是否可以在一行代码中执行两种不同的“+=”和“-=”操作？

Question

我刚开始自学 java 我想知道是否有一个操作（可能是 "and then" 操作）可以让我在同一行上执行两个数学计算。保持 "balance" 的更新总数很重要。这是我的代码：

public static void main(String[] args) {
  double balance = 5400d;
  double withdrawalAmount = 2100d;
  double depositAmount = 1100d;

  //Total Balance after primary transactions 
  // (This line of code works but I want to update "balance" after every calculation
  System.out.println(balance - withdrawalAmount + depositAmount); 

  //This updates the balance after withdrawing money    
  System.out.println(balance -= withdrawalAmount);

  //This updates balance after depositing money    
  System.out.println(balance += depositAmount);

  //Here is where I was trying to combine both operations but it did not like this very much    
  System.out.println(balance -= withdrawalAmount && balance += depositAmount);
  }

Answer 1

没有 Java 语法可以做到这一点，但您仍然可以使用简单的数学运算来做到这一点。

您想做的事情：

X = X  - y + z

这里不需要两个作业。您只需减去一个值并添加另一个值，然后再对 X 执行单个赋值。

Answer 2

您只需一行即可完成：

System.out.println(balance = balance - withdrawalAmount + depositAmount);

是否可以在一行代码中执行两种不同的“+=”和“-=”操作？

Is it possible to perform two different "+=" and "-=" operations in one line of code?

java

math

operation