在Java中为变量分配新值 [英] Assigning New Values to Variables in Java

问题描述

我是Java新手，对变量有疑问.这是一个例子.

I am new to Java, and have a question about variables. Here is an example.

int hello = 6;
int goodbye = 7;
int combined = hello + goodbye;

    System.out.println(combined);
    hello = 10;
    System.out.println(combined);

当我重新分配问候，并为其指定10而不是6的值时，我第二次打印合并，它仍说合并等于13，而不是控制台中的17.您如何解决?谢谢！

When I reassign hello, and give it the value of 10 instead of six, and I print combined the second time, it still says combined is equal to 13, not 17 in the console. How do you fix that? Thank You!

推荐答案

combined 不会改变，只是因为确定它的变量之一发生了变化.您每次都需要手动更新 combined .

combined won't changed just because one of the variables determining it changed. You'll need to manually update combined every time.

对于这种简单的情况，最简单的方法就是再次编写 hello +再见，如@lealceldeiro的答案所示.

For this simple case, the simplest way would just be to write hello + goodbye again as shown in @lealceldeiro's answer.

但是对于更复杂的代码，与其将相同的代码复制到多个位置，不如将其包装在一个函数中会更好:

For more complicated bits of code though, instead of duplicating the same code multiple places, it would be better to wrap that code in a function:

public int doSomeMath(int x, int y) {
    return x + y; //Pretend this is some complicated equation 
}

然后，当您需要多次进行数学运算时，可以使用以下函数:

Then, when you need to do the math later multiple times, you use the function:

int hello = 6;
int goodbye = 7;

// Prints 13
System.out.println(doSomeMath(hello, goodbye));

goodbye = 10;

//Prints 17 
System.out.println(doSomeMath(hello, goodbye));

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