Java if ... else聲明不能正常工作

Question

public double transferSavingToChecking(double Tamount2) 
{ 
    //check if enough to transfer 
    if(Tamount2 > Saving_Balance) 
     System.out.println("Transfer failed. You don't have enough  balance in the saving account!"); 
    else 
     System.out.println("You have successfully transferred $" + Tamount2 + " from the saving account to the checking account"); 
     Saving_Balance = Saving_Balance - Tamount2; 
     Checking_Balance = Checking_Balance + Tamount2; 

    return Checking_Balance; 
} 

當貨幣轉移時，if...else聲明每次都會運行。例如，即使當transfer > balance時，輸出反映出即使它說它失敗也發生了轉移。

Answer 1

您需要在if/else塊的內容周圍放置花括號。 if/else語句寫在下面的方法：

if (condition) { 
    // do something 
} else { 
    // do something else 
} 

如果你錯過了大括號，只有第一個語句的if/else塊的if/else被認爲是部分之後。那麼

public double transferSavingToChecking(double Tamount2) { 
    //check if enough to transfer 
    if(Tamount2 > Saving_Balance) { 
     System.out.println("Transfer failed. You don't have enough  balance in the saving account!"); 
    } else { 
     System.out.println("You have successfully transferred $" +  Tamount2 + " from the saving account to the checking account"); 
     Saving_Balance=Saving_Balance - Tamount2; 
     Checking_Balance=Checking_Balance + Tamount2; 
    } 
    return Checking_Balance; 
}