)驗 獲得超7個贊
我會做這樣的事情：
if (studentType.equalsIgnoreCase("R"))
{
System.out.println("Please enter the number of credits that you are
taking:");
creditNumber = input.nextInt();
while(creditNumber > 18)
{
System.out.println("Please re-enter the number of credits that you are
taking:");
creditNumber = input.nextInt();
}
System.out.println("Tuition and fees report for " + name);
System.out.println("Tuition: "+ tuition);
System.out.println( "Capital Fee: \t"+ capitalFee1);
System.out.println( "Student Activities Fee: \t "+ studentACTFee);
System.out.println( "Parking Infrastructure Fee: \t " + parkingFee);
System.out.println("Tuition & Fees Per Credit: " + perCreditR);
System.out.println("X Number of Credits: " + creditNumber);
totalTF = creditNumber * perCreditR;
System.out.println("Total Tuition and Fees: \t" + totalTF);
System.out.println("Bodly NOVA");
}
這使用了一個 while() 語句來檢查初始 creditNumber 是否大于 18 并不斷地重新提示用戶進行新輸入。然后，一旦它們提供小于或等于 18 的值，它就會執(zhí)行您希望它執(zhí)行的所有其他操作。請注意，我沒有對此進行測試，但它應該可以工作。
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